Adding upstream version 2.4.1.upstream/2.4.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

28 files changed, 20037 insertions, 0 deletions

diff --git a/src/hooks/dhcp/mysql_cb/Makefile.am b/src/hooks/dhcp/mysql_cb/Makefile.am
new file mode 100644
index 0000000..1263a3d
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/Makefile.am
@@ -0,0 +1,88 @@
+SUBDIRS = . tests libloadtests
+
+AM_CPPFLAGS  = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES) $(MYSQL_CPPFLAGS)
+AM_CXXFLAGS  = $(KEA_CXXFLAGS)
+
+# Ensure that the message file is included in the distribution
+EXTRA_DIST = mysql_cb_messages.mes
+
+CLEANFILES = *.gcno *.gcda
+
+# convenience archive
+
+noinst_LTLIBRARIES = libmysqlcb.la
+
+libmysqlcb_la_SOURCES  = mysql_cb_callouts.cc
+libmysqlcb_la_SOURCES += mysql_cb_dhcp4.cc mysql_cb_dhcp4.h
+libmysqlcb_la_SOURCES += mysql_cb_dhcp6.cc mysql_cb_dhcp6.h
+libmysqlcb_la_SOURCES += mysql_cb_impl.cc mysql_cb_impl.h
+libmysqlcb_la_SOURCES += mysql_cb_messages.cc mysql_cb_messages.h
+libmysqlcb_la_SOURCES += mysql_cb_log.cc mysql_cb_log.h
+libmysqlcb_la_SOURCES += mysql_query_macros_dhcp.h
+libmysqlcb_la_SOURCES += version.cc
+
+libmysqlcb_la_CXXFLAGS = $(AM_CXXFLAGS)
+libmysqlcb_la_CPPFLAGS = $(AM_CPPFLAGS)
+
+# install the shared object into $(libdir)/kea/hooks
+lib_hooksdir = $(libdir)/kea/hooks
+lib_hooks_LTLIBRARIES = libdhcp_mysql_cb.la
+
+libdhcp_mysql_cb_la_SOURCES  =
+libdhcp_mysql_cb_la_LDFLAGS  = $(AM_LDFLAGS) $(MYSQL_LIBS)
+libdhcp_mysql_cb_la_LDFLAGS  += -avoid-version -export-dynamic -module
+
+libdhcp_mysql_cb_la_LIBADD  = libmysqlcb.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/dhcpsrv/libkea-dhcpsrv.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/process/libkea-process.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/eval/libkea-eval.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/dhcp_ddns/libkea-dhcp_ddns.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/stats/libkea-stats.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/config/libkea-cfgclient.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/http/libkea-http.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/mysql/libkea-mysql.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/database/libkea-database.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/log/libkea-log.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/util/libkea-util.la
+libdhcp_mysql_cb_la_LIBADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+
+# If we want to get rid of all generated messages files, we need to use
+# make maintainer-clean. The proper way to introduce custom commands for
+# that operation is to define maintainer-clean-local target. However,
+# make maintainer-clean also removes Makefile, so running configure script
+# is required.  To make it easy to rebuild messages without going through
+# reconfigure, a new target messages-clean has been added.
+maintainer-clean-local:
+	rm -f mysql_cb_messages.h mysql_cb_messages.cc
+
+# To regenerate messages files, one can do:
+#
+# make messages-clean
+# make messages
+#
+# This is needed only when a .mes file is modified.
+messages-clean: maintainer-clean-local
+
+if GENERATE_MESSAGES
+
+# Define rule to build logging source files from message file
+messages: mysql_cb_messages.h mysql_cb_messages.cc
+	@echo Message files regenerated
+
+mysql_cb_messages.h mysql_cb_messages.cc: mysql_cb_messages.mes
+	$(top_builddir)/src/lib/log/compiler/kea-msg-compiler $(top_srcdir)/src/hooks/dhcp/mysql_cb/mysql_cb_messages.mes
+
+else
+
+messages mysql_cb_messages.h mysql_cb_messages.cc:
+	@echo Messages generation disabled. Configure with --enable-generate-messages to enable it.
+
+endif
+
diff --git a/src/hooks/dhcp/mysql_cb/Makefile.in b/src/hooks/dhcp/mysql_cb/Makefile.in
new file mode 100644
index 0000000..733f7ac
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/Makefile.in
@@ -0,0 +1,1085 @@
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+DISTCHECK_GSSAPI_CONFIGURE_FLAG = @DISTCHECK_GSSAPI_CONFIGURE_FLAG@
+DISTCHECK_GTEST_CONFIGURE_FLAG = @DISTCHECK_GTEST_CONFIGURE_FLAG@
+DISTCHECK_KEA_SHELL_CONFIGURE_FLAG = @DISTCHECK_KEA_SHELL_CONFIGURE_FLAG@
+DISTCHECK_LIBYANGCPP_CONFIGURE_FLAG = @DISTCHECK_LIBYANGCPP_CONFIGURE_FLAG@
+DISTCHECK_LIBYANG_CONFIGURE_FLAG = @DISTCHECK_LIBYANG_CONFIGURE_FLAG@
+DISTCHECK_LOG4CPLUS_CONFIGURE_FLAG = @DISTCHECK_LOG4CPLUS_CONFIGURE_FLAG@
+DISTCHECK_MYSQL_CONFIGURE_FLAG = @DISTCHECK_MYSQL_CONFIGURE_FLAG@
+DISTCHECK_PERFDHCP_CONFIGURE_FLAG = @DISTCHECK_PERFDHCP_CONFIGURE_FLAG@
+DISTCHECK_PGSQL_CONFIGURE_FLAG = @DISTCHECK_PGSQL_CONFIGURE_FLAG@
+DISTCHECK_PREMIUM_CONFIGURE_FLAG = @DISTCHECK_PREMIUM_CONFIGURE_FLAG@
+DISTCHECK_SYSREPOCPP_CONFIGURE_FLAG = @DISTCHECK_SYSREPOCPP_CONFIGURE_FLAG@
+DISTCHECK_SYSREPO_CONFIGURE_FLAG = @DISTCHECK_SYSREPO_CONFIGURE_FLAG@
+DLLTOOL = @DLLTOOL@
+DSYMUTIL = @DSYMUTIL@
+DUMPBIN = @DUMPBIN@
+ECHO_C = @ECHO_C@
+ECHO_N = @ECHO_N@
+ECHO_T = @ECHO_T@
+EGREP = @EGREP@
+EXEEXT = @EXEEXT@
+FGREP = @FGREP@
+GENHTML = @GENHTML@
+GREP = @GREP@
+GSSAPI_CFLAGS = @GSSAPI_CFLAGS@
+GSSAPI_LIBS = @GSSAPI_LIBS@
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+GTEST_INCLUDES = @GTEST_INCLUDES@
+GTEST_LDADD = @GTEST_LDADD@
+GTEST_LDFLAGS = @GTEST_LDFLAGS@
+GTEST_SOURCE = @GTEST_SOURCE@
+HAVE_NETCONF = @HAVE_NETCONF@
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+INSTALL_DATA = @INSTALL_DATA@
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+INSTALL_SCRIPT = @INSTALL_SCRIPT@
+INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
+KEA_CXXFLAGS = @KEA_CXXFLAGS@
+KEA_SRCID = @KEA_SRCID@
+KRB5_CONFIG = @KRB5_CONFIG@
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+LDFLAGS = @LDFLAGS@
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+LIBYANGCPP_CPPFLAGS = @LIBYANGCPP_CPPFLAGS@
+LIBYANGCPP_INCLUDEDIR = @LIBYANGCPP_INCLUDEDIR@
+LIBYANGCPP_LIBS = @LIBYANGCPP_LIBS@
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+LIBYANGCPP_VERSION = @LIBYANGCPP_VERSION@
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+WARNING_GCC_44_STRICT_ALIASING_CFLAG = @WARNING_GCC_44_STRICT_ALIASING_CFLAG@
+YACC = @YACC@
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+psdir = @psdir@
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+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+SUBDIRS = . tests libloadtests
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib \
+	$(BOOST_INCLUDES) $(MYSQL_CPPFLAGS)
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+# Ensure that the message file is included in the distribution
+EXTRA_DIST = mysql_cb_messages.mes
+CLEANFILES = *.gcno *.gcda
+
+# convenience archive
+noinst_LTLIBRARIES = libmysqlcb.la
+libmysqlcb_la_SOURCES = mysql_cb_callouts.cc mysql_cb_dhcp4.cc \
+	mysql_cb_dhcp4.h mysql_cb_dhcp6.cc mysql_cb_dhcp6.h \
+	mysql_cb_impl.cc mysql_cb_impl.h mysql_cb_messages.cc \
+	mysql_cb_messages.h mysql_cb_log.cc mysql_cb_log.h \
+	mysql_query_macros_dhcp.h version.cc
+libmysqlcb_la_CXXFLAGS = $(AM_CXXFLAGS)
+libmysqlcb_la_CPPFLAGS = $(AM_CPPFLAGS)
+
+# install the shared object into $(libdir)/kea/hooks
+lib_hooksdir = $(libdir)/kea/hooks
+lib_hooks_LTLIBRARIES = libdhcp_mysql_cb.la
+libdhcp_mysql_cb_la_SOURCES = 
+libdhcp_mysql_cb_la_LDFLAGS = $(AM_LDFLAGS) $(MYSQL_LIBS) \
+	-avoid-version -export-dynamic -module
+libdhcp_mysql_cb_la_LIBADD = libmysqlcb.la \
+	$(top_builddir)/src/lib/dhcpsrv/libkea-dhcpsrv.la \
+	$(top_builddir)/src/lib/process/libkea-process.la \
+	$(top_builddir)/src/lib/eval/libkea-eval.la \
+	$(top_builddir)/src/lib/dhcp_ddns/libkea-dhcp_ddns.la \
+	$(top_builddir)/src/lib/stats/libkea-stats.la \
+	$(top_builddir)/src/lib/config/libkea-cfgclient.la \
+	$(top_builddir)/src/lib/http/libkea-http.la \
+	$(top_builddir)/src/lib/dhcp/libkea-dhcp++.la \
+	$(top_builddir)/src/lib/hooks/libkea-hooks.la \
+	$(top_builddir)/src/lib/mysql/libkea-mysql.la \
+	$(top_builddir)/src/lib/database/libkea-database.la \
+	$(top_builddir)/src/lib/cc/libkea-cc.la \
+	$(top_builddir)/src/lib/asiolink/libkea-asiolink.la \
+	$(top_builddir)/src/lib/dns/libkea-dns++.la \
+	$(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la \
+	$(top_builddir)/src/lib/log/libkea-log.la \
+	$(top_builddir)/src/lib/util/libkea-util.la \
+	$(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+all: all-recursive
+
+.SUFFIXES:
+.SUFFIXES: .cc .lo .o .obj
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/hooks/dhcp/mysql_cb/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/hooks/dhcp/mysql_cb/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+install-lib_hooksLTLIBRARIES: $(lib_hooks_LTLIBRARIES)
+	@$(NORMAL_INSTALL)
+	@list='$(lib_hooks_LTLIBRARIES)'; test -n "$(lib_hooksdir)" || list=; \
+	list2=; for p in $$list; do \
+	  if test -f $$p; then \
+	    list2="$$list2 $$p"; \
+	  else :; fi; \
+	done; \
+	test -z "$$list2" || { \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(lib_hooksdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(lib_hooksdir)" || exit 1; \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 '$(DESTDIR)$(lib_hooksdir)'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 "$(DESTDIR)$(lib_hooksdir)"; \
+	}
+
+uninstall-lib_hooksLTLIBRARIES:
+	@$(NORMAL_UNINSTALL)
+	@list='$(lib_hooks_LTLIBRARIES)'; test -n "$(lib_hooksdir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(lib_hooksdir)/$$f'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(lib_hooksdir)/$$f"; \
+	done
+
+clean-lib_hooksLTLIBRARIES:
+	-test -z "$(lib_hooks_LTLIBRARIES)" || rm -f $(lib_hooks_LTLIBRARIES)
+	@list='$(lib_hooks_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+clean-noinstLTLIBRARIES:
+	-test -z "$(noinst_LTLIBRARIES)" || rm -f $(noinst_LTLIBRARIES)
+	@list='$(noinst_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libdhcp_mysql_cb.la: $(libdhcp_mysql_cb_la_OBJECTS) $(libdhcp_mysql_cb_la_DEPENDENCIES) $(EXTRA_libdhcp_mysql_cb_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(libdhcp_mysql_cb_la_LINK) -rpath $(lib_hooksdir) $(libdhcp_mysql_cb_la_OBJECTS) $(libdhcp_mysql_cb_la_LIBADD) $(LIBS)
+
+libmysqlcb.la: $(libmysqlcb_la_OBJECTS) $(libmysqlcb_la_DEPENDENCIES) $(EXTRA_libmysqlcb_la_DEPENDENCIES) 
+	$(AM_V_CXXLD)$(libmysqlcb_la_LINK)  $(libmysqlcb_la_OBJECTS) $(libmysqlcb_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libmysqlcb_la-mysql_cb_callouts.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libmysqlcb_la-mysql_cb_dhcp4.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libmysqlcb_la-mysql_cb_dhcp6.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libmysqlcb_la-mysql_cb_impl.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libmysqlcb_la-mysql_cb_log.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libmysqlcb_la-mysql_cb_messages.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libmysqlcb_la-version.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.cc.o:
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXXCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	DEPDIR=$(DEPDIR) $(CXXDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(CXXCOMPILE) -c -o $@ $<
+
+.cc.obj:
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXXCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	DEPDIR=$(DEPDIR) $(CXXDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(CXXCOMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
+
+.cc.lo:
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(LTCXXCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
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+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(LTCXXCOMPILE) -c -o $@ $<
+
+libmysqlcb_la-mysql_cb_callouts.lo: mysql_cb_callouts.cc
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmysqlcb_la_CPPFLAGS) $(CPPFLAGS) $(libmysqlcb_la_CXXFLAGS) $(CXXFLAGS) -MT libmysqlcb_la-mysql_cb_callouts.lo -MD -MP -MF $(DEPDIR)/libmysqlcb_la-mysql_cb_callouts.Tpo -c -o libmysqlcb_la-mysql_cb_callouts.lo `test -f 'mysql_cb_callouts.cc' || echo '$(srcdir)/'`mysql_cb_callouts.cc
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libmysqlcb_la-mysql_cb_callouts.Tpo $(DEPDIR)/libmysqlcb_la-mysql_cb_callouts.Plo
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='mysql_cb_callouts.cc' object='libmysqlcb_la-mysql_cb_callouts.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	DEPDIR=$(DEPDIR) $(CXXDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmysqlcb_la_CPPFLAGS) $(CPPFLAGS) $(libmysqlcb_la_CXXFLAGS) $(CXXFLAGS) -c -o libmysqlcb_la-mysql_cb_callouts.lo `test -f 'mysql_cb_callouts.cc' || echo '$(srcdir)/'`mysql_cb_callouts.cc
+
+libmysqlcb_la-mysql_cb_dhcp4.lo: mysql_cb_dhcp4.cc
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmysqlcb_la_CPPFLAGS) $(CPPFLAGS) $(libmysqlcb_la_CXXFLAGS) $(CXXFLAGS) -MT libmysqlcb_la-mysql_cb_dhcp4.lo -MD -MP -MF $(DEPDIR)/libmysqlcb_la-mysql_cb_dhcp4.Tpo -c -o libmysqlcb_la-mysql_cb_dhcp4.lo `test -f 'mysql_cb_dhcp4.cc' || echo '$(srcdir)/'`mysql_cb_dhcp4.cc
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libmysqlcb_la-mysql_cb_dhcp4.Tpo $(DEPDIR)/libmysqlcb_la-mysql_cb_dhcp4.Plo
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='mysql_cb_dhcp4.cc' object='libmysqlcb_la-mysql_cb_dhcp4.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	DEPDIR=$(DEPDIR) $(CXXDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmysqlcb_la_CPPFLAGS) $(CPPFLAGS) $(libmysqlcb_la_CXXFLAGS) $(CXXFLAGS) -c -o libmysqlcb_la-mysql_cb_dhcp4.lo `test -f 'mysql_cb_dhcp4.cc' || echo '$(srcdir)/'`mysql_cb_dhcp4.cc
+
+libmysqlcb_la-mysql_cb_dhcp6.lo: mysql_cb_dhcp6.cc
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmysqlcb_la_CPPFLAGS) $(CPPFLAGS) $(libmysqlcb_la_CXXFLAGS) $(CXXFLAGS) -MT libmysqlcb_la-mysql_cb_dhcp6.lo -MD -MP -MF $(DEPDIR)/libmysqlcb_la-mysql_cb_dhcp6.Tpo -c -o libmysqlcb_la-mysql_cb_dhcp6.lo `test -f 'mysql_cb_dhcp6.cc' || echo '$(srcdir)/'`mysql_cb_dhcp6.cc
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libmysqlcb_la-mysql_cb_dhcp6.Tpo $(DEPDIR)/libmysqlcb_la-mysql_cb_dhcp6.Plo
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+mostlyclean-generic:
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+clean-generic:
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+
+distclean-generic:
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+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+distclean: distclean-recursive
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+	-rm -f ./$(DEPDIR)/libmysqlcb_la-mysql_cb_impl.Plo
+	-rm -f ./$(DEPDIR)/libmysqlcb_la-mysql_cb_log.Plo
+	-rm -f ./$(DEPDIR)/libmysqlcb_la-mysql_cb_messages.Plo
+	-rm -f ./$(DEPDIR)/libmysqlcb_la-version.Plo
+	-rm -f Makefile
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+	maintainer-clean-local
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+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am \
+	install-lib_hooksLTLIBRARIES install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs installdirs-am \
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+	uninstall-lib_hooksLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+
+# If we want to get rid of all generated messages files, we need to use
+# make maintainer-clean. The proper way to introduce custom commands for
+# that operation is to define maintainer-clean-local target. However,
+# make maintainer-clean also removes Makefile, so running configure script
+# is required.  To make it easy to rebuild messages without going through
+# reconfigure, a new target messages-clean has been added.
+maintainer-clean-local:
+	rm -f mysql_cb_messages.h mysql_cb_messages.cc
+
+# To regenerate messages files, one can do:
+#
+# make messages-clean
+# make messages
+#
+# This is needed only when a .mes file is modified.
+messages-clean: maintainer-clean-local
+
+# Define rule to build logging source files from message file
+@GENERATE_MESSAGES_TRUE@messages: mysql_cb_messages.h mysql_cb_messages.cc
+@GENERATE_MESSAGES_TRUE@	@echo Message files regenerated
+
+@GENERATE_MESSAGES_TRUE@mysql_cb_messages.h mysql_cb_messages.cc: mysql_cb_messages.mes
+@GENERATE_MESSAGES_TRUE@	$(top_builddir)/src/lib/log/compiler/kea-msg-compiler $(top_srcdir)/src/hooks/dhcp/mysql_cb/mysql_cb_messages.mes
+
+@GENERATE_MESSAGES_FALSE@messages mysql_cb_messages.h mysql_cb_messages.cc:
+@GENERATE_MESSAGES_FALSE@	@echo Messages generation disabled. Configure with --enable-generate-messages to enable it.
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/hooks/dhcp/mysql_cb/libloadtests/Makefile.am b/src/hooks/dhcp/mysql_cb/libloadtests/Makefile.am
new file mode 100644
index 0000000..391c1ec
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/libloadtests/Makefile.am
@@ -0,0 +1,56 @@
+SUBDIRS = .
+
+AM_CPPFLAGS  = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += -I$(top_builddir)/src/hooks/dhcp/mysql_cb -I$(top_srcdir)/src/hooks/dhcp/mysql_cb
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CPPFLAGS += -DLIBDHCP_MYSQL_CB_SO=\"$(abs_top_builddir)/src/hooks/dhcp/mysql_cb/.libs/libdhcp_mysql_cb.so\"
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+EXTRA_DIST =
+
+CLEANFILES = *.gcno *.gcda
+
+TESTS_ENVIRONMENT = \
+	$(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+if HAVE_GTEST
+
+TESTS = hook_load_unittests
+
+hook_load_unittests_SOURCES  =
+hook_load_unittests_SOURCES += load_unload_unittests.cc
+hook_load_unittests_SOURCES += run_unittests.cc
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+
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+hook_load_unittests_LDADD += $(top_builddir)/src/lib/process/libkea-process.la
+hook_load_unittests_LDADD += $(top_builddir)/src/lib/eval/libkea-eval.la
+hook_load_unittests_LDADD += $(top_builddir)/src/lib/dhcp_ddns/libkea-dhcp_ddns.la
+hook_load_unittests_LDADD += $(top_builddir)/src/lib/stats/libkea-stats.la
+hook_load_unittests_LDADD += $(top_builddir)/src/lib/config/libkea-cfgclient.la
+hook_load_unittests_LDADD += $(top_builddir)/src/lib/http/libkea-http.la
+hook_load_unittests_LDADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+hook_load_unittests_LDADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
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index 0000000..5c6177f
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+	      skipped="($$skip test was not run)"; \
+	    else \
+	      skipped="($$skip tests were not run)"; \
+	    fi; \
+	    test `echo "$$skipped" | wc -c` -le `echo "$$banner" | wc -c` || \
+	      dashes="$$skipped"; \
+	  fi; \
+	  report=""; \
+	  if test "$$failed" -ne 0 && test -n "$(PACKAGE_BUGREPORT)"; then \
+	    report="Please report to $(PACKAGE_BUGREPORT)"; \
+	    test `echo "$$report" | wc -c` -le `echo "$$banner" | wc -c` || \
+	      dashes="$$report"; \
+	  fi; \
+	  dashes=`echo "$$dashes" | sed s/./=/g`; \
+	  if test "$$failed" -eq 0; then \
+	    col="$$grn"; \
+	  else \
+	    col="$$red"; \
+	  fi; \
+	  echo "$${col}$$dashes$${std}"; \
+	  echo "$${col}$$banner$${std}"; \
+	  test -z "$$skipped" || echo "$${col}$$skipped$${std}"; \
+	  test -z "$$report" || echo "$${col}$$report$${std}"; \
+	  echo "$${col}$$dashes$${std}"; \
+	  test "$$failed" -eq 0; \
+	else :; fi
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-recursive
+all-am: Makefile $(PROGRAMS)
+installdirs: installdirs-recursive
+installdirs-am:
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/hook_load_unittests-load_unload_unittests.Po
+	-rm -f ./$(DEPDIR)/hook_load_unittests-run_unittests.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
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+info-am:
+
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+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/hook_load_unittests-load_unload_unittests.Po
+	-rm -f ./$(DEPDIR)/hook_load_unittests-run_unittests.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: $(am__recursive_targets) check-am install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-TESTS check-am clean clean-generic \
+	clean-libtool clean-noinstPROGRAMS cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/hooks/dhcp/mysql_cb/libloadtests/load_unload_unittests.cc b/src/hooks/dhcp/mysql_cb/libloadtests/load_unload_unittests.cc
new file mode 100644
index 0000000..89102fa
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/libloadtests/load_unload_unittests.cc
@@ -0,0 +1,64 @@
+// Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/// @file This file contains tests which exercise the load and unload
+/// functions in the ddns tuning hook library. In order to test the load
+/// function, one must be able to pass it hook library parameters. The
+/// the only way to populate these parameters is by actually loading the
+/// library via HooksManager::loadLibraries().
+
+#include <config.h>
+
+#include <cc/data.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <hooks/hooks_manager.h>
+#include <process/daemon.h>
+#include <testutils/gtest_utils.h>
+#include <testutils/lib_load_test_fixture.h>
+
+#include <gtest/gtest.h>
+#include <errno.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::hooks;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::process;
+
+namespace {
+
+/// @brief Test fixture for testing loading and unloading the MySQL cb library
+class MySqlCbLibLoadTest : public isc::test::LibLoadTest {
+public:
+    /// @brief Constructor
+    MySqlCbLibLoadTest() : LibLoadTest(LIBDHCP_MYSQL_CB_SO) {
+    }
+
+    /// @brief Destructor
+    virtual ~MySqlCbLibLoadTest() {
+        unloadLibraries();
+    }
+};
+
+// Simple V4 test that checks the library can be loaded and unloaded several times.
+TEST_F(MySqlCbLibLoadTest, validLoad4) {
+    validDaemonTest("kea-dhcp4");
+}
+
+// Simple V6 test that checks the library can be loaded and unloaded several times.
+TEST_F(MySqlCbLibLoadTest, validLoad6) {
+    validDaemonTest("kea-dhcp6", AF_INET6);
+}
+
+// Simple V6 test that checks the library cannot by loaded by invalid daemons.
+TEST_F(MySqlCbLibLoadTest, invalidDaemonLoad) {
+    invalidDaemonTest("kea-ctrl-agent");
+    invalidDaemonTest("kea-dhcp-ddns");
+    invalidDaemonTest("bogus");
+}
+
+} // end of anonymous namespace
diff --git a/src/hooks/dhcp/mysql_cb/libloadtests/run_unittests.cc b/src/hooks/dhcp/mysql_cb/libloadtests/run_unittests.cc
new file mode 100644
index 0000000..d9e195d
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/libloadtests/run_unittests.cc
@@ -0,0 +1,20 @@
+// Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the End User License
+// Agreement. See COPYING file in the premium/ directory.
+
+#include <config.h>
+
+#include <log/logger_support.h>
+
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+    isc::log::initLogger();
+
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_callouts.cc b/src/hooks/dhcp/mysql_cb/mysql_cb_callouts.cc
new file mode 100644
index 0000000..c047f42
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_callouts.cc
@@ -0,0 +1,122 @@
+// Copyright (C) 2018-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// Functions accessed by the hooks framework use C linkage to avoid the name
+// mangling that accompanies use of the C++ compiler as well as to avoid
+// issues related to namespaces.
+
+#include <config.h>
+
+#include <dhcpsrv/cfgmgr.h>
+#include <hooks/hooks.h>
+#include <process/daemon.h>
+#include <mysql_cb_impl.h>
+
+#include <mysql_cb_dhcp4.h>
+#include <mysql_cb_dhcp6.h>
+#include <mysql_cb_log.h>
+
+#include <sstream>
+#include <string>
+
+using namespace isc::cb;
+using namespace isc::dhcp;
+using namespace isc::hooks;
+using namespace isc::log;
+using namespace isc::process;
+using namespace std;
+
+extern "C" {
+
+/// @brief This function is called when the library is loaded.
+///
+/// @param handle library handle
+/// @return 0 when initialization is successful, 1 otherwise
+
+int load(LibraryHandle& /* handle */) {
+    // Make the hook library not loadable by d2 or ca.
+    uint16_t family = CfgMgr::instance().getFamily();
+    const std::string& proc_name = Daemon::getProcName();
+    if (family == AF_INET) {
+        if (proc_name != "kea-dhcp4") {
+            isc_throw(isc::Unexpected, "Bad process name: " << proc_name
+                      << ", expected kea-dhcp4");
+        }
+    } else {
+        if (proc_name != "kea-dhcp6") {
+            isc_throw(isc::Unexpected, "Bad process name: " << proc_name
+                      << ", expected kea-dhcp6");
+        }
+    }
+
+    LOG_INFO(mysql_cb_logger, MYSQL_CB_INIT_OK);
+    // Register MySQL CB factories with CB Managers
+    isc::dhcp::MySqlConfigBackendDHCPv4::registerBackendType();
+    isc::dhcp::MySqlConfigBackendDHCPv6::registerBackendType();
+
+    return (0);
+}
+
+/// @brief This function is called by the DHCPv4 server when it is configured.
+///
+/// The only purpose of this callout is to retrieve io_service_ reference.
+///
+/// @param handle callout handle passed to the callout.
+/// @return 0 on success, 1 otherwise.
+int dhcp4_srv_configured(CalloutHandle& handle) {
+    isc::asiolink::IOServicePtr io_service;
+    handle.getArgument("io_context", io_service);
+    if (!io_service) {
+        const string error("Error: io_context is null");
+        handle.setArgument("error", error);
+        handle.setStatus(isc::hooks::CalloutHandle::NEXT_STEP_DROP);
+        return (1);
+    }
+    isc::dhcp::MySqlConfigBackendImpl::setIOService(io_service);
+    return (0);
+}
+
+/// @brief This function is called by the DHCPv6 server when it is configured.
+///
+/// The only purpose of this callout is to retrieve io_service_ reference.
+///
+/// @param handle callout handle passed to the callout.
+/// @return 0 on success, 1 otherwise.
+int dhcp6_srv_configured(CalloutHandle& handle) {
+    isc::asiolink::IOServicePtr io_service;
+    handle.getArgument("io_context", io_service);
+    if (!io_service) {
+        const string error("Error: io_context is null");
+        handle.setArgument("error", error);
+        handle.setStatus(isc::hooks::CalloutHandle::NEXT_STEP_DROP);
+        return (1);
+    }
+    isc::dhcp::MySqlConfigBackendImpl::setIOService(io_service);
+    return (0);
+}
+
+/// @brief This function is called when the library is unloaded.
+///
+/// @return 0 if deregistration was successful, 1 otherwise
+int unload() {
+    LOG_INFO(mysql_cb_logger, MYSQL_CB_DEINIT_OK);
+    // Unregister the factories and remove MySQL backends
+    isc::dhcp::MySqlConfigBackendDHCPv4::unregisterBackendType();
+    isc::dhcp::MySqlConfigBackendDHCPv6::unregisterBackendType();
+    return (0);
+}
+
+/// @brief This function is called to retrieve the multi-threading compatibility.
+///
+/// @note: the compatibility is based on the assumption this hook library
+/// is always called from the main thread.
+///
+/// @return 1 which means compatible with multi-threading.
+int multi_threading_compatible() {
+    return (1);
+}
+
+} // end extern "C"
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp4.cc b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp4.cc
new file mode 100644
index 0000000..76a7fe4
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp4.cc
@@ -0,0 +1,4358 @@
+// Copyright (C) 2018-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <mysql_cb_dhcp4.h>
+#include <mysql_cb_impl.h>
+#include <mysql_query_macros_dhcp.h>
+#include <cc/data.h>
+#include <config_backend/constants.h>
+#include <database/database_connection.h>
+#include <database/db_exceptions.h>
+#include <dhcp/classify.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/libdhcp++.h>
+#include <dhcp/option_data_types.h>
+#include <dhcp/option_space.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <dhcpsrv/config_backend_dhcp4_mgr.h>
+#include <dhcpsrv/network.h>
+#include <dhcpsrv/pool.h>
+#include <dhcpsrv/lease.h>
+#include <dhcpsrv/timer_mgr.h>
+#include <dhcpsrv/parsers/client_class_def_parser.h>
+#include <util/buffer.h>
+#include <util/boost_time_utils.h>
+#include <util/multi_threading_mgr.h>
+#include <mysql/mysql_connection.h>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/lexical_cast.hpp>
+#include <boost/pointer_cast.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <mysql.h>
+#include <mysqld_error.h>
+#include <array>
+#include <sstream>
+#include <utility>
+#include <vector>
+
+using namespace isc::cb;
+using namespace isc::db;
+using namespace isc::data;
+using namespace isc::asiolink;
+using namespace isc::log;
+using namespace isc::util;
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Implementation of the MySQL Configuration Backend.
+class MySqlConfigBackendDHCPv4Impl : public MySqlConfigBackendImpl {
+public:
+
+    /// @brief Statement tags.
+    ///
+    /// The contents of the enum are indexes into the list of SQL statements.
+    /// It is assumed that the order is such that the indices of statements
+    /// reading the database are less than those of statements modifying the
+    /// database.
+    enum StatementIndex {
+        CREATE_AUDIT_REVISION,
+        CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+        GET_GLOBAL_PARAMETER4,
+        GET_ALL_GLOBAL_PARAMETERS4,
+        GET_MODIFIED_GLOBAL_PARAMETERS4,
+        GET_SUBNET4_ID_NO_TAG,
+        GET_SUBNET4_ID_ANY,
+        GET_SUBNET4_ID_UNASSIGNED,
+        GET_SUBNET4_PREFIX_NO_TAG,
+        GET_SUBNET4_PREFIX_ANY,
+        GET_SUBNET4_PREFIX_UNASSIGNED,
+        GET_ALL_SUBNETS4,
+        GET_ALL_SUBNETS4_UNASSIGNED,
+        GET_MODIFIED_SUBNETS4,
+        GET_MODIFIED_SUBNETS4_UNASSIGNED,
+        GET_SHARED_NETWORK_SUBNETS4,
+        GET_POOL4_RANGE,
+        GET_POOL4_RANGE_ANY,
+        GET_SHARED_NETWORK4_NAME_NO_TAG,
+        GET_SHARED_NETWORK4_NAME_ANY,
+        GET_SHARED_NETWORK4_NAME_UNASSIGNED,
+        GET_ALL_SHARED_NETWORKS4,
+        GET_ALL_SHARED_NETWORKS4_UNASSIGNED,
+        GET_MODIFIED_SHARED_NETWORKS4,
+        GET_MODIFIED_SHARED_NETWORKS4_UNASSIGNED,
+        GET_OPTION_DEF4_CODE_SPACE,
+        GET_ALL_OPTION_DEFS4,
+        GET_MODIFIED_OPTION_DEFS4,
+        GET_OPTION4_CODE_SPACE,
+        GET_ALL_OPTIONS4,
+        GET_MODIFIED_OPTIONS4,
+        GET_OPTION4_SUBNET_ID_CODE_SPACE,
+        GET_OPTION4_POOL_ID_CODE_SPACE,
+        GET_OPTION4_SHARED_NETWORK_CODE_SPACE,
+        GET_CLIENT_CLASS4_NAME,
+        GET_ALL_CLIENT_CLASSES4,
+        GET_ALL_CLIENT_CLASSES4_UNASSIGNED,
+        GET_MODIFIED_CLIENT_CLASSES4,
+        GET_MODIFIED_CLIENT_CLASSES4_UNASSIGNED,
+        GET_AUDIT_ENTRIES4_TIME,
+        GET_SERVER4,
+        GET_ALL_SERVERS4,
+        INSERT_GLOBAL_PARAMETER4,
+        INSERT_GLOBAL_PARAMETER4_SERVER,
+        INSERT_SUBNET4,
+        INSERT_SUBNET4_SERVER,
+        INSERT_POOL4,
+        INSERT_SHARED_NETWORK4,
+        INSERT_SHARED_NETWORK4_SERVER,
+        INSERT_OPTION_DEF4,
+        INSERT_OPTION_DEF4_CLIENT_CLASS,
+        INSERT_OPTION_DEF4_SERVER,
+        INSERT_OPTION4,
+        INSERT_OPTION4_SERVER,
+        INSERT_CLIENT_CLASS4,
+        INSERT_CLIENT_CLASS4_SERVER,
+        INSERT_CLIENT_CLASS4_DEPENDENCY,
+        INSERT_SERVER4,
+        UPDATE_GLOBAL_PARAMETER4,
+        UPDATE_SUBNET4,
+        UPDATE_SHARED_NETWORK4,
+        UPDATE_OPTION_DEF4,
+        UPDATE_OPTION_DEF4_CLIENT_CLASS,
+        UPDATE_OPTION4,
+        UPDATE_OPTION4_SUBNET_ID,
+        UPDATE_OPTION4_POOL_ID,
+        UPDATE_OPTION4_SHARED_NETWORK,
+        UPDATE_OPTION4_CLIENT_CLASS,
+        UPDATE_CLIENT_CLASS4,
+        UPDATE_CLIENT_CLASS4_SAME_POSITION,
+        UPDATE_SERVER4,
+        DELETE_GLOBAL_PARAMETER4,
+        DELETE_ALL_GLOBAL_PARAMETERS4,
+        DELETE_ALL_GLOBAL_PARAMETERS4_UNASSIGNED,
+        DELETE_SUBNET4_ID_WITH_TAG,
+        DELETE_SUBNET4_ID_ANY,
+        DELETE_SUBNET4_PREFIX_WITH_TAG,
+        DELETE_SUBNET4_PREFIX_ANY,
+        DELETE_ALL_SUBNETS4,
+        DELETE_ALL_SUBNETS4_UNASSIGNED,
+        DELETE_ALL_SUBNETS4_SHARED_NETWORK_NAME,
+        DELETE_SUBNET4_SERVER,
+        DELETE_POOLS4,
+        DELETE_SHARED_NETWORK4_NAME_WITH_TAG,
+        DELETE_SHARED_NETWORK4_NAME_ANY,
+        DELETE_ALL_SHARED_NETWORKS4,
+        DELETE_ALL_SHARED_NETWORKS4_UNASSIGNED,
+        DELETE_SHARED_NETWORK4_SERVER,
+        DELETE_OPTION_DEF4_CODE_NAME,
+        DELETE_ALL_OPTION_DEFS4,
+        DELETE_ALL_OPTION_DEFS4_UNASSIGNED,
+        DELETE_OPTION_DEFS4_CLIENT_CLASS,
+        DELETE_OPTION4,
+        DELETE_ALL_GLOBAL_OPTIONS4_UNASSIGNED,
+        DELETE_OPTION4_SUBNET_ID,
+        DELETE_OPTION4_POOL_RANGE,
+        DELETE_OPTION4_SHARED_NETWORK,
+        DELETE_OPTIONS4_SUBNET_ID_PREFIX,
+        DELETE_OPTIONS4_SHARED_NETWORK,
+        DELETE_OPTIONS4_CLIENT_CLASS,
+        DELETE_CLIENT_CLASS4_DEPENDENCY,
+        DELETE_CLIENT_CLASS4_SERVER,
+        DELETE_ALL_CLIENT_CLASSES4,
+        DELETE_ALL_CLIENT_CLASSES4_UNASSIGNED,
+        DELETE_CLIENT_CLASS4,
+        DELETE_CLIENT_CLASS4_ANY,
+        DELETE_SERVER4,
+        DELETE_ALL_SERVERS4,
+        NUM_STATEMENTS
+    };
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit MySqlConfigBackendDHCPv4Impl(const DatabaseConnection::ParameterMap&
+                                          parameters);
+
+    /// @brief Destructor.
+    ~MySqlConfigBackendDHCPv4Impl();
+
+    /// @brief Sends query to retrieve global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the parameter to be retrieved.
+    ///
+    /// @return Pointer to the retrieved value or null if such parameter
+    /// doesn't exist.
+    StampedValuePtr getGlobalParameter4(const ServerSelector& server_selector,
+                                        const std::string& name) {
+        StampedValueCollection parameters;
+
+        auto const& tags = server_selector.getTags();
+        for (auto const& tag : tags) {
+            MySqlBindingCollection in_bindings = {
+                MySqlBinding::createString(tag.get()),
+                MySqlBinding::createString(name)
+            };
+
+            getGlobalParameters(GET_GLOBAL_PARAMETER4, in_bindings, parameters);
+        }
+
+        return (parameters.empty() ? StampedValuePtr() : *parameters.begin());
+    }
+
+    /// @brief Sends query to insert or update global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter.
+    /// @param value Value of the global parameter.
+    void createUpdateGlobalParameter4(const db::ServerSelector& server_selector,
+                                      const StampedValuePtr& value) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        auto tag = getServerTag(server_selector, "creating or updating global parameter");
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(value->getName()),
+            MySqlBinding::createString(value->getValue()),
+            MySqlBinding::createInteger<uint8_t>(value->getType()),
+            MySqlBinding::createTimestamp(value->getModificationTime()),
+            MySqlBinding::createString(tag),
+            MySqlBinding::createString(value->getName())
+        };
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this, MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "global parameter set", false);
+
+        // Try to update the existing row.
+        if (conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::UPDATE_GLOBAL_PARAMETER4,
+                                    in_bindings) == 0) {
+            // No such parameter found, so let's insert it. We have to adjust the
+            // bindings collection to match the prepared statement for insert.
+            in_bindings.pop_back();
+            in_bindings.pop_back();
+            conn_.insertQuery(MySqlConfigBackendDHCPv4Impl::INSERT_GLOBAL_PARAMETER4,
+                              in_bindings);
+
+            // Successfully inserted global parameter. Now, we have to associate it
+            // with the server tag.
+
+            // Let's first get the primary key of the global parameter.
+            uint64_t id = mysql_insert_id(conn_.mysql_);
+
+            // Successfully inserted global parameter. Now, we have to associate it
+            // with the server tag.
+            attachElementToServers(MySqlConfigBackendDHCPv4Impl::INSERT_GLOBAL_PARAMETER4_SERVER,
+                                   server_selector,
+                                   MySqlBinding::createInteger<uint64_t>(id),
+                                   MySqlBinding::createTimestamp(value->getModificationTime()));
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Sends query to the database to retrieve multiple subnets.
+    ///
+    /// Query should order subnets by subnet_id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] subnets Reference to the container where fetched subnets
+    /// will be inserted.
+    void getSubnets4(const StatementIndex& index,
+                     const ServerSelector& server_selector,
+                     const MySqlBindingCollection& in_bindings,
+                     Subnet4Collection& subnets) {
+        // Create output bindings. The order must match that in the prepared
+        // statement. Please put comments only at the end of line so
+        // line counting and indexing match.
+        // The server tag must be the last field.
+        MySqlBindingCollection out_bindings = {
+            MySqlBinding::createInteger<uint32_t>(), // subnet_id
+            MySqlBinding::createString(SUBNET4_PREFIX_BUF_LENGTH), // subnet_prefix
+            MySqlBinding::createString(DHCP4O6_INTERFACE_BUF_LENGTH), // 4o6_interface
+            MySqlBinding::createString(DHCP4O6_INTERFACE_ID_BUF_LENGTH), // 4o6_interface_id
+            MySqlBinding::createString(DHCP4O6_SUBNET_BUF_LENGTH), // 4o6_subnet
+            MySqlBinding::createString(BOOT_FILE_NAME_BUF_LENGTH), // boot_file_name
+            MySqlBinding::createString(CLIENT_CLASS_BUF_LENGTH), // client_class
+            MySqlBinding::createString(INTERFACE_BUF_LENGTH), // interface
+            MySqlBinding::createInteger<uint8_t>(), // match_client_id
+            MySqlBinding::createTimestamp(), // modification_ts
+            MySqlBinding::createInteger<uint32_t>(), // next_server
+            MySqlBinding::createInteger<uint32_t>(), // rebind_timer
+            MySqlBinding::createString(RELAY_BUF_LENGTH), // relay
+            MySqlBinding::createInteger<uint32_t>(), // renew_timer
+            MySqlBinding::createString(REQUIRE_CLIENT_CLASSES_BUF_LENGTH), // require_client_classes
+            MySqlBinding::createInteger<uint8_t>(), // reservations_global
+            MySqlBinding::createString(SERVER_HOSTNAME_BUF_LENGTH), // server_hostname
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // shared_network_name
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // user_context
+            MySqlBinding::createInteger<uint32_t>(), // valid_lifetime
+            MySqlBinding::createInteger<uint64_t>(), // pool: id
+            MySqlBinding::createInteger<uint32_t>(), // pool: start_address
+            MySqlBinding::createInteger<uint32_t>(), // pool: end_address
+            MySqlBinding::createInteger<uint32_t>(), // pool: subnet_id
+            MySqlBinding::createTimestamp(), // pool: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // pool option: option_id
+            MySqlBinding::createInteger<uint8_t>(), // pool option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // pool option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // pool option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // pool option: space
+            MySqlBinding::createInteger<uint8_t>(), // pool option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // pool option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // pool option: dhcp4_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // pool option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pool option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // pool option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // pool option: pool_id
+            MySqlBinding::createTimestamp(), //pool option: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // option: option_id
+            MySqlBinding::createInteger<uint8_t>(), // option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // option: space
+            MySqlBinding::createInteger<uint8_t>(), // option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // option: dhcp4_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // option: pool_id
+            MySqlBinding::createTimestamp(), //option: modification_ts
+            MySqlBinding::createInteger<uint8_t>(), // calculate_tee_times
+            MySqlBinding::createInteger<float>(), // t1_percent
+            MySqlBinding::createInteger<float>(), // t2_percent
+            MySqlBinding::createInteger<uint8_t>(), // authoritative
+            MySqlBinding::createInteger<uint32_t>(), // min_valid_lifetime
+            MySqlBinding::createInteger<uint32_t>(), // max_valid_lifetime
+            MySqlBinding::createString(CLIENT_CLASS_BUF_LENGTH), // pool: client_class
+            MySqlBinding::createString(REQUIRE_CLIENT_CLASSES_BUF_LENGTH), // pool: require_client_classes
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pool: user_context
+            MySqlBinding::createInteger<uint8_t>(), // ddns_send_updates
+            MySqlBinding::createInteger<uint8_t>(), // ddns_override_no_update
+            MySqlBinding::createInteger<uint8_t>(), // ddns_override_client_update
+            MySqlBinding::createInteger<uint8_t>(), // ddns_replace_client_name
+            MySqlBinding::createString(DNS_NAME_BUF_LENGTH), // ddns_generated_prefix
+            MySqlBinding::createString(DNS_NAME_BUF_LENGTH), // ddns_qualifying_suffix
+            MySqlBinding::createInteger<uint8_t>(), // reservations_in_subnet
+            MySqlBinding::createInteger<uint8_t>(), // reservations_out_of_pool
+            MySqlBinding::createInteger<float>(), // cache_threshold
+            MySqlBinding::createInteger<uint32_t>(), // cache_max_age
+            MySqlBinding::createInteger<uint32_t>(), // offer lifetime
+            MySqlBinding::createString(ALLOCATOR_TYPE_BUF_LENGTH), // allocator
+            MySqlBinding::createString(SERVER_TAG_BUF_LENGTH) // server_tag
+        };
+
+        uint64_t last_pool_id = 0;
+        uint64_t last_pool_option_id = 0;
+        uint64_t last_option_id = 0;
+        Pool4Ptr last_pool;
+        std::string last_tag;
+
+        // Execute actual query.
+        conn_.selectQuery(index, in_bindings, out_bindings,
+                          [this, &subnets, &last_pool, &last_pool_id,
+                           &last_pool_option_id, &last_option_id,
+                           &last_tag]
+                          (MySqlBindingCollection& out_bindings) {
+            // Get pointer to the last subnet in the collection.
+            Subnet4Ptr last_subnet;
+            if (!subnets.empty()) {
+                last_subnet = *subnets.rbegin();
+            }
+
+            // Subnet has been returned. Assuming that subnets are ordered by
+            // subnet identifier, if the subnet identifier of the current row
+            // is different than the subnet identifier of the previously returned
+            // row, it means that we have to construct new subnet object.
+            if (!last_subnet || (last_subnet->getID() != out_bindings[0]->getInteger<uint32_t>())) {
+                // Reset per subnet component tracking and server tag because
+                // we're now starting to process a new subnet.
+                last_pool_id = 0;
+                last_pool_option_id = 0;
+                last_option_id = 0;
+                last_pool.reset();
+                last_tag.clear();
+
+                // Get subnet parameters required by the constructor first.
+
+                // subnet_id at 0.
+                SubnetID subnet_id(out_bindings[0]->getInteger<uint32_t>());
+
+                // subnet_prefix at 1.
+                std::string subnet_prefix = out_bindings[1]->getString();
+                auto prefix_pair = Subnet4::parsePrefix(subnet_prefix);
+
+                // renew_timer at 13.
+                auto renew_timer = createTriplet(out_bindings[13]);
+
+                // rebind_timer at 11.
+                auto rebind_timer = createTriplet(out_bindings[11]);
+
+                // valid_lifetime at 19.
+                // min_valid_lifetime at 55.
+                // max_valid_lifetime at 56.
+                auto valid_lifetime = createTriplet(out_bindings[19],
+                                                    out_bindings[55],
+                                                    out_bindings[56]);
+
+                // Create subnet with basic settings.
+                last_subnet = Subnet4::create(prefix_pair.first, prefix_pair.second,
+                                              renew_timer, rebind_timer,
+                                              valid_lifetime, subnet_id);
+
+                // Get other subnet parameters.
+
+                // subnet_id at 0.
+
+                // subnet_prefix at 1.
+
+                // 4o6_interface at 2.
+                if (!out_bindings[2]->amNull()) {
+                    last_subnet->get4o6().setIface4o6(out_bindings[2]->getString());
+                }
+
+                // 4o6_interface_id at 3.
+                if (!out_bindings[3]->amNull()) {
+                    std::string dhcp4o6_interface_id = out_bindings[3]->getString();
+                    OptionBuffer dhcp4o6_interface_id_buf(dhcp4o6_interface_id.begin(),
+                                                          dhcp4o6_interface_id.end());
+                    OptionPtr option_dhcp4o6_interface_id =
+                        Option::create(Option::V6, D6O_INTERFACE_ID, dhcp4o6_interface_id_buf);
+                    last_subnet->get4o6().setInterfaceId(option_dhcp4o6_interface_id);
+                }
+
+                // 4o6_subnet at 4.
+                if (!out_bindings[4]->amNull()) {
+                    std::pair<IOAddress, uint8_t> dhcp4o6_subnet_prefix_pair =
+                        Subnet6::parsePrefix(out_bindings[4]->getString());
+                    last_subnet->get4o6().setSubnet4o6(dhcp4o6_subnet_prefix_pair.first,
+                                                       dhcp4o6_subnet_prefix_pair.second);
+                }
+
+                // boot_file_name at 5.
+                if (!out_bindings[5]->amNull()) {
+                    last_subnet->setFilename(out_bindings[5]->getString());
+                }
+
+                // client_class at 6.
+                if (!out_bindings[6]->amNull()) {
+                    last_subnet->allowClientClass(out_bindings[6]->getString());
+                }
+
+                // interface at 7.
+                if (!out_bindings[7]->amNull()) {
+                    last_subnet->setIface(out_bindings[7]->getString());
+                }
+
+                // match_client_id at 8.
+                if (!out_bindings[8]->amNull()) {
+                    last_subnet->setMatchClientId(out_bindings[8]->getBool());
+                }
+
+                // modification_ts at 9.
+                last_subnet->setModificationTime(out_bindings[9]->getTimestamp());
+
+                // next_server at 10.
+                if (!out_bindings[10]->amNull()) {
+                    last_subnet->setSiaddr(IOAddress(out_bindings[10]->getInteger<uint32_t>()));
+                }
+
+                // rebind_timer at 11.
+
+                // relay at 12.
+                ElementPtr relay_element = out_bindings[12]->getJSON();
+                if (relay_element) {
+                    if (relay_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid relay value "
+                                  << out_bindings[12]->getString());
+                    }
+                    for (auto i = 0; i < relay_element->size(); ++i) {
+                        auto relay_address_element = relay_element->get(i);
+                        if (relay_address_element->getType() != Element::string) {
+                            isc_throw(BadValue, "relay address must be a string");
+                        }
+                        last_subnet->addRelayAddress(IOAddress(relay_element->get(i)->stringValue()));
+                    }
+                }
+
+                // renew_timer at 13.
+
+                // require_client_classes at 14.
+                ElementPtr require_element = out_bindings[14]->getJSON();
+                if (require_element) {
+                    if (require_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid require_client_classes value "
+                                  << out_bindings[14]->getString());
+                    }
+                    for (auto i = 0; i < require_element->size(); ++i) {
+                        auto require_item = require_element->get(i);
+                        if (require_item->getType() != Element::string) {
+                            isc_throw(BadValue, "elements of require_client_classes list must"
+                                      "be valid strings");
+                        }
+                        last_subnet->requireClientClass(require_item->stringValue());
+                    }
+                }
+
+                // reservations_global at 15.
+                if (!out_bindings[15]->amNull()) {
+                    last_subnet->setReservationsGlobal(out_bindings[15]->getBool());
+                }
+
+                // server_hostname at 16.
+                if (!out_bindings[16]->amNull()) {
+                    last_subnet->setSname(out_bindings[16]->getString());
+                }
+
+                // shared_network_name at 17.
+                if (!out_bindings[17]->amNull()) {
+                    last_subnet->setSharedNetworkName(out_bindings[17]->getString());
+                }
+
+                // user_context at 18.
+                ElementPtr user_context = out_bindings[18]->getJSON();
+                if (user_context) {
+                    last_subnet->setContext(user_context);
+                }
+
+                // valid_lifetime at 19.
+
+                // pool and option from 20 to 50.
+
+                // calculate_tee_times at 51.
+                if (!out_bindings[51]->amNull()) {
+                    last_subnet->setCalculateTeeTimes(out_bindings[51]->getBool());
+                }
+
+                // t1_percent at 52.
+                if (!out_bindings[52]->amNull()) {
+                    last_subnet->setT1Percent(out_bindings[52]->getFloat());
+                }
+
+                // t2_percent at 53.
+                if (!out_bindings[53]->amNull()) {
+                    last_subnet->setT2Percent(out_bindings[53]->getFloat());
+                }
+
+                // authoritative at 54.
+                if (!out_bindings[54]->amNull()) {
+                    last_subnet->setAuthoritative(out_bindings[54]->getBool());
+                }
+
+                // min_valid_lifetime at 55.
+                // max_valid_lifetime at 56.
+
+                // pool client_class, require_client_classes and user_context
+                // from 57 to 59.
+
+                // ddns_send_updates at 60.
+                if (!out_bindings[60]->amNull()) {
+                    last_subnet->setDdnsSendUpdates(out_bindings[60]->getBool());
+                }
+
+                // ddns_override_no_update at 61.
+                if (!out_bindings[61]->amNull()) {
+                    last_subnet->setDdnsOverrideNoUpdate(out_bindings[61]->getBool());
+                }
+
+                // ddns_override_client_update at 62.
+                if (!out_bindings[62]->amNull()) {
+                    last_subnet->setDdnsOverrideClientUpdate(out_bindings[62]->getBool());
+                }
+
+                // ddns_replace_client_name at 63.
+                if (!out_bindings[63]->amNull()) {
+                    last_subnet->setDdnsReplaceClientNameMode(static_cast<D2ClientConfig::ReplaceClientNameMode>
+                        (out_bindings[63]->getInteger<uint8_t>()));
+                }
+
+                // ddns_generated_prefix at 64.
+                if (!out_bindings[64]->amNull()) {
+                    last_subnet->setDdnsGeneratedPrefix(out_bindings[64]->getString());
+                }
+
+                // ddns_qualifying_suffix at 65.
+                if (!out_bindings[65]->amNull()) {
+                    last_subnet->setDdnsQualifyingSuffix(out_bindings[65]->getString());
+                }
+
+                // reservations_in_subnet at 66.
+                if (!out_bindings[66]->amNull()) {
+                    last_subnet->setReservationsInSubnet(out_bindings[66]->getBool());
+                }
+
+                // reservations_out_of_pool at 67.
+                if (!out_bindings[67]->amNull()) {
+                    last_subnet->setReservationsOutOfPool(out_bindings[67]->getBool());
+                }
+
+                // cache_threshold at 68.
+                if (!out_bindings[68]->amNull()) {
+                    last_subnet->setCacheThreshold(out_bindings[68]->getFloat());
+                }
+
+                // cache_max_age at 69.
+                if (!out_bindings[69]->amNull()) {
+                    last_subnet->setCacheMaxAge(out_bindings[69]->getInteger<uint32_t>());
+                }
+
+                // offer lifetime at 70.
+                if (!out_bindings[70]->amNull()) {
+                    Optional<uint32_t> offer_lft(out_bindings[70]->getInteger<uint32_t>());
+                    last_subnet->setOfferLft(offer_lft);
+                }
+
+                // allocator at 71.
+                if (!out_bindings[71]->amNull()) {
+                    last_subnet->setAllocatorType(out_bindings[71]->getString());
+                }
+
+                // server_tag at 72.
+
+                // Subnet ready. Add it to the list.
+                auto ret = subnets.insert(last_subnet);
+
+                // subnets is a multi index container with unique indexes
+                // but these indexes are unique too in the database,
+                // so this is for sanity only.
+                if (!ret.second) {
+                    isc_throw(Unexpected, "add subnet failed");
+                }
+            }
+
+            // Check for new server tags at 71.
+            if (!out_bindings[72]->amNull() &&
+                (last_tag != out_bindings[72]->getString())) {
+                last_tag = out_bindings[72]->getString();
+                if (!last_tag.empty() && !last_subnet->hasServerTag(ServerTag(last_tag))) {
+                    last_subnet->setServerTag(last_tag);
+                }
+            }
+
+            // If the row contains information about the pool and it appears to be
+            // new pool entry (checked by comparing pool id), let's create the new
+            // pool and add it to the subnet.
+            // pool id at 20.
+            // pool start_address at 21.
+            // pool end_address at 22.
+            // pool subnet_id at 23 (ignored)
+            // pool modification_ts at 24 (ignored)
+            if (!out_bindings[20]->amNull() &&
+                (out_bindings[21]->getInteger<uint32_t>() != 0) &&
+                (out_bindings[22]->getInteger<uint32_t>() != 0) &&
+                (out_bindings[20]->getInteger<uint64_t>() > last_pool_id)) {
+                last_pool_id = out_bindings[20]->getInteger<uint64_t>();
+                last_pool = Pool4::create(IOAddress(out_bindings[21]->getInteger<uint32_t>()),
+                                          IOAddress(out_bindings[22]->getInteger<uint32_t>()));
+
+                // pool client_class at 57.
+                if (!out_bindings[57]->amNull()) {
+                    last_pool->allowClientClass(out_bindings[57]->getString());
+                }
+
+                // pool require_client_classes at 58.
+                ElementPtr require_element = out_bindings[58]->getJSON();
+                if (require_element) {
+                    if (require_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid pool require_client_classes value "
+                                  << out_bindings[58]->getString());
+                    }
+                    for (auto i = 0; i < require_element->size(); ++i) {
+                        auto require_item = require_element->get(i);
+                        if (require_item->getType() != Element::string) {
+                            isc_throw(BadValue, "elements of pool require_client_classes list must"
+                                      "be valid strings");
+                        }
+                        last_pool->requireClientClass(require_item->stringValue());
+                    }
+                }
+
+                // pool user_context at 59.
+                ElementPtr user_context = out_bindings[59]->getJSON();
+                if (user_context) {
+                    last_pool->setContext(user_context);
+                }
+
+                last_subnet->addPool(last_pool);
+            }
+
+            // Parse pool-specific option from 25 to 37.
+            if (last_pool && !out_bindings[25]->amNull() &&
+                (last_pool_option_id < out_bindings[25]->getInteger<uint64_t>())) {
+                last_pool_option_id = out_bindings[25]->getInteger<uint64_t>();
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V4, out_bindings.begin() + 25);
+                if (desc) {
+                    last_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+
+            // Parse subnet-specific option from 38 to 50.
+            if (!out_bindings[38]->amNull() &&
+                (last_option_id < out_bindings[38]->getInteger<uint64_t>())) {
+                last_option_id = out_bindings[38]->getInteger<uint64_t>();
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V4, out_bindings.begin() + 38);
+                if (desc) {
+                    last_subnet->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        // Now that we're done fetching the whole subnet, we have to
+        // check if it has matching server tags and toss it if it
+        // doesn't. We skip matching the server tags if we're asking
+        // for ANY subnet.
+        auto& subnet_index = subnets.get<SubnetSubnetIdIndexTag>();
+        tossNonMatchingElements(server_selector, subnet_index);
+    }
+
+    /// @brief Sends query to retrieve single subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Subnet identifier.
+    ///
+    /// @return Pointer to the returned subnet or NULL if such subnet
+    /// doesn't exist.
+    Subnet4Ptr getSubnet4(const ServerSelector& server_selector,
+                          const SubnetID& subnet_id) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a subnet. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        MySqlBindingCollection in_bindings = { MySqlBinding::createInteger<uint32_t>(subnet_id) };
+
+        auto index = GET_SUBNET4_ID_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = GET_SUBNET4_ID_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = GET_SUBNET4_ID_ANY;
+        }
+
+        Subnet4Collection subnets;
+        getSubnets4(index, server_selector, in_bindings, subnets);
+
+        return (subnets.empty() ? Subnet4Ptr() : *subnets.begin());
+    }
+
+    /// @brief Sends query to retrieve single subnet by prefix.
+    ///
+    /// The prefix should be in the following format: "192.0.2.0/24".
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Subnet identifier.
+    ///
+    /// @return Pointer to the returned subnet or NULL if such subnet
+    /// doesn't exist.
+    Subnet4Ptr getSubnet4(const ServerSelector& server_selector,
+                          const std::string& subnet_prefix) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a subnet. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        MySqlBindingCollection in_bindings = { MySqlBinding::createString(subnet_prefix) };
+
+        auto index = GET_SUBNET4_PREFIX_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = GET_SUBNET4_PREFIX_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = GET_SUBNET4_PREFIX_ANY;
+        }
+
+        Subnet4Collection subnets;
+        getSubnets4(index, server_selector, in_bindings, subnets);
+
+        return (subnets.empty() ? Subnet4Ptr() : *subnets.begin());
+    }
+
+    /// @brief Sends query to retrieve all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getAllSubnets4(const ServerSelector& server_selector,
+                        Subnet4Collection& subnets) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching all subnets for ANY "
+                      "server is not supported");
+        }
+
+        auto index = (server_selector.amUnassigned() ? GET_ALL_SUBNETS4_UNASSIGNED :
+                      GET_ALL_SUBNETS4);
+        MySqlBindingCollection in_bindings;
+        getSubnets4(index, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve modified subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getModifiedSubnets4(const ServerSelector& server_selector,
+                             const boost::posix_time::ptime& modification_ts,
+                             Subnet4Collection& subnets) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified subnets for ANY "
+                      "server is not supported");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createTimestamp(modification_ts)
+        };
+
+        auto index = (server_selector.amUnassigned() ? GET_MODIFIED_SUBNETS4_UNASSIGNED :
+                      GET_MODIFIED_SUBNETS4);
+        getSubnets4(index, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve all subnets belonging to a shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be retrieved.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getSharedNetworkSubnets4(const ServerSelector& server_selector,
+                                  const std::string& shared_network_name,
+                                  Subnet4Collection& subnets) {
+        MySqlBindingCollection in_bindings = { MySqlBinding::createString(shared_network_name) };
+        getSubnets4(GET_SHARED_NETWORK_SUBNETS4, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve multiple pools.
+    ///
+    /// Query should order pools by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] pools Reference to the container where fetched pools
+    /// will be inserted.
+    /// @param [out] pool_ids Identifiers of the pools returned in @c pools
+    /// argument.
+    void getPools(const StatementIndex& index,
+                  const MySqlBindingCollection& in_bindings,
+                  PoolCollection& pools,
+                  std::vector<uint64_t>& pool_ids) {
+        MySqlBindingCollection out_bindings = {
+            MySqlBinding::createInteger<uint64_t>(), // pool: id
+            MySqlBinding::createInteger<uint32_t>(), // pool: start_address
+            MySqlBinding::createInteger<uint32_t>(), // pool: end_address
+            MySqlBinding::createInteger<uint32_t>(), // pool: subnet_id
+            MySqlBinding::createString(CLIENT_CLASS_BUF_LENGTH), // pool: client_class
+            MySqlBinding::createString(REQUIRE_CLIENT_CLASSES_BUF_LENGTH), // pool: require_client_classes
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pool: user_context
+            MySqlBinding::createTimestamp(), // pool: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // pool option: option_id
+            MySqlBinding::createInteger<uint8_t>(), // pool option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // pool option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // pool option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // pool option: space
+            MySqlBinding::createInteger<uint8_t>(), // pool option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // pool option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // pool option: dhcp4_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // pool option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pool option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // pool option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // pool option: pool_id
+            MySqlBinding::createTimestamp(), //pool option: modification_ts
+        };
+
+        uint64_t last_pool_id = 0;
+        uint64_t last_pool_option_id = 0;
+        Pool4Ptr last_pool;
+
+        conn_.selectQuery(index, in_bindings, out_bindings,
+                          [this, &last_pool_id, &last_pool_option_id, &last_pool,
+                           &pools, &pool_ids]
+                          (MySqlBindingCollection& out_bindings) {
+            if (out_bindings[0]->getInteger<uint64_t>() > last_pool_id) {
+                // pool id (0)
+                last_pool_id = out_bindings[0]->getInteger<uint64_t>();
+
+                // pool start_address (1)
+                // pool end_address (2)
+
+                last_pool = Pool4::create(IOAddress(out_bindings[1]->getInteger<uint32_t>()),
+                                          IOAddress(out_bindings[2]->getInteger<uint32_t>()));
+
+                // pool subnet_id (3) (ignored)
+
+                // pool client_class (4)
+                if (!out_bindings[4]->amNull()) {
+                    last_pool->allowClientClass(out_bindings[4]->getString());
+                }
+
+                // pool require_client_classes (5)
+                ElementPtr require_element = out_bindings[5]->getJSON();
+                if (require_element) {
+                    if (require_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid pool require_client_classes value "
+                                  << out_bindings[5]->getString());
+                    }
+                    for (auto i = 0; i < require_element->size(); ++i) {
+                        auto require_item = require_element->get(i);
+                        if (require_item->getType() != Element::string) {
+                            isc_throw(BadValue, "elements of pool require_client_classes list must"
+                                      "be valid strings");
+                        }
+                        last_pool->requireClientClass(require_item->stringValue());
+                    }
+                }
+
+                // pool user_context (6)
+                ElementPtr user_context = out_bindings[6]->getJSON();
+                if (user_context) {
+                    last_pool->setContext(user_context);
+                }
+
+                // pool: modification_ts (7) (ignored)
+
+                pools.push_back(last_pool);
+                pool_ids.push_back(last_pool_id);
+            }
+
+            // Parse pool specific option (8).
+            if (last_pool && !out_bindings[8]->amNull() &&
+                (last_pool_option_id < out_bindings[8]->getInteger<uint64_t>())) {
+                last_pool_option_id = out_bindings[8]->getInteger<uint64_t>();
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V4, out_bindings.begin() + 8);
+                if (desc) {
+                    last_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+    }
+
+    /// @brief Sends query to retrieve single pool by address range.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound pool address.
+    /// @param pool_end_address Upper bound pool address.
+    /// @param pool_id Pool identifier for the returned pool.
+    /// @return Pointer to the pool or null if no such pool found.
+    Pool4Ptr getPool4(const ServerSelector& server_selector,
+                      const IOAddress& pool_start_address,
+                      const IOAddress& pool_end_address,
+                      uint64_t& pool_id) {
+        PoolCollection pools;
+        std::vector<uint64_t> pool_ids;
+
+        if (server_selector.amAny()) {
+            MySqlBindingCollection in_bindings = {
+                MySqlBinding::createInteger<uint32_t>(pool_start_address.toUint32()),
+                MySqlBinding::createInteger<uint32_t>(pool_end_address.toUint32())
+            };
+            getPools(GET_POOL4_RANGE_ANY, in_bindings, pools, pool_ids);
+        } else {
+            auto const& tags = server_selector.getTags();
+            for (auto const& tag : tags) {
+                MySqlBindingCollection in_bindings = {
+                    MySqlBinding::createString(tag.get()),
+                    MySqlBinding::createInteger<uint32_t>(pool_start_address.toUint32()),
+                    MySqlBinding::createInteger<uint32_t>(pool_end_address.toUint32())
+                };
+                getPools(GET_POOL4_RANGE, in_bindings, pools, pool_ids);
+                // Break if something is found?
+            }
+        }
+
+        // Return upon the first pool found.
+        if (!pools.empty()) {
+            pool_id = pool_ids[0];
+            return (boost::dynamic_pointer_cast<Pool4>(*pools.begin()));
+        }
+
+        pool_id = 0;
+
+        return (Pool4Ptr());
+    }
+
+    /// @brief Sends query to insert or update subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet to be inserted or updated.
+    void createUpdateSubnet4(const ServerSelector& server_selector,
+                             const Subnet4Ptr& subnet) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "creating or updating a subnet for ANY"
+                      " server is not supported");
+
+        } else if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        // Convert DHCPv4o6 interface id to text.
+        OptionPtr dhcp4o6_interface_id = subnet->get4o6().getInterfaceId();
+        MySqlBindingPtr dhcp4o6_interface_id_binding;
+        if (dhcp4o6_interface_id) {
+            std::string dhcp4o6_interface_id_text(dhcp4o6_interface_id->getData().begin(),
+                                                  dhcp4o6_interface_id->getData().end());
+            dhcp4o6_interface_id_binding = MySqlBinding::createString(dhcp4o6_interface_id_text);
+
+        } else {
+            dhcp4o6_interface_id_binding = MySqlBinding::createNull();
+        }
+
+        // Convert DHCPv4o6 subnet to text.
+        Optional<std::string> dhcp4o6_subnet;
+        if (!subnet->get4o6().getSubnet4o6().unspecified() &&
+            (!subnet->get4o6().getSubnet4o6().get().first.isV6Zero() ||
+             (subnet->get4o6().getSubnet4o6().get().second != 128u))) {
+            std::ostringstream s;
+            s << subnet->get4o6().getSubnet4o6().get().first << "/"
+              << static_cast<int>(subnet->get4o6().getSubnet4o6().get().second);
+            dhcp4o6_subnet = s.str();
+        }
+
+        // Create JSON list of required classes.
+        ElementPtr required_classes_element = Element::createList();
+        const auto& required_classes = subnet->getRequiredClasses();
+        for (auto required_class = required_classes.cbegin();
+             required_class != required_classes.cend();
+             ++required_class) {
+            required_classes_element->add(Element::create(*required_class));
+        }
+
+        // Create binding for DDNS replace client name mode.
+        MySqlBindingPtr ddns_rcn_mode_binding;
+        auto ddns_rcn_mode = subnet->getDdnsReplaceClientNameMode(Network::Inheritance::NONE);
+        if (!ddns_rcn_mode.unspecified()) {
+            ddns_rcn_mode_binding = MySqlBinding::createInteger<uint8_t>(static_cast<uint8_t>
+                                                                         (ddns_rcn_mode.get()));
+        } else {
+            ddns_rcn_mode_binding = MySqlBinding::createNull();
+        }
+
+        // Create binding with shared network name if the subnet belongs to a
+        // shared network.
+        MySqlBindingPtr shared_network_binding;
+
+        SharedNetwork4Ptr shared_network;
+        subnet->getSharedNetwork(shared_network);
+
+        // Check if the subnet is associated with a shared network instance.
+        // If it is, create the binding using the name of the shared network.
+        if (shared_network) {
+            shared_network_binding = MySqlBinding::createString(shared_network->getName());
+
+        // If the subnet is associated with a shared network by name (no
+        // shared network instance), use this name to create the binding.
+        // This may be the case if the subnet is added as a result of
+        // receiving a control command that merely specifies shared
+        // network name. In that case, it is expected that the shared
+        // network data is already stored in the database.
+        } else if (!subnet->getSharedNetworkName().empty()) {
+            shared_network_binding = MySqlBinding::createString(subnet->getSharedNetworkName());
+
+        // If the subnet is not associated with a shared network, create
+        // null binding.
+        } else {
+             shared_network_binding = MySqlBinding::createNull();
+        }
+
+        // Create input bindings.
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint32_t>(subnet->getID()),
+            MySqlBinding::createString(subnet->toText()),
+            MySqlBinding::condCreateString(subnet->get4o6().getIface4o6()),
+            dhcp4o6_interface_id_binding,
+            MySqlBinding::condCreateString(dhcp4o6_subnet),
+            MySqlBinding::condCreateString(subnet->getFilename(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(subnet->getClientClass(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(subnet->getIface(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getMatchClientId(Network::Inheritance::NONE)),
+            MySqlBinding::createTimestamp(subnet->getModificationTime()),
+            MySqlBinding::condCreateIPv4Address(subnet->getSiaddr(Network::Inheritance::NONE)),
+            createBinding(subnet->getT2(Network::Inheritance::NONE)),
+            createInputRelayBinding(subnet),
+            createBinding(subnet->getT1(Network::Inheritance::NONE)),
+            createInputRequiredClassesBinding(subnet),
+            MySqlBinding::condCreateBool(subnet->getReservationsGlobal(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(subnet->getSname(Network::Inheritance::NONE)),
+            shared_network_binding,
+            createInputContextBinding(subnet),
+            createBinding(subnet->getValid(Network::Inheritance::NONE)),
+            createMinBinding(subnet->getValid(Network::Inheritance::NONE)),
+            createMaxBinding(subnet->getValid(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getCalculateTeeTimes(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(subnet->getT1Percent(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(subnet->getT2Percent(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getAuthoritative(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getDdnsSendUpdates(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getDdnsOverrideNoUpdate(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getDdnsOverrideClientUpdate(Network::Inheritance::NONE)),
+            ddns_rcn_mode_binding,
+            MySqlBinding::condCreateString(subnet->getDdnsGeneratedPrefix(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(subnet->getDdnsQualifyingSuffix(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getReservationsInSubnet(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getReservationsOutOfPool(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(subnet->getCacheThreshold(Network::Inheritance::NONE)),
+            condCreateInteger<uint32_t>(subnet->getCacheMaxAge(Network::Inheritance::NONE)),
+            condCreateInteger<uint32_t>(subnet->getOfferLft(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(subnet->getAllocatorType(Network::Inheritance::NONE))
+        };
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision audit_revision(this,
+                                           MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                                           server_selector, "subnet set", true);
+
+        try {
+
+            // Try to insert subnet. If this duplicates unique key, i.e. this
+            // subnet already exists it will throw DuplicateEntry exception in
+            // which case we'll try an update.
+            conn_.insertQuery(MySqlConfigBackendDHCPv4Impl::INSERT_SUBNET4,
+                              in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            deletePools4(subnet);
+            deleteOptions4(ServerSelector::ANY(), subnet);
+
+            // Need to add two more bindings for WHERE clause.
+            in_bindings.push_back(MySqlBinding::createInteger<uint32_t>(subnet->getID()));
+            in_bindings.push_back(MySqlBinding::createString(subnet->toText()));
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::UPDATE_SUBNET4,
+                                    in_bindings);
+
+            MySqlBindingCollection in_server_bindings = {
+                MySqlBinding::createInteger<uint32_t>(subnet->getID())
+            };
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_SERVER,
+                                    in_server_bindings);
+        }
+
+        // Insert associations with the servers.
+        attachElementToServers(MySqlConfigBackendDHCPv4Impl::INSERT_SUBNET4_SERVER,
+                               server_selector,
+                               MySqlBinding::createInteger<uint32_t>(subnet->getID()),
+                               MySqlBinding::createTimestamp(subnet->getModificationTime()));
+
+        // (Re)create pools.
+        for (auto pool : subnet->getPools(Lease::TYPE_V4)) {
+            createPool4(server_selector, boost::dynamic_pointer_cast<Pool4>(pool),
+                        subnet);
+        }
+
+        // (Re)create options.
+        auto option_spaces = subnet->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = subnet->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption4(server_selector, subnet->getID(), desc_copy,
+                                    true);
+            }
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Inserts new IPv4 pool to the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool Pointer to the pool to be inserted.
+    /// @param subnet Pointer to the subnet that this pool belongs to.
+    void createPool4(const ServerSelector& server_selector, const Pool4Ptr& pool,
+                     const Subnet4Ptr& subnet) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint32_t>(pool->getFirstAddress().toUint32()),
+            MySqlBinding::createInteger<uint32_t>(pool->getLastAddress().toUint32()),
+            MySqlBinding::createInteger<uint32_t>(static_cast<uint32_t>(subnet->getID())),
+            MySqlBinding::condCreateString(pool->getClientClass()),
+            createInputRequiredClassesBinding(pool),
+            createInputContextBinding(pool),
+            MySqlBinding::createTimestamp(subnet->getModificationTime())
+        };
+
+        // Run INSERT.
+        conn_.insertQuery(INSERT_POOL4, in_bindings);
+
+        uint64_t pool_id = mysql_insert_id(conn_.mysql_);
+        auto option_spaces = pool->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = pool->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption4(server_selector, pool_id, desc_copy, true);
+            }
+        }
+    }
+
+    /// @brief Sends a query to delete data from a table.
+    ///
+    /// If creates a new audit revision for this change if such audit
+    /// revision doesn't exist yet (using ScopedAuditRevision mechanism).
+    ///
+    /// @tparam Args type of the arguments to be passed to one of the existing
+    /// @c deleteFromTable methods.
+    /// @param server_selector server selector.
+    /// @param operation operation which results in calling this function. This is
+    /// used for logging purposes.
+    /// @param log_message log message to be associated with the audit revision.
+    /// @param cascade_delete boolean flag indicating if we're performing
+    /// cascade delete. If set to true, the audit entries for the child
+    /// objects (e.g. DHCPoptions) won't be created.
+    /// @param keys arguments to be passed to one of the existing
+    /// @c deleteFromTable methods.
+    ///
+    /// @return Number of deleted entries.
+    template<typename... Args>
+    uint64_t deleteTransactional(const int index,
+                                 const db::ServerSelector& server_selector,
+                                 const std::string& operation,
+                                 const std::string& log_message,
+                                 const bool cascade_delete,
+                                 Args&&... keys) {
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, log_message, cascade_delete);
+
+        auto count = deleteFromTable(index, server_selector, operation, keys...);
+
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Sends query to delete subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    uint64_t deleteSubnet4(const ServerSelector& server_selector,
+                           const SubnetID& subnet_id) {
+        int index = (server_selector.amAny() ?
+                     MySqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_ID_ANY :
+                     MySqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_ID_WITH_TAG);
+        return (deleteTransactional(index, server_selector,
+                                    "deleting a subnet", "subnet deleted",
+                                    true, static_cast<uint32_t>(subnet_id)));
+    }
+
+    /// @brief Sends query to delete subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    uint64_t deleteSubnet4(const ServerSelector& server_selector,
+                           const std::string& subnet_prefix) {
+        int index = (server_selector.amAny() ?
+                     MySqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_PREFIX_ANY :
+                     MySqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_PREFIX_WITH_TAG);
+        return (deleteTransactional(index, server_selector,
+                                    "deleting a subnet", "subnet deleted",
+                                    true, subnet_prefix));
+    }
+
+    /// @brief Deletes pools belonging to a subnet from the database.
+    ///
+    /// The query deletes all pools associated with the subnet's
+    /// identifier or prefix.
+    /// @param subnet Pointer to the subnet for which pools should be
+    /// deleted.
+    uint64_t deletePools4(const Subnet4Ptr& subnet) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint32_t>(subnet->getID()),
+            MySqlBinding::createString(subnet->toText())
+        };
+
+        // Run DELETE.
+        return (conn_.updateDeleteQuery(DELETE_POOLS4, in_bindings));
+    }
+
+    /// @brief Sends query to the database to retrieve multiple shared
+    /// networks.
+    ///
+    /// Query should order shared networks by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] shared_networks Reference to the container where fetched
+    /// shared networks will be inserted.
+    void getSharedNetworks4(const StatementIndex& index,
+                            const ServerSelector& server_selector,
+                            const MySqlBindingCollection& in_bindings,
+                            SharedNetwork4Collection& shared_networks) {
+        // Create output bindings. The order must match that in the prepared
+        // statement. Please put comments only at the end of line so
+        // line counting and indexing match.
+        // The server tag must be the last field.
+        MySqlBindingCollection out_bindings = {
+            MySqlBinding::createInteger<uint64_t>(), // id
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // name
+            MySqlBinding::createString(CLIENT_CLASS_BUF_LENGTH), // client_class
+            MySqlBinding::createString(INTERFACE_BUF_LENGTH), // interface
+            MySqlBinding::createInteger<uint8_t>(), // match_client_id
+            MySqlBinding::createTimestamp(), // modification_ts
+            MySqlBinding::createInteger<uint32_t>(), // rebind_timer
+            MySqlBinding::createString(RELAY_BUF_LENGTH), // relay
+            MySqlBinding::createInteger<uint32_t>(), // renew_timer
+            MySqlBinding::createString(REQUIRE_CLIENT_CLASSES_BUF_LENGTH), // require_client_classes
+            MySqlBinding::createInteger<uint8_t>(), // reservations_global
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // user_context
+            MySqlBinding::createInteger<uint32_t>(), // valid_lifetime
+            MySqlBinding::createInteger<uint64_t>(), // option: option_id
+            MySqlBinding::createInteger<uint8_t>(), // option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // option: space
+            MySqlBinding::createInteger<uint8_t>(), // option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // option: dhcp4_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // option: pool_id
+            MySqlBinding::createTimestamp(), // option: modification_ts
+            MySqlBinding::createInteger<uint8_t>(), // calculate_tee_times
+            MySqlBinding::createInteger<float>(), // t1_percent
+            MySqlBinding::createInteger<float>(), // t2_percent
+            MySqlBinding::createInteger<uint8_t>(), // authoritative
+            MySqlBinding::createString(BOOT_FILE_NAME_BUF_LENGTH), // boot_file_name
+            MySqlBinding::createInteger<uint32_t>(), // next_server
+            MySqlBinding::createString(SERVER_HOSTNAME_BUF_LENGTH), // server_hostname
+            MySqlBinding::createInteger<uint32_t>(), // min_valid_lifetime
+            MySqlBinding::createInteger<uint32_t>(), // max_valid_lifetime
+            MySqlBinding::createInteger<uint8_t>(), // ddns_send_updates
+            MySqlBinding::createInteger<uint8_t>(), // ddns_override_no_update
+            MySqlBinding::createInteger<uint8_t>(), // ddns_override_client_update
+            MySqlBinding::createInteger<uint8_t>(), // ddns_replace_client_name
+            MySqlBinding::createString(DNS_NAME_BUF_LENGTH), // ddns_generated_prefix
+            MySqlBinding::createString(DNS_NAME_BUF_LENGTH), // ddns_qualifying_suffix
+            MySqlBinding::createInteger<uint8_t>(), // reservations_in_subnet
+            MySqlBinding::createInteger<uint8_t>(), // reservations_out_of_pool
+            MySqlBinding::createInteger<float>(), // cache_threshold
+            MySqlBinding::createInteger<uint32_t>(), // cache_max_age
+            MySqlBinding::createInteger<uint32_t>(), // offer lifetime
+            MySqlBinding::createString(ALLOCATOR_TYPE_BUF_LENGTH), // allocator
+            MySqlBinding::createString(SERVER_TAG_BUF_LENGTH) // server_tag
+        };
+
+        uint64_t last_network_id = 0;
+        uint64_t last_option_id = 0;
+        std::string last_tag;
+
+        conn_.selectQuery(index, in_bindings, out_bindings,
+                          [this, &shared_networks, &last_network_id, &last_option_id,
+                           &last_tag]
+                          (MySqlBindingCollection& out_bindings) {
+            SharedNetwork4Ptr last_network;
+            if (!shared_networks.empty()) {
+                last_network = *shared_networks.rbegin();
+            }
+
+            // If this is the first shared network or the shared network id in this
+            // row points to the next shared network we use the data in the
+            // row to create the new shared network instance.
+            if (last_network_id != out_bindings[0]->getInteger<uint64_t>()) {
+                // Reset per shared network component tracking and server tag because
+                // we're now starting to process a new shared network.
+                last_option_id = 0;
+                last_tag.clear();
+
+                // id at 0.
+                last_network_id = out_bindings[0]->getInteger<uint64_t>();
+
+                // name at 1.
+                last_network = SharedNetwork4::create(out_bindings[1]->getString());
+                last_network->setId(last_network_id);
+
+                // client_class at 2.
+                if (!out_bindings[2]->amNull()) {
+                    last_network->allowClientClass(out_bindings[2]->getString());
+                }
+
+                // interface at 3.
+                if (!out_bindings[3]->amNull()) {
+                    last_network->setIface(out_bindings[3]->getString());
+                }
+
+                // match_client_id at 4.
+                if (!out_bindings[4]->amNull()) {
+                    last_network->setMatchClientId(out_bindings[4]->getBool());
+                }
+
+                // modification_ts at 5.
+                last_network->setModificationTime(out_bindings[5]->getTimestamp());
+
+                // rebind_timer at 6.
+                if (!out_bindings[6]->amNull()) {
+                    last_network->setT2(createTriplet(out_bindings[6]));
+                }
+
+                // relay at 7.
+                ElementPtr relay_element = out_bindings[7]->getJSON();
+                if (relay_element) {
+                    if (relay_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid relay value "
+                                  << out_bindings[7]->getString());
+                    }
+                    for (auto i = 0; i < relay_element->size(); ++i) {
+                        auto relay_address_element = relay_element->get(i);
+                        if (relay_address_element->getType() != Element::string) {
+                            isc_throw(BadValue, "relay address must be a string");
+                        }
+                        last_network->addRelayAddress(IOAddress(relay_element->get(i)->stringValue()));
+                    }
+                }
+
+                // renew_timer at 8.
+                if (!out_bindings[8]->amNull()) {
+                    last_network->setT1(createTriplet(out_bindings[8]));
+                }
+
+                // require_client_classes at 9.
+                ElementPtr require_element = out_bindings[9]->getJSON();
+                if (require_element) {
+                    if (require_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid require_client_classes value "
+                              << out_bindings[9]->getString());
+                    }
+                    for (auto i = 0; i < require_element->size(); ++i) {
+                        auto require_item = require_element->get(i);
+                        if (require_item->getType() != Element::string) {
+                            isc_throw(BadValue, "elements of require_client_classes list must"
+                                      "be valid strings");
+                        }
+                        last_network->requireClientClass(require_item->stringValue());
+                    }
+                }
+
+                // reservations_global at 10.
+                if (!out_bindings[10]->amNull()) {
+                    last_network->setReservationsGlobal(out_bindings[10]->getBool());
+                }
+
+                // user_context at 11.
+                ElementPtr user_context = out_bindings[11]->getJSON();
+                if (user_context) {
+                    last_network->setContext(user_context);
+                }
+
+                // valid_lifetime at 12.
+                // min_valid_lifetime at 33.
+                // max_valid_lifetime at 34.
+                if (!out_bindings[12]->amNull()) {
+                    last_network->setValid(createTriplet(out_bindings[12],
+                                                         out_bindings[33],
+                                                         out_bindings[34]));
+                }
+
+                // option from 13 to 25.
+
+                // calculate_tee_times at 26.
+                if (!out_bindings[26]->amNull()) {
+                    last_network->setCalculateTeeTimes(out_bindings[26]->getBool());
+                }
+
+                // t1_percent at 27.
+                if (!out_bindings[27]->amNull()) {
+                    last_network->setT1Percent(out_bindings[27]->getFloat());
+                }
+
+                // t2_percent at 28.
+                if (!out_bindings[28]->amNull()) {
+                    last_network->setT2Percent(out_bindings[28]->getFloat());
+                }
+
+                // authoritative at 29.
+                if (!out_bindings[29]->amNull()) {
+                    last_network->setAuthoritative(out_bindings[29]->getBool());
+                }
+
+                // boot_file_name at 30.
+                if (!out_bindings[30]->amNull()) {
+                    last_network->setFilename(out_bindings[30]->getString());
+                }
+
+                // next_server at 31.
+                if (!out_bindings[31]->amNull()) {
+                    last_network->setSiaddr(IOAddress(out_bindings[31]->getInteger<uint32_t>()));
+                }
+
+                // server_hostname at 32.
+                if (!out_bindings[32]->amNull()) {
+                    last_network->setSname(out_bindings[32]->getString());
+                }
+
+                // min_valid_lifetime at 33.
+                // max_valid_lifetime at 34.
+
+                // ddns_send_updates at 35.
+                if (!out_bindings[35]->amNull()) {
+                    last_network->setDdnsSendUpdates(out_bindings[35]->getBool());
+                }
+
+                // ddns_override_no_update at 36.
+                if (!out_bindings[36]->amNull()) {
+                    last_network->setDdnsOverrideNoUpdate(out_bindings[36]->getBool());
+                }
+
+                // ddns_override_client_update at 37.
+                if (!out_bindings[37]->amNull()) {
+                    last_network->setDdnsOverrideClientUpdate(out_bindings[37]->getBool());
+                }
+
+                // ddns_replace_client_name at 38.
+                if (!out_bindings[38]->amNull()) {
+                    last_network->setDdnsReplaceClientNameMode(static_cast<D2ClientConfig::ReplaceClientNameMode>
+                        (out_bindings[38]->getInteger<uint8_t>()));
+                }
+
+                // ddns_generated_prefix at 39.
+                if (!out_bindings[39]->amNull()) {
+                    last_network->setDdnsGeneratedPrefix(out_bindings[39]->getString());
+                }
+
+                // ddns_qualifying_suffix at 40.
+                if (!out_bindings[40]->amNull()) {
+                    last_network->setDdnsQualifyingSuffix(out_bindings[40]->getString());
+                }
+
+                // reservations_in_subnet at 41.
+                if (!out_bindings[41]->amNull()) {
+                    last_network->setReservationsInSubnet(out_bindings[41]->getBool());
+                }
+
+                // reservations_in_subnet at 42.
+                if (!out_bindings[42]->amNull()) {
+                    last_network->setReservationsOutOfPool(out_bindings[42]->getBool());
+                }
+
+                // cache_threshold at 43.
+                if (!out_bindings[43]->amNull()) {
+                    last_network->setCacheThreshold(out_bindings[43]->getFloat());
+                }
+
+                // cache_max_age at 44.
+                if (!out_bindings[44]->amNull()) {
+                    last_network->setCacheMaxAge(out_bindings[44]->getInteger<uint32_t>());
+                }
+
+                // offer lifetime at 45.
+                if (!out_bindings[45]->amNull()) {
+                    Optional<uint32_t> offer_lft(out_bindings[45]->getInteger<uint32_t>());
+                    last_network->setOfferLft(offer_lft);
+                }
+
+                // allocator at 46.
+                if (!out_bindings[46]->amNull()) {
+                    last_network->setAllocatorType(out_bindings[46]->getString());
+                }
+
+                // server_tag at 47.
+
+                // Add the shared network.
+                auto ret = shared_networks.push_back(last_network);
+
+                // shared_networks is a multi index container with an unique
+                // index but this index is unique too in the database,
+                // so this is for sanity only.
+                if (!ret.second) {
+                    isc_throw(Unexpected, "add shared network failed");
+                }
+            }
+
+            // Check for new server tags.
+            if (!out_bindings[47]->amNull() &&
+                (last_tag != out_bindings[47]->getString())) {
+                last_tag = out_bindings[47]->getString();
+                if (!last_tag.empty() && !last_network->hasServerTag(ServerTag(last_tag))) {
+                    last_network->setServerTag(last_tag);
+                }
+            }
+
+            // Parse option from 13 to 25.
+            if (!out_bindings[13]->amNull() &&
+                (last_option_id < out_bindings[13]->getInteger<uint64_t>())) {
+                last_option_id = out_bindings[13]->getInteger<uint64_t>();
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V4, out_bindings.begin() + 13);
+                if (desc) {
+                    last_network->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        // Now that we're done fetching the whole network, we have to
+        // check if it has matching server tags and toss it if it
+        // doesn't. We skip matching the server tags if we're asking
+        // for ANY shared network.
+        auto& sn_index = shared_networks.get<SharedNetworkRandomAccessIndexTag>();
+        tossNonMatchingElements(server_selector, sn_index);
+    }
+
+    /// @brief Sends query to retrieve single shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Shared network name.
+    ///
+    /// @return Pointer to the returned shared network or NULL if such shared
+    /// network doesn't exist.
+    SharedNetwork4Ptr getSharedNetwork4(const ServerSelector& server_selector,
+                                        const std::string& name) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a shared network. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        MySqlBindingCollection in_bindings = { MySqlBinding::createString(name) };
+
+        auto index = GET_SHARED_NETWORK4_NAME_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = GET_SHARED_NETWORK4_NAME_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = GET_SHARED_NETWORK4_NAME_ANY;
+        }
+
+        SharedNetwork4Collection shared_networks;
+        getSharedNetworks4(index, server_selector, in_bindings, shared_networks);
+
+        return (shared_networks.empty() ? SharedNetwork4Ptr() : *shared_networks.begin());
+    }
+
+    /// @brief Sends query to retrieve all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] shared_networks Reference to the shared networks collection
+    /// structure where shared networks should be inserted.
+    void getAllSharedNetworks4(const ServerSelector& server_selector,
+                               SharedNetwork4Collection& shared_networks) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching all shared networks for ANY "
+                      "server is not supported");
+        }
+
+        auto index = (server_selector.amUnassigned() ? GET_ALL_SHARED_NETWORKS4_UNASSIGNED :
+                      GET_ALL_SHARED_NETWORKS4);
+        MySqlBindingCollection in_bindings;
+        getSharedNetworks4(index, server_selector, in_bindings, shared_networks);
+    }
+
+    /// @brief Sends query to retrieve modified shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] shared_networks Reference to the shared networks collection
+    /// structure where shared networks should be inserted.
+    void getModifiedSharedNetworks4(const ServerSelector& server_selector,
+                                    const boost::posix_time::ptime& modification_ts,
+                                    SharedNetwork4Collection& shared_networks) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified shared networks for ANY "
+                      "server is not supported");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createTimestamp(modification_ts)
+        };
+
+        auto index = (server_selector.amUnassigned() ? GET_MODIFIED_SHARED_NETWORKS4_UNASSIGNED :
+                      GET_MODIFIED_SHARED_NETWORKS4);
+        getSharedNetworks4(index, server_selector, in_bindings, shared_networks);
+    }
+
+    /// @brief Sends query to insert or update shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the shared network to be inserted or updated.
+    void createUpdateSharedNetwork4(const ServerSelector& server_selector,
+                                    const SharedNetwork4Ptr& shared_network) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "creating or updating a shared network for ANY"
+                      " server is not supported");
+
+        } else if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        // Create binding for DDNS replace client name mode.
+        MySqlBindingPtr ddns_rcn_mode_binding;
+        auto ddns_rcn_mode = shared_network->getDdnsReplaceClientNameMode(Network::Inheritance::NONE);
+        if (!ddns_rcn_mode.unspecified()) {
+            ddns_rcn_mode_binding = MySqlBinding::createInteger<uint8_t>(static_cast<uint8_t>
+                                                                         (ddns_rcn_mode.get()));
+        } else {
+            ddns_rcn_mode_binding = MySqlBinding::createNull();
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(shared_network->getName()),
+            MySqlBinding::condCreateString(shared_network->getClientClass(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(shared_network->getIface(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getMatchClientId(Network::Inheritance::NONE)),
+            MySqlBinding::createTimestamp(shared_network->getModificationTime()),
+            createBinding(shared_network->getT2(Network::Inheritance::NONE)),
+            createInputRelayBinding(shared_network),
+            createBinding(shared_network->getT1(Network::Inheritance::NONE)),
+            createInputRequiredClassesBinding(shared_network),
+            MySqlBinding::condCreateBool(shared_network->getReservationsGlobal(Network::Inheritance::NONE)),
+            createInputContextBinding(shared_network),
+            createBinding(shared_network->getValid(Network::Inheritance::NONE)),
+            createMinBinding(shared_network->getValid(Network::Inheritance::NONE)),
+            createMaxBinding(shared_network->getValid(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getCalculateTeeTimes(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(shared_network->getT1Percent(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(shared_network->getT2Percent(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getAuthoritative(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(shared_network->getFilename(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateIPv4Address(shared_network->getSiaddr(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(shared_network->getSname(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getDdnsSendUpdates(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getDdnsOverrideNoUpdate(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getDdnsOverrideClientUpdate(Network::Inheritance::NONE)),
+            ddns_rcn_mode_binding,
+            MySqlBinding::condCreateString(shared_network->getDdnsGeneratedPrefix(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(shared_network->getDdnsQualifyingSuffix(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getReservationsInSubnet(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getReservationsOutOfPool(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(shared_network->getCacheThreshold(Network::Inheritance::NONE)),
+            condCreateInteger<uint32_t>(shared_network->getCacheMaxAge(Network::Inheritance::NONE)),
+            condCreateInteger<uint32_t>(shared_network->getOfferLft(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(shared_network->getAllocatorType(Network::Inheritance::NONE))
+        };
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "shared network set", true);
+
+        try {
+
+            // Try to insert shared network. The shared network name must be unique,
+            // so if inserting fails with DuplicateEntry exception we'll need to
+            // update existing shared network entry.
+            conn_.insertQuery(MySqlConfigBackendDHCPv4Impl::INSERT_SHARED_NETWORK4,
+                              in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            deleteOptions4(ServerSelector::ANY(), shared_network);
+
+            // Need to add one more binding for WHERE clause.
+            in_bindings.push_back(MySqlBinding::createString(shared_network->getName()));
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::UPDATE_SHARED_NETWORK4,
+                                    in_bindings);
+
+            MySqlBindingCollection in_server_bindings = {
+                MySqlBinding::createString(shared_network->getName())
+            };
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_SERVER,
+                                    in_server_bindings);
+        }
+
+        // Associate the shared network with the servers.
+        attachElementToServers(MySqlConfigBackendDHCPv4Impl::INSERT_SHARED_NETWORK4_SERVER,
+                               server_selector,
+                               MySqlBinding::createString(shared_network->getName()),
+                               MySqlBinding::createTimestamp(shared_network->getModificationTime()));
+
+        // (Re)create options.
+        auto option_spaces = shared_network->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = shared_network->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption4(server_selector, shared_network->getName(),
+                                    desc_copy, true);
+            }
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert DHCP option.
+    ///
+    /// This method expects that the server selector contains exactly one
+    /// server tag.
+    ///
+    /// @param server_selector Server selector.
+    /// @param in_bindings Collection of bindings representing an option.
+    void insertOption4(const ServerSelector& server_selector,
+                       const MySqlBindingCollection& in_bindings) {
+        conn_.insertQuery(MySqlConfigBackendDHCPv4Impl::INSERT_OPTION4,
+                          in_bindings);
+
+        // Fetch primary key value of the inserted option. We will use it in the
+        // next INSERT statement to associate this option with the server.
+        auto option_id = mysql_insert_id(conn_.mysql_);
+
+        // Timestamp is expected to be in this input binding.
+        auto timestamp_binding = in_bindings[12];
+
+        // Associate the option with the servers.
+        attachElementToServers(MySqlConfigBackendDHCPv4Impl::INSERT_OPTION4_SERVER,
+                               server_selector,
+                               MySqlBinding::createInteger<uint64_t>(option_id),
+                               timestamp_binding);
+    }
+
+    /// @brief Sends query to insert or update global DHCP option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const OptionDescriptorPtr& option) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        auto tag = getServerTag(server_selector, "creating or updating global option");
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            createOptionValueBinding(option),
+            MySqlBinding::condCreateString(option->formatted_value_),
+            MySqlBinding::condCreateString(option->space_name_),
+            MySqlBinding::createBool(option->persistent_),
+            MySqlBinding::createBool(option->cancelled_),
+            MySqlBinding::createNull(),
+            MySqlBinding::createNull(),
+            MySqlBinding::createInteger<uint8_t>(0),
+            createInputContextBinding(option),
+            MySqlBinding::createNull(),
+            MySqlBinding::createNull(),
+            MySqlBinding::createTimestamp(option->getModificationTime()),
+            MySqlBinding::createString(tag),
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            MySqlBinding::condCreateString(option->space_name_)
+        };
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "global option set", false);
+
+        if (conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION4,
+                                    in_bindings) == 0) {
+            // Remove the 3 bindings used only in case of update.
+            in_bindings.resize(in_bindings.size() - 3);
+            insertOption4(server_selector, in_bindings);
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. subnet.
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const SubnetID& subnet_id,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            createOptionValueBinding(option),
+            MySqlBinding::condCreateString(option->formatted_value_),
+            MySqlBinding::condCreateString(option->space_name_),
+            MySqlBinding::createBool(option->persistent_),
+            MySqlBinding::createBool(option->cancelled_),
+            MySqlBinding::createNull(),
+            MySqlBinding::createInteger<uint32_t>(static_cast<uint32_t>(subnet_id)),
+            MySqlBinding::createInteger<uint8_t>(1),
+            createInputContextBinding(option),
+            MySqlBinding::createNull(),
+            MySqlBinding::createNull(),
+            MySqlBinding::createTimestamp(option->getModificationTime()),
+            MySqlBinding::createInteger<uint32_t>(static_cast<uint32_t>(subnet_id)),
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            MySqlBinding::condCreateString(option->space_name_)
+        };
+
+        boost::scoped_ptr<MySqlTransaction> transaction;
+        // Only start new transaction if specified to do so. This function may
+        // be called from within an existing transaction in which case we
+        // don't start the new one.
+        if (!cascade_update) {
+            transaction.reset(new MySqlTransaction(conn_));
+        }
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "subnet specific option set",
+                           cascade_update);
+
+        if (conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_SUBNET_ID,
+                                    in_bindings) == 0) {
+            // Remove the 3 bindings used only in case of update.
+            in_bindings.resize(in_bindings.size() - 3);
+            insertOption4(server_selector, in_bindings);
+        }
+
+        if (transaction) {
+            transaction->commit();
+        }
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a pool.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool.
+    /// @param pool_end_address Upper bound address of the pool.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const IOAddress& pool_start_address,
+                             const IOAddress& pool_end_address,
+                             const OptionDescriptorPtr& option) {
+        uint64_t pool_id = 0;
+        Pool4Ptr pool = getPool4(server_selector, pool_start_address, pool_end_address,
+                                 pool_id);
+        if (!pool) {
+            isc_throw(BadValue, "no pool found for range of "
+                      << pool_start_address << " : "
+                      << pool_end_address);
+        }
+
+        createUpdateOption4(server_selector, pool_id, option, false);
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a pool.
+    ///
+    /// @param selector Server selector.
+    /// @param pool_id Identifier of the pool the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. subnet.
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const uint64_t pool_id,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            createOptionValueBinding(option),
+            MySqlBinding::condCreateString(option->formatted_value_),
+            MySqlBinding::condCreateString(option->space_name_),
+            MySqlBinding::createBool(option->persistent_),
+            MySqlBinding::createBool(option->cancelled_),
+            MySqlBinding::createNull(),
+            MySqlBinding::createNull(),
+            MySqlBinding::createInteger<uint8_t>(5),
+            createInputContextBinding(option),
+            MySqlBinding::createNull(),
+            MySqlBinding::createInteger<uint64_t>(pool_id),
+            MySqlBinding::createTimestamp(option->getModificationTime()),
+            MySqlBinding::createInteger<uint64_t>(pool_id),
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            MySqlBinding::condCreateString(option->space_name_)
+        };
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "pool specific option set",
+                           cascade_update);
+
+        if (conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_POOL_ID,
+                                    in_bindings) == 0) {
+            // Remove the 3 bindings used only in case of update.
+            in_bindings.resize(in_bindings.size() - 3);
+            insertOption4(server_selector, in_bindings);
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a shared network.
+    ///
+    /// @param selector Server selector.
+    /// @param shared_network_name Name of the shared network the option
+    /// belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. shared network.
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const std::string& shared_network_name,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            createOptionValueBinding(option),
+            MySqlBinding::condCreateString(option->formatted_value_),
+            MySqlBinding::condCreateString(option->space_name_),
+            MySqlBinding::createBool(option->persistent_),
+            MySqlBinding::createBool(option->cancelled_),
+            MySqlBinding::createNull(),
+            MySqlBinding::createNull(),
+            MySqlBinding::createInteger<uint8_t>(4),
+            createInputContextBinding(option),
+            MySqlBinding::createString(shared_network_name),
+            MySqlBinding::createNull(),
+            MySqlBinding::createTimestamp(option->getModificationTime()),
+            MySqlBinding::createString(shared_network_name),
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            MySqlBinding::condCreateString(option->space_name_)
+        };
+
+        boost::scoped_ptr<MySqlTransaction> transaction;
+        // Only start new transaction if specified to do so. This function may
+        // be called from within an existing transaction in which case we
+        // don't start the new one.
+        if (!cascade_update) {
+            transaction.reset(new MySqlTransaction(conn_));
+        }
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "shared network specific option set",
+                           cascade_update);
+
+        if (conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::
+                                    UPDATE_OPTION4_SHARED_NETWORK,
+                                    in_bindings) == 0) {
+            // Remove the 3 bindings used only in case of update.
+            in_bindings.resize(in_bindings.size() - 3);
+            insertOption4(server_selector, in_bindings);
+        }
+
+        if (transaction) {
+            transaction->commit();
+        }
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a client class.
+    ///
+    /// @param selector Server selector.
+    /// @param client_class Pointer to the client_class the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option..
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const ClientClassDefPtr& client_class,
+                             const OptionDescriptorPtr& option) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            createOptionValueBinding(option),
+            MySqlBinding::condCreateString(option->formatted_value_),
+            MySqlBinding::condCreateString(option->space_name_),
+            MySqlBinding::createBool(option->persistent_),
+            MySqlBinding::createBool(option->cancelled_),
+            MySqlBinding::createString(client_class->getName()),
+            MySqlBinding::createNull(),
+            MySqlBinding::createInteger<uint8_t>(2),
+            createInputContextBinding(option),
+            MySqlBinding::createNull(),
+            MySqlBinding::createNull(),
+            MySqlBinding::createTimestamp(option->getModificationTime()),
+            MySqlBinding::createString(client_class->getName()),
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            MySqlBinding::condCreateString(option->space_name_)
+        };
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "client class specific option set",
+                           true);
+
+        if (conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::
+                                    UPDATE_OPTION4_CLIENT_CLASS,
+                                    in_bindings) == 0) {
+            // Remove the 3 bindings used only in case of update.
+            in_bindings.resize(in_bindings.size() - 3);
+            insertOption4(server_selector, in_bindings);
+        }
+    }
+
+    /// @brief Sends query to insert or update option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Pointer to the option definition to be inserted or updated.
+    void createUpdateOptionDef4(const ServerSelector& server_selector,
+                                const OptionDefinitionPtr& option_def) {
+        createUpdateOptionDef(server_selector, option_def, DHCP4_OPTION_SPACE,
+                              MySqlConfigBackendDHCPv4Impl::GET_OPTION_DEF4_CODE_SPACE,
+                              MySqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4,
+                              MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION_DEF4,
+                              MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                              MySqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4_SERVER);
+    }
+
+    /// @brief Sends query to insert or update option definition
+    /// for a client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Pointer to the option definition to be inserted or updated.
+    /// @param client_class Client class name.
+    void createUpdateOptionDef4(const ServerSelector& server_selector,
+                                const OptionDefinitionPtr& option_def,
+                                const std::string& client_class_name) {
+        createUpdateOptionDef(server_selector, option_def, DHCP4_OPTION_SPACE,
+                              MySqlConfigBackendDHCPv4Impl::GET_OPTION_DEF4_CODE_SPACE,
+                              MySqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4_CLIENT_CLASS,
+                              MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION_DEF4_CLIENT_CLASS,
+                              MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                              MySqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4_SERVER,
+                              client_class_name);
+    }
+
+    /// @brief Sends query to delete option definition by code and
+    /// option space name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Option code.
+    /// @param name Option name.
+    /// @return Number of deleted option definitions.
+    uint64_t deleteOptionDef4(const ServerSelector& server_selector,
+                              const uint16_t code,
+                              const std::string& space) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint16_t>(code),
+            MySqlBinding::createString(space)
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION_DEF4_CODE_NAME, server_selector,
+                                    "deleting option definition",
+                                    "option definition deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Sends query to delete option definitions for a client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the client class for which option
+    /// definitions should be deleted.
+    /// @return Number of deleted option definitions.
+    uint64_t deleteOptionDefs4(const ServerSelector& server_selector,
+                               const ClientClassDefPtr& client_class) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(client_class->getName())
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION_DEFS4_CLIENT_CLASS, server_selector,
+                                    "deleting option definition for a client class",
+                                    "option definition deleted",
+                                    true,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption4(const ServerSelector& server_selector,
+                           const uint16_t code,
+                           const std::string& space) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint8_t>(code),
+            MySqlBinding::createString(space)
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION4, server_selector,
+                                    "deleting global option",
+                                    "global option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to which deleted option
+    /// belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption4(const ServerSelector& server_selector,
+                           const SubnetID& subnet_id,
+                           const uint16_t code,
+                           const std::string& space) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint32_t>(static_cast<uint32_t>(subnet_id)),
+            MySqlBinding::createInteger<uint8_t>(code),
+            MySqlBinding::createString(space)
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION4_SUBNET_ID, server_selector,
+                                    "deleting option for a subnet",
+                                    "subnet specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound pool address.
+    /// @param pool_end_address  Upper bound pool address.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption4(const db::ServerSelector& server_selector,
+                           const IOAddress& pool_start_address,
+                           const IOAddress& pool_end_address,
+                           const uint16_t code,
+                           const std::string& space) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint8_t>(code),
+            MySqlBinding::createString(space),
+            MySqlBinding::createInteger<uint32_t>(pool_start_address.toUint32()),
+            MySqlBinding::createInteger<uint32_t>(pool_end_address.toUint32())
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION4_POOL_RANGE, server_selector,
+                                    "deleting option for a pool",
+                                    "pool specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network which deleted
+    /// option belongs to
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption4(const db::ServerSelector& server_selector,
+                           const std::string& shared_network_name,
+                           const uint16_t code,
+                           const std::string& space) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(shared_network_name),
+            MySqlBinding::createInteger<uint8_t>(code),
+            MySqlBinding::createString(space)
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION4_SHARED_NETWORK, server_selector,
+                                    "deleting option for a shared network",
+                                    "shared network specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a subnet from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet for which options should be
+    /// deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions4(const ServerSelector& server_selector,
+                            const Subnet4Ptr& subnet) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint32_t>(subnet->getID()),
+            MySqlBinding::createString(subnet->toText())
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTIONS4_SUBNET_ID_PREFIX, server_selector,
+                                    "deleting options for a subnet",
+                                    "subnet specific options deleted",
+                                    true,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a shared network from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet for which options should be
+    /// deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions4(const ServerSelector& server_selector,
+                            const SharedNetwork4Ptr& shared_network) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(shared_network->getName())
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTIONS4_SHARED_NETWORK, server_selector,
+                                    "deleting options for a shared network",
+                                    "shared network specific options deleted",
+                                    true,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a client class from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the client class for which options
+    /// should be deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions4(const ServerSelector& server_selector,
+                            const ClientClassDefPtr& client_class) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(client_class->getName())
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTIONS4_CLIENT_CLASS, server_selector,
+                                    "deleting options for a client class",
+                                    "client class specific options deleted",
+                                    true,
+                                    in_bindings));
+    }
+
+    /// @brief Common function to retrieve client classes.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] client_classes Reference to a container where fetched client
+    /// classes will be inserted.
+    void getClientClasses4(const StatementIndex& index,
+                           const ServerSelector& server_selector,
+                           const MySqlBindingCollection& in_bindings,
+                           ClientClassDictionary& client_classes) {
+        MySqlBindingCollection out_bindings = {
+            MySqlBinding::createInteger<uint64_t>(), // id
+            MySqlBinding::createString(CLIENT_CLASS_NAME_BUF_LENGTH), // name
+            MySqlBinding::createString(CLIENT_CLASS_TEST_BUF_LENGTH), // test
+            MySqlBinding::createInteger<uint32_t>(), // next server
+            MySqlBinding::createString(CLIENT_CLASS_SNAME_BUF_LENGTH), // sname
+            MySqlBinding::createString(CLIENT_CLASS_FILENAME_BUF_LENGTH), // filename
+            MySqlBinding::createInteger<uint8_t>(), // required
+            MySqlBinding::createInteger<uint32_t>(), // valid lifetime
+            MySqlBinding::createInteger<uint32_t>(), // min valid lifetime
+            MySqlBinding::createInteger<uint32_t>(), // max valid lifetime
+            MySqlBinding::createInteger<uint8_t>(), // depend on known directly
+            MySqlBinding::createInteger<uint8_t>(), // depend on known indirectly
+            MySqlBinding::createTimestamp(), // modification_ts
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // user_context
+            MySqlBinding::createInteger<uint32_t>(), // offer lifetime
+            MySqlBinding::createInteger<uint64_t>(), // option def: id
+            MySqlBinding::createInteger<uint16_t>(), // option def: code
+            MySqlBinding::createString(OPTION_NAME_BUF_LENGTH), // option def: name
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // option def: space
+            MySqlBinding::createInteger<uint8_t>(), // option def: type
+            MySqlBinding::createTimestamp(), // option def: modification_ts
+            MySqlBinding::createInteger<uint8_t>(), // option def: array
+            MySqlBinding::createString(OPTION_ENCAPSULATE_BUF_LENGTH), // option def: encapsulate
+            MySqlBinding::createString(OPTION_RECORD_TYPES_BUF_LENGTH), // option def: record_types
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // option def: user_context
+            MySqlBinding::createInteger<uint64_t>(), // option: option_id
+            MySqlBinding::createInteger<uint8_t>(), // option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // option: space
+            MySqlBinding::createInteger<uint8_t>(), // option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // option: dhcp4_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // option: pool_id
+            MySqlBinding::createTimestamp(), // option: modification_ts
+            MySqlBinding::createString(SERVER_TAG_BUF_LENGTH) // server tag
+        };
+
+        std::list<ClientClassDefPtr> class_list;
+        uint64_t last_option_id = 0;
+        uint64_t last_option_def_id = 0;
+        std::string last_tag;
+
+        conn_.selectQuery(index,
+                          in_bindings, out_bindings,
+                          [this, &class_list, &last_option_id, &last_option_def_id, &last_tag]
+                          (MySqlBindingCollection& out_bindings) {
+            ClientClassDefPtr last_client_class;
+            if (!class_list.empty()) {
+                last_client_class = *class_list.rbegin();
+            }
+
+            if (!last_client_class || (last_client_class->getId() != out_bindings[0]->getInteger<uint64_t>())) {
+                last_option_id = 0;
+                last_option_def_id = 0;
+                last_tag.clear();
+
+                auto options = boost::make_shared<CfgOption>();
+                auto option_defs = boost::make_shared<CfgOptionDef>();
+
+                last_client_class = boost::make_shared<ClientClassDef>(out_bindings[1]->getString(),
+                                                                       ExpressionPtr(), options);
+                last_client_class->setCfgOptionDef(option_defs);
+
+                // id
+                last_client_class->setId(out_bindings[0]->getInteger<uint64_t>());
+
+                // name
+                last_client_class->setName(out_bindings[1]->getString());
+
+                // test
+                if (!out_bindings[2]->amNull()) {
+                    last_client_class->setTest(out_bindings[2]->getString());
+                }
+
+                // next server
+                if (!out_bindings[3]->amNull()) {
+                    last_client_class->setNextServer(IOAddress(out_bindings[3]->getInteger<uint32_t>()));
+                }
+
+                // sname
+                if (!out_bindings[4]->amNull()) {
+                    last_client_class->setSname(out_bindings[4]->getString());
+                }
+
+                // filename
+                if (!out_bindings[5]->amNull()) {
+                    last_client_class->setFilename(out_bindings[5]->getString());
+                }
+
+                // required
+                if (!out_bindings[6]->amNull()) {
+                    last_client_class->setRequired(out_bindings[6]->getBool());
+                }
+
+                // valid lifetime: default, min, max
+                last_client_class->setValid(createTriplet(out_bindings[7], out_bindings[8], out_bindings[9]));
+
+                // depend on known directly or indirectly
+                last_client_class->setDependOnKnown(out_bindings[10]->getBool() || out_bindings[11]->getBool());
+
+                // modification_ts
+                last_client_class->setModificationTime(out_bindings[12]->getTimestamp());
+
+                // user_context
+                ElementPtr user_context = out_bindings[13]->getJSON();
+                if (user_context) {
+                    last_client_class->setContext(user_context);
+                }
+
+                // offer lifetime
+                if (!out_bindings[14]->amNull()) {
+                    Optional<uint32_t> offer_lft(out_bindings[14]->getInteger<uint32_t>());
+                    last_client_class->setOfferLft(offer_lft);
+                }
+
+                class_list.push_back(last_client_class);
+            }
+
+            // server tag
+            if (!out_bindings[38]->amNull() &&
+                (last_tag != out_bindings[38]->getString())) {
+                last_tag = out_bindings[38]->getString();
+                if (!last_tag.empty() && !last_client_class->hasServerTag(ServerTag(last_tag))) {
+                    last_client_class->setServerTag(last_tag);
+                }
+            }
+
+            // Parse client class specific option definition from 15 to 24.
+            if (!out_bindings[15]->amNull() &&
+                (last_option_def_id < out_bindings[15]->getInteger<uint64_t>())) {
+                last_option_def_id = out_bindings[15]->getInteger<uint64_t>();
+
+                auto def = processOptionDefRow(out_bindings.begin() + 15);
+                if (def) {
+                    last_client_class->getCfgOptionDef()->add(def);
+                }
+            }
+
+            // Parse client class specific option from 25 to 37.
+            if (!out_bindings[25]->amNull() &&
+                (last_option_id < out_bindings[25]->getInteger<uint64_t>())) {
+                last_option_id = out_bindings[25]->getInteger<uint64_t>();
+                OptionDescriptorPtr desc = processOptionRow(Option::V4, out_bindings.begin() + 25);
+                if (desc) {
+                    last_client_class->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        tossNonMatchingElements(server_selector, class_list);
+
+        for (auto c : class_list) {
+            client_classes.addClass(c);
+        }
+    }
+
+    /// @brief Sends query to retrieve a client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the class to be retrieved.
+    /// @return Pointer to the client class or null if the class is not found.
+    ClientClassDefPtr getClientClass4(const ServerSelector& server_selector,
+                                      const std::string& name) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(name)
+        };
+        ClientClassDictionary client_classes;
+        getClientClasses4(MySqlConfigBackendDHCPv4Impl::GET_CLIENT_CLASS4_NAME,
+                          server_selector, in_bindings, client_classes);
+        return (client_classes.getClasses()->empty() ? ClientClassDefPtr() :
+                (*client_classes.getClasses()->begin()));
+    }
+
+    /// @brief Sends query to retrieve all client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] client_classes Reference to the client classes collection
+    /// where retrieved classes will be stored.
+    void getAllClientClasses4(const ServerSelector& server_selector,
+                              ClientClassDictionary& client_classes) {
+        MySqlBindingCollection in_bindings;
+        getClientClasses4(server_selector.amUnassigned() ?
+                          MySqlConfigBackendDHCPv4Impl::GET_ALL_CLIENT_CLASSES4_UNASSIGNED :
+                          MySqlConfigBackendDHCPv4Impl::GET_ALL_CLIENT_CLASSES4,
+                          server_selector, in_bindings, client_classes);
+    }
+
+    /// @brief Sends query to retrieve modified client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] client_classes Reference to the client classes collection
+    /// where retrieved classes will be stored.
+    void getModifiedClientClasses4(const ServerSelector& server_selector,
+                                   const boost::posix_time::ptime& modification_ts,
+                                   ClientClassDictionary& client_classes) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified client classes for ANY "
+                      "server is not supported");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createTimestamp(modification_ts)
+        };
+        getClientClasses4(server_selector.amUnassigned() ?
+                          GET_MODIFIED_CLIENT_CLASSES4_UNASSIGNED :
+                          GET_MODIFIED_CLIENT_CLASSES4,
+                          server_selector,
+                          in_bindings,
+                          client_classes);
+    }
+
+    /// @brief Upserts client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the upserted client class.
+    /// @param follow_class_name name of the class after which the
+    /// new or updated class should be positioned. An empty value
+    /// causes the class to be appended at the end of the class
+    /// hierarchy.
+    void createUpdateClientClass4(const ServerSelector& server_selector,
+                                  const ClientClassDefPtr& client_class,
+                                  const std::string& follow_class_name) {
+        // We need to evaluate class expression to see if it references any
+        // other classes (dependencies). As part of this evaluation we will
+        // also check if the client class depends on KNOWN/UNKNOWN built-in
+        // classes.
+        std::list<std::string> dependencies;
+        auto depend_on_known = false;
+        if (!client_class->getTest().empty()) {
+            ExpressionPtr expression;
+            ExpressionParser parser;
+            // Parse the test expression. The callback function is normally used to
+            // interrupt config file parsing when one of the classes refers to a
+            // non-existing client class. It returns false in this case. Here,
+            // we use the callback to capture client classes referenced by the
+            // upserted client class and record whether this class depends on
+            // KNOWN/UNKNOWN built-ins. The callback always returns true to avoid
+            // reporting the parsing error. The dependency check is performed later
+            // at the database level.
+            parser.parse(expression, Element::create(client_class->getTest()), AF_INET,
+                         [&dependencies, &depend_on_known](const ClientClass& client_class) -> bool {
+                if (isClientClassBuiltIn(client_class)) {
+                    if ((client_class == "KNOWN") || (client_class == "UNKNOWN")) {
+                        depend_on_known = true;
+                    }
+                } else {
+                    dependencies.push_back(client_class);
+                }
+                return (true);
+            });
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(client_class->getName()),
+            MySqlBinding::createString(client_class->getTest()),
+            MySqlBinding::createInteger<uint32_t>(client_class->getNextServer().toUint32()),
+            MySqlBinding::createString(client_class->getSname()),
+            MySqlBinding::createString(client_class->getFilename()),
+            MySqlBinding::createBool(client_class->getRequired()),
+            createBinding(client_class->getValid()),
+            createMinBinding(client_class->getValid()),
+            createMaxBinding(client_class->getValid()),
+            MySqlBinding::createBool(depend_on_known),
+            (follow_class_name.empty() ? MySqlBinding::createNull() :
+             MySqlBinding::createString(follow_class_name)),
+            MySqlBinding::createTimestamp(client_class->getModificationTime()),
+            createInputContextBinding(client_class),
+            condCreateInteger(client_class->getOfferLft())
+        };
+
+        MySqlTransaction transaction(conn_);
+
+        ScopedAuditRevision audit_revision(this, MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                                           server_selector, "client class set", true);
+        // Keeps track of whether the client class is inserted or updated.
+        auto update = false;
+        try {
+            conn_.insertQuery(MySqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4, in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            // Such class already exists.
+
+            // Delete options and option definitions. They will be re-created from the new class
+            // instance.
+            deleteOptions4(ServerSelector::ANY(), client_class);
+            deleteOptionDefs4(ServerSelector::ANY(), client_class);
+
+            // Try to update the class.
+            in_bindings.push_back(MySqlBinding::createString(client_class->getName()));
+            if (follow_class_name.empty()) {
+                // If position is not specified, leave the class at the same position.
+                // Remove the binding which specifies the position and use different
+                // query.
+                in_bindings.erase(in_bindings.begin() + 10, in_bindings.begin() + 11);
+                conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::UPDATE_CLIENT_CLASS4_SAME_POSITION,
+                                        in_bindings);
+            } else {
+                // Update with specifying the position.
+                conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::UPDATE_CLIENT_CLASS4,
+                                        in_bindings);
+            }
+
+            // Delete class associations with the servers and dependencies. We will re-create
+            // them according to the new class specification.
+            MySqlBindingCollection in_assoc_bindings = {
+                MySqlBinding::createString(client_class->getName())
+            };
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_DEPENDENCY,
+                                    in_assoc_bindings);
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_SERVER,
+                                    in_assoc_bindings);
+            update = true;
+        }
+
+        // Associate client class with the servers.
+        attachElementToServers(MySqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4_SERVER,
+                               server_selector,
+                               MySqlBinding::createString(client_class->getName()),
+                               MySqlBinding::createTimestamp(client_class->getModificationTime()));
+
+        // Iterate over the captured dependencies and try to insert them into the database.
+        for (auto dependency : dependencies) {
+            try {
+                MySqlBindingCollection in_dependency_bindings = {
+                    MySqlBinding::createString(client_class->getName()),
+                    MySqlBinding::createString(dependency)
+                };
+                // We deleted earlier dependencies, so we can simply insert new ones.
+                conn_.insertQuery(MySqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4_DEPENDENCY,
+                                  in_dependency_bindings);
+            } catch (const std::exception& ex) {
+                isc_throw(InvalidOperation, "unmet dependency on client class: " << dependency);
+            }
+        }
+
+        // If we performed client class update we also have to verify that its dependency
+        // on KNOWN/UNKNOWN client classes hasn't changed.
+        if (update) {
+            MySqlBindingCollection in_check_bindings;
+            conn_.insertQuery(MySqlConfigBackendDHCPv4Impl::CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+                              in_check_bindings);
+        }
+
+        // (Re)create option definitions.
+        if (client_class->getCfgOptionDef()) {
+            auto option_defs = client_class->getCfgOptionDef()->getContainer();
+            auto option_spaces = option_defs.getOptionSpaceNames();
+            for (auto option_space : option_spaces) {
+                OptionDefContainerPtr defs = option_defs.getItems(option_space);
+                for (auto def = defs->begin(); def != defs->end(); ++def) {
+                    createUpdateOptionDef4(server_selector, *def, client_class->getName());
+                }
+            }
+        }
+
+        // (Re)create options.
+        auto option_spaces = client_class->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = client_class->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption4(server_selector, client_class, desc_copy);
+            }
+        }
+
+        // All ok. Commit the transaction.
+        transaction.commit();
+    }
+
+    /// @brief Removes client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Removed client class name.
+    /// @return Number of deleted client classes.
+    uint64_t deleteClientClass4(const ServerSelector& server_selector,
+                                const std::string& name) {
+        int index = server_selector.amAny() ?
+            MySqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_ANY :
+            MySqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4;
+
+        uint64_t result = deleteTransactional(index, server_selector,
+                                              "deleting client class",
+                                              "client class deleted",
+                                              true,
+                                              name);
+        return (result);
+    }
+
+    /// @brief Removes unassigned global parameters, global options and
+    /// option definitions.
+    ///
+    /// This function is called when one or more servers are deleted and
+    /// it is likely that there are some orphaned configuration elements
+    /// left in the database. This method removes those elements.
+    void purgeUnassignedConfig() {
+        multipleUpdateDeleteQueries(DELETE_ALL_GLOBAL_PARAMETERS4_UNASSIGNED,
+                                    DELETE_ALL_GLOBAL_OPTIONS4_UNASSIGNED,
+                                    DELETE_ALL_OPTION_DEFS4_UNASSIGNED);
+    }
+
+    /// @brief Attempts to delete a server having a given tag.
+    ///
+    /// @param server_tag Tag of the server to be deleted.
+    /// @return Number of deleted servers.
+    /// @throw isc::InvalidOperation when trying to delete the logical
+    /// server 'all'.
+    uint64_t deleteServer4(const data::ServerTag& server_tag) {
+        // It is not allowed to delete 'all' logical server.
+        if (server_tag.amAll()) {
+            isc_throw(InvalidOperation, "'all' is a name reserved for the server tag which"
+                      " associates the configuration elements with all servers connecting"
+                      " to the database and may not be deleted");
+        }
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this, MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           ServerSelector::ALL(), "deleting a server", false);
+
+        // Specify which server should be deleted.
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(server_tag.get())
+        };
+
+        // Attempt to delete the server.
+        auto count = conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::DELETE_SERVER4,
+                                             in_bindings);
+
+        // If we have deleted any servers we have to remove any dangling global
+        // parameters, options and option definitions.
+        if (count > 0) {
+            purgeUnassignedConfig();
+        }
+
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Attempts to delete all servers.
+    ///
+    /// This method deletes all servers added by the user. It does not
+    /// delete the logical server 'all'.
+    ///
+    /// @return Number of deleted servers.
+    uint64_t deleteAllServers4() {
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this, MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           ServerSelector::ALL(), "deleting all servers",
+                           false);
+
+        MySqlBindingCollection in_bindings;
+
+        // Attempt to delete the servers.
+        auto count = conn_.updateDeleteQuery(MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SERVERS4,
+                                             in_bindings);
+
+        // If we have deleted any servers we have to remove any dangling global
+        // parameters, options and option definitions.
+        if (count > 0) {
+            purgeUnassignedConfig();
+        }
+
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Attempts to reconnect the server to the config DB backend manager.
+    ///
+    /// This is a self-rescheduling function that attempts to reconnect to the
+    /// server's config DB backends after connectivity to one or more have been
+    /// lost. Upon entry it will attempt to reconnect via
+    /// @ref ConfigBackendDHCPv4Mgr.addBackend.
+    /// If this is successful, DHCP servicing is re-enabled and server returns
+    /// to normal operation.
+    ///
+    /// If reconnection fails and the maximum number of retries has not been
+    /// exhausted, it will schedule a call to itself to occur at the
+    /// configured retry interval. DHCP service remains disabled.
+    ///
+    /// If the maximum number of retries has been exhausted an error is logged
+    /// and the server shuts down.
+    ///
+    /// @param db_reconnect_ctl pointer to the ReconnectCtl containing the
+    /// configured reconnect parameters.
+    /// @return true if connection has been recovered, false otherwise.
+    static bool dbReconnect(ReconnectCtlPtr db_reconnect_ctl) {
+        MultiThreadingCriticalSection cs;
+
+        // Invoke application layer connection lost callback.
+        if (!DatabaseConnection::invokeDbLostCallback(db_reconnect_ctl)) {
+            return (false);
+        }
+
+        bool reopened = false;
+
+        const std::string timer_name = db_reconnect_ctl->timerName();
+
+        // At least one connection was lost.
+        try {
+            auto srv_cfg = CfgMgr::instance().getCurrentCfg();
+            auto config_ctl = srv_cfg->getConfigControlInfo();
+            // Iterate over the configured DBs and instantiate them.
+            for (auto db : config_ctl->getConfigDatabases()) {
+                const std::string& access = db.getAccessString();
+                auto parameters = db.getParameters();
+                if (ConfigBackendDHCPv4Mgr::instance().delBackend(parameters["type"], access, true)) {
+                    ConfigBackendDHCPv4Mgr::instance().addBackend(db.getAccessString());
+                }
+            }
+
+            reopened = true;
+        } catch (const std::exception& ex) {
+            LOG_ERROR(mysql_cb_logger, MYSQL_CB_RECONNECT_ATTEMPT_FAILED4)
+                    .arg(ex.what());
+        }
+
+        if (reopened) {
+            // Cancel the timer.
+            if (TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                TimerMgr::instance()->unregisterTimer(timer_name);
+            }
+
+            // Invoke application layer connection recovered callback.
+            if (!DatabaseConnection::invokeDbRecoveredCallback(db_reconnect_ctl)) {
+                return (false);
+            }
+        } else {
+            if (!db_reconnect_ctl->checkRetries()) {
+                // We're out of retries, log it and initiate shutdown.
+                LOG_ERROR(mysql_cb_logger, MYSQL_CB_RECONNECT_FAILED4)
+                        .arg(db_reconnect_ctl->maxRetries());
+
+                // Cancel the timer.
+                if (TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                    TimerMgr::instance()->unregisterTimer(timer_name);
+                }
+
+                // Invoke application layer connection failed callback.
+                DatabaseConnection::invokeDbFailedCallback(db_reconnect_ctl);
+
+                return (false);
+            }
+
+            LOG_INFO(mysql_cb_logger, MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4)
+                    .arg(db_reconnect_ctl->maxRetries() - db_reconnect_ctl->retriesLeft() + 1)
+                    .arg(db_reconnect_ctl->maxRetries())
+                    .arg(db_reconnect_ctl->retryInterval());
+
+            // Start the timer.
+            if (!TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                TimerMgr::instance()->registerTimer(timer_name,
+                    std::bind(&MySqlConfigBackendDHCPv4Impl::dbReconnect, db_reconnect_ctl),
+                              db_reconnect_ctl->retryInterval(),
+                              asiolink::IntervalTimer::ONE_SHOT);
+            }
+            TimerMgr::instance()->setup(timer_name);
+        }
+
+        return (true);
+    }
+
+};
+
+namespace {
+
+/// @brief Array of tagged statements.
+typedef std::array<TaggedStatement, MySqlConfigBackendDHCPv4Impl::NUM_STATEMENTS>
+TaggedStatementArray;
+
+/// @brief Prepared MySQL statements used by the backend to insert and
+/// retrieve data from the database.
+TaggedStatementArray tagged_statements = { {
+    { MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+      "CALL createAuditRevisionDHCP4(?, ?, ?, ?)"
+    },
+
+    // Verify that dependency on KNOWN/UNKNOWN class has not changed.
+    { MySqlConfigBackendDHCPv4Impl::CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+      "CALL checkDHCPv4ClientClassKnownDependencyChange()"
+    },
+
+    // Select global parameter by name.
+    { MySqlConfigBackendDHCPv4Impl::GET_GLOBAL_PARAMETER4,
+      MYSQL_GET_GLOBAL_PARAMETER(dhcp4, AND g.name = ?)
+    },
+
+    // Select all global parameters.
+    { MySqlConfigBackendDHCPv4Impl::GET_ALL_GLOBAL_PARAMETERS4,
+      MYSQL_GET_GLOBAL_PARAMETER(dhcp4)
+    },
+
+    // Select modified global parameters.
+    { MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_GLOBAL_PARAMETERS4,
+      MYSQL_GET_GLOBAL_PARAMETER(dhcp4, AND g.modification_ts >= ?)
+    },
+
+    // Select subnet by id.
+    { MySqlConfigBackendDHCPv4Impl::GET_SUBNET4_ID_NO_TAG,
+      MYSQL_GET_SUBNET4_NO_TAG(WHERE s.subnet_id = ?)
+    },
+
+    // Select subnet by id without specifying server tags.
+    { MySqlConfigBackendDHCPv4Impl::GET_SUBNET4_ID_ANY,
+      MYSQL_GET_SUBNET4_ANY(WHERE s.subnet_id = ?)
+    },
+
+    // Select unassigned subnet by id.
+    { MySqlConfigBackendDHCPv4Impl::GET_SUBNET4_ID_UNASSIGNED,
+      MYSQL_GET_SUBNET4_UNASSIGNED(AND s.subnet_id = ?)
+    },
+
+    // Select subnet by prefix.
+    { MySqlConfigBackendDHCPv4Impl::GET_SUBNET4_PREFIX_NO_TAG,
+      MYSQL_GET_SUBNET4_NO_TAG(WHERE s.subnet_prefix = ?)
+    },
+
+    // Select subnet by prefix without specifying server tags.
+    { MySqlConfigBackendDHCPv4Impl::GET_SUBNET4_PREFIX_ANY,
+      MYSQL_GET_SUBNET4_ANY(WHERE s.subnet_prefix = ?)
+    },
+
+    // Select unassigned subnet by prefix.
+    { MySqlConfigBackendDHCPv4Impl::GET_SUBNET4_PREFIX_UNASSIGNED,
+      MYSQL_GET_SUBNET4_UNASSIGNED(AND s.subnet_prefix = ?)
+    },
+
+    // Select all subnets.
+    { MySqlConfigBackendDHCPv4Impl::GET_ALL_SUBNETS4,
+      MYSQL_GET_SUBNET4_NO_TAG()
+    },
+
+    // Select all unassigned subnets.
+    { MySqlConfigBackendDHCPv4Impl::GET_ALL_SUBNETS4_UNASSIGNED,
+      MYSQL_GET_SUBNET4_UNASSIGNED()
+    },
+
+    // Select subnets having modification time later than X.
+    { MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_SUBNETS4,
+      MYSQL_GET_SUBNET4_NO_TAG(WHERE s.modification_ts >= ?)
+    },
+
+    // Select modified and unassigned subnets.
+    { MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_SUBNETS4_UNASSIGNED,
+      MYSQL_GET_SUBNET4_UNASSIGNED(AND s.modification_ts >= ?)
+    },
+
+    // Select subnets belonging to a shared network.
+    { MySqlConfigBackendDHCPv4Impl::GET_SHARED_NETWORK_SUBNETS4,
+      MYSQL_GET_SUBNET4_ANY(WHERE s.shared_network_name = ?)
+    },
+
+    // Select pool by address range for a server.
+    { MySqlConfigBackendDHCPv4Impl::GET_POOL4_RANGE,
+      MYSQL_GET_POOL4_RANGE_WITH_TAG(WHERE (srv.tag = ? OR srv.id = 1) AND p.start_address = ? \
+                                     AND p.end_address = ?)
+    },
+
+    // Select pool by address range for any server.
+    { MySqlConfigBackendDHCPv4Impl::GET_POOL4_RANGE_ANY,
+      MYSQL_GET_POOL4_RANGE_NO_TAG(WHERE p.start_address = ? AND p.end_address = ?)
+    },
+
+    // Select shared network by name.
+    { MySqlConfigBackendDHCPv4Impl::GET_SHARED_NETWORK4_NAME_NO_TAG,
+      MYSQL_GET_SHARED_NETWORK4_NO_TAG(WHERE n.name = ?)
+    },
+
+    // Select shared network by name without specifying server tags.
+    { MySqlConfigBackendDHCPv4Impl::GET_SHARED_NETWORK4_NAME_ANY,
+      MYSQL_GET_SHARED_NETWORK4_ANY(WHERE n.name = ?)
+    },
+
+    // Select unassigned shared network by name.
+    { MySqlConfigBackendDHCPv4Impl::GET_SHARED_NETWORK4_NAME_UNASSIGNED,
+      MYSQL_GET_SHARED_NETWORK4_UNASSIGNED(AND n.name = ?)
+    },
+
+    // Select all shared networks.
+    { MySqlConfigBackendDHCPv4Impl::GET_ALL_SHARED_NETWORKS4,
+      MYSQL_GET_SHARED_NETWORK4_NO_TAG()
+    },
+
+    // Select all unassigned shared networks.
+    { MySqlConfigBackendDHCPv4Impl::GET_ALL_SHARED_NETWORKS4_UNASSIGNED,
+      MYSQL_GET_SHARED_NETWORK4_UNASSIGNED()
+    },
+
+    // Select modified shared networks.
+    { MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_SHARED_NETWORKS4,
+      MYSQL_GET_SHARED_NETWORK4_NO_TAG(WHERE n.modification_ts >= ?)
+    },
+
+    // Select modified and unassigned shared networks.
+    { MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_SHARED_NETWORKS4_UNASSIGNED,
+      MYSQL_GET_SHARED_NETWORK4_UNASSIGNED(AND n.modification_ts >= ?)
+    },
+
+    // Retrieves option definition by code and space.
+    { MySqlConfigBackendDHCPv4Impl::GET_OPTION_DEF4_CODE_SPACE,
+      MYSQL_GET_OPTION_DEF(dhcp4, AND d.code = ? AND d.space = ?)
+    },
+
+    // Retrieves all option definitions.
+    { MySqlConfigBackendDHCPv4Impl::GET_ALL_OPTION_DEFS4,
+      MYSQL_GET_OPTION_DEF(dhcp4)
+    },
+
+    // Retrieves modified option definitions.
+    { MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_OPTION_DEFS4,
+      MYSQL_GET_OPTION_DEF(dhcp4, AND d.modification_ts >= ?)
+    },
+
+    // Retrieves global option by code and space.
+    { MySqlConfigBackendDHCPv4Impl::GET_OPTION4_CODE_SPACE,
+      MYSQL_GET_OPTION4(AND o.scope_id = 0 AND o.code = ? AND o.space = ?)
+    },
+
+    // Retrieves all global options.
+    { MySqlConfigBackendDHCPv4Impl::GET_ALL_OPTIONS4,
+      MYSQL_GET_OPTION4(AND o.scope_id = 0)
+    },
+
+    // Retrieves modified options.
+    { MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_OPTIONS4,
+      MYSQL_GET_OPTION4(AND o.scope_id = 0 AND o.modification_ts >= ?)
+    },
+
+    // Retrieves an option for a given subnet, option code and space.
+    { MySqlConfigBackendDHCPv4Impl::GET_OPTION4_SUBNET_ID_CODE_SPACE,
+      MYSQL_GET_OPTION4(AND o.scope_id = 1 AND o.dhcp4_subnet_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Retrieves an option for a given pool, option code and space.
+    { MySqlConfigBackendDHCPv4Impl::GET_OPTION4_POOL_ID_CODE_SPACE,
+      MYSQL_GET_OPTION4(AND o.scope_id = 5 AND o.pool_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Retrieves an option for a given shared network, option code and space.
+    { MySqlConfigBackendDHCPv4Impl::GET_OPTION4_SHARED_NETWORK_CODE_SPACE,
+      MYSQL_GET_OPTION4(AND o.scope_id = 4 AND o.shared_network_name = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Select a client class by name.
+    { MySqlConfigBackendDHCPv4Impl::GET_CLIENT_CLASS4_NAME,
+      MYSQL_GET_CLIENT_CLASS4_WITH_TAG(WHERE c.name = ?)
+    },
+
+    // Select all client classes.
+    { MySqlConfigBackendDHCPv4Impl::GET_ALL_CLIENT_CLASSES4,
+      MYSQL_GET_CLIENT_CLASS4_WITH_TAG()
+    },
+
+    // Select all unassigned client classes.
+    { MySqlConfigBackendDHCPv4Impl::GET_ALL_CLIENT_CLASSES4_UNASSIGNED,
+      MYSQL_GET_CLIENT_CLASS4_UNASSIGNED()
+    },
+
+    // Select modified client classes.
+    { MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_CLIENT_CLASSES4,
+      MYSQL_GET_CLIENT_CLASS4_WITH_TAG(WHERE c.modification_ts >= ?)
+    },
+
+    // Select modified client classes.
+    { MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_CLIENT_CLASSES4_UNASSIGNED,
+      MYSQL_GET_CLIENT_CLASS4_UNASSIGNED(AND c.modification_ts >= ?)
+    },
+
+    // Retrieves the most recent audit entries.
+    { MySqlConfigBackendDHCPv4Impl::GET_AUDIT_ENTRIES4_TIME,
+      MYSQL_GET_AUDIT_ENTRIES_TIME(dhcp4)
+    },
+
+    // Retrieves a server by tag.
+    { MySqlConfigBackendDHCPv4Impl::GET_SERVER4,
+      MYSQL_GET_SERVER(dhcp4)
+    },
+
+    // Retrieves all servers.
+    { MySqlConfigBackendDHCPv4Impl::GET_ALL_SERVERS4,
+      MYSQL_GET_ALL_SERVERS(dhcp4)
+    },
+
+    // Insert global parameter.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_GLOBAL_PARAMETER4,
+      MYSQL_INSERT_GLOBAL_PARAMETER(dhcp4)
+    },
+
+    // Insert association of the global parameter with a server.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_GLOBAL_PARAMETER4_SERVER,
+      MYSQL_INSERT_GLOBAL_PARAMETER_SERVER(dhcp4)
+    },
+
+    // Insert a subnet.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_SUBNET4,
+      "INSERT INTO dhcp4_subnet("
+      "  subnet_id,"
+      "  subnet_prefix,"
+      "  4o6_interface,"
+      "  4o6_interface_id,"
+      "  4o6_subnet,"
+      "  boot_file_name,"
+      "  client_class,"
+      "  interface,"
+      "  match_client_id,"
+      "  modification_ts,"
+      "  next_server,"
+      "  rebind_timer,"
+      "  relay,"
+      "  renew_timer,"
+      "  require_client_classes,"
+      "  reservations_global,"
+      "  server_hostname,"
+      "  shared_network_name,"
+      "  user_context,"
+      "  valid_lifetime,"
+      "  min_valid_lifetime,"
+      "  max_valid_lifetime,"
+      "  calculate_tee_times,"
+      "  t1_percent,"
+      "  t2_percent,"
+      "  authoritative,"
+      "  ddns_send_updates,"
+      "  ddns_override_no_update,"
+      "  ddns_override_client_update,"
+      "  ddns_replace_client_name,"
+      "  ddns_generated_prefix,"
+      "  ddns_qualifying_suffix,"
+      "  reservations_in_subnet,"
+      "  reservations_out_of_pool,"
+      "  cache_threshold,"
+      "  cache_max_age,"
+      "  offer_lifetime,"
+      "  allocator"
+      ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?,"
+      " ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)" },
+
+    // Insert association of the subnet with a server.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_SUBNET4_SERVER,
+      MYSQL_INSERT_SUBNET_SERVER(dhcp4)
+    },
+
+    // Insert pool for a subnet.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_POOL4,
+      MYSQL_INSERT_POOL(dhcp4)
+    },
+
+    // Insert a shared network.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_SHARED_NETWORK4,
+      "INSERT INTO dhcp4_shared_network("
+      "  name,"
+      "  client_class,"
+      "  interface,"
+      "  match_client_id,"
+      "  modification_ts,"
+      "  rebind_timer,"
+      "  relay,"
+      "  renew_timer,"
+      "  require_client_classes,"
+      "  reservations_global,"
+      "  user_context,"
+      "  valid_lifetime,"
+      "  min_valid_lifetime,"
+      "  max_valid_lifetime,"
+      "  calculate_tee_times,"
+      "  t1_percent,"
+      "  t2_percent,"
+      "  authoritative,"
+      "  boot_file_name,"
+      "  next_server,"
+      "  server_hostname,"
+      "  ddns_send_updates,"
+      "  ddns_override_no_update,"
+      "  ddns_override_client_update,"
+      "  ddns_replace_client_name,"
+      "  ddns_generated_prefix,"
+      "  ddns_qualifying_suffix,"
+      "  reservations_in_subnet,"
+      "  reservations_out_of_pool,"
+      "  cache_threshold,"
+      "  cache_max_age,"
+      "  offer_lifetime,"
+      "  allocator"
+      ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?,"
+      " ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)" },
+
+    // Insert association of the shared network with a server.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_SHARED_NETWORK4_SERVER,
+      MYSQL_INSERT_SHARED_NETWORK_SERVER(dhcp4)
+    },
+
+    // Insert option definition.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4,
+      MYSQL_INSERT_OPTION_DEF(dhcp4)
+    },
+
+    // Insert option definition for client class.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4_CLIENT_CLASS,
+      MYSQL_INSERT_OPTION_DEF_CLIENT_CLASS(dhcp4)
+    },
+
+    // Insert association of the option definition with a server.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4_SERVER,
+      MYSQL_INSERT_OPTION_DEF_SERVER(dhcp4)
+    },
+
+    // Insert subnet specific option.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_OPTION4,
+      MYSQL_INSERT_OPTION4()
+    },
+
+    // Insert association of the DHCP option with a server.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_OPTION4_SERVER,
+      MYSQL_INSERT_OPTION_SERVER(dhcp4)
+    },
+
+    // Insert client class.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4,
+      "INSERT INTO dhcp4_client_class("
+      "  name,"
+      "  test,"
+      "  next_server,"
+      "  server_hostname,"
+      "  boot_file_name,"
+      "  only_if_required,"
+      "  valid_lifetime,"
+      "  min_valid_lifetime,"
+      "  max_valid_lifetime,"
+      "  depend_on_known_directly,"
+      "  follow_class_name,"
+      "  modification_ts,"
+      "  user_context, "
+      "  offer_lifetime "
+      ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
+    },
+
+    // Insert association of a client class with a server.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4_SERVER,
+      MYSQL_INSERT_CLIENT_CLASS_SERVER(dhcp4)
+    },
+
+    // Insert client class dependency.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4_DEPENDENCY,
+      MYSQL_INSERT_CLIENT_CLASS_DEPENDENCY(dhcp4)
+    },
+
+    // Insert server with server tag and description.
+    { MySqlConfigBackendDHCPv4Impl::INSERT_SERVER4,
+      MYSQL_INSERT_SERVER(dhcp4)
+    },
+
+    // Update existing global parameter.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_GLOBAL_PARAMETER4,
+      MYSQL_UPDATE_GLOBAL_PARAMETER(dhcp4)
+    },
+
+    // Update existing subnet.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_SUBNET4,
+      "UPDATE dhcp4_subnet SET"
+      "  subnet_id = ?,"
+      "  subnet_prefix = ?,"
+      "  4o6_interface = ?,"
+      "  4o6_interface_id = ?,"
+      "  4o6_subnet = ?,"
+      "  boot_file_name = ?,"
+      "  client_class = ?,"
+      "  interface = ?,"
+      "  match_client_id = ?,"
+      "  modification_ts = ?,"
+      "  next_server = ?,"
+      "  rebind_timer = ?,"
+      "  relay = ?,"
+      "  renew_timer = ?,"
+      "  require_client_classes = ?,"
+      "  reservations_global = ?,"
+      "  server_hostname = ?,"
+      "  shared_network_name = ?,"
+      "  user_context = ?,"
+      "  valid_lifetime = ?,"
+      "  min_valid_lifetime = ?,"
+      "  max_valid_lifetime = ?,"
+      "  calculate_tee_times = ?,"
+      "  t1_percent = ?,"
+      "  t2_percent = ?,"
+      "  authoritative = ?,"
+      "  ddns_send_updates = ?,"
+      "  ddns_override_no_update = ?,"
+      "  ddns_override_client_update = ?,"
+      "  ddns_replace_client_name = ?,"
+      "  ddns_generated_prefix = ?,"
+      "  ddns_qualifying_suffix = ?,"
+      "  reservations_in_subnet = ?,"
+      "  reservations_out_of_pool = ?,"
+      "  cache_threshold = ?,"
+      "  cache_max_age = ?, "
+      "  offer_lifetime = ?, "
+      "  allocator = ? "
+      "WHERE subnet_id = ? OR subnet_prefix = ?" },
+
+    // Update existing shared network.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_SHARED_NETWORK4,
+      "UPDATE dhcp4_shared_network SET"
+      "  name = ?,"
+      "  client_class = ?,"
+      "  interface = ?,"
+      "  match_client_id = ?,"
+      "  modification_ts = ?,"
+      "  rebind_timer = ?,"
+      "  relay = ?,"
+      "  renew_timer = ?,"
+      "  require_client_classes = ?,"
+      "  reservations_global = ?,"
+      "  user_context = ?,"
+      "  valid_lifetime = ?,"
+      "  min_valid_lifetime = ?,"
+      "  max_valid_lifetime = ?,"
+      "  calculate_tee_times = ?,"
+      "  t1_percent = ?,"
+      "  t2_percent = ?,"
+      "  authoritative = ?,"
+      "  boot_file_name = ?,"
+      "  next_server = ?,"
+      "  server_hostname = ?,"
+      "  ddns_send_updates = ?,"
+      "  ddns_override_no_update = ?,"
+      "  ddns_override_client_update = ?,"
+      "  ddns_replace_client_name = ?,"
+      "  ddns_generated_prefix = ?,"
+      "  ddns_qualifying_suffix = ?,"
+      "  reservations_in_subnet = ?,"
+      "  reservations_out_of_pool = ?,"
+      "  cache_threshold = ?,"
+      "  cache_max_age = ?,"
+      "  offer_lifetime = ?, "
+      "  allocator = ? "
+      "WHERE name = ?" },
+
+    // Update existing option definition.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION_DEF4,
+      MYSQL_UPDATE_OPTION_DEF(dhcp4)
+    },
+
+    // Update existing client class option definition.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION_DEF4_CLIENT_CLASS,
+      MYSQL_UPDATE_OPTION_DEF_CLIENT_CLASS(dhcp4)
+    },
+
+    // Update existing global option.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION4,
+      MYSQL_UPDATE_OPTION4_WITH_TAG(AND o.scope_id = 0 AND o.code = ? AND o.space = ?)
+    },
+
+    // Update existing subnet level option.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_SUBNET_ID,
+      MYSQL_UPDATE_OPTION4_NO_TAG(o.scope_id = 1 AND o.dhcp4_subnet_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Update existing pool level option.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_POOL_ID,
+      MYSQL_UPDATE_OPTION4_NO_TAG(o.scope_id = 5 AND o.pool_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Update existing shared network level option.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_SHARED_NETWORK,
+      MYSQL_UPDATE_OPTION4_NO_TAG(o.scope_id = 4 AND o.shared_network_name = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Update existing client class level option.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_CLIENT_CLASS,
+      MYSQL_UPDATE_OPTION4_NO_TAG(o.scope_id = 2 AND o.dhcp_client_class = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Update existing client class with specifying its position.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_CLIENT_CLASS4,
+      MYSQL_UPDATE_CLIENT_CLASS4("follow_class_name = ?,")
+    },
+
+    // Update existing client class without specifying its position.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_CLIENT_CLASS4_SAME_POSITION,
+      MYSQL_UPDATE_CLIENT_CLASS4("")
+    },
+
+    // Update existing server, e.g. server description.
+    { MySqlConfigBackendDHCPv4Impl::UPDATE_SERVER4,
+      MYSQL_UPDATE_SERVER(dhcp4)
+    },
+
+    // Delete global parameter by name.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_GLOBAL_PARAMETER4,
+      MYSQL_DELETE_GLOBAL_PARAMETER(dhcp4, AND g.name = ?)
+    },
+
+    // Delete all global parameters.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_GLOBAL_PARAMETERS4,
+      MYSQL_DELETE_GLOBAL_PARAMETER(dhcp4)
+    },
+
+    // Delete all global parameters which are unassigned to any servers.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_GLOBAL_PARAMETERS4_UNASSIGNED,
+      MYSQL_DELETE_GLOBAL_PARAMETER_UNASSIGNED(dhcp4)
+    },
+
+    // Delete subnet by id with specifying server tag.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_ID_WITH_TAG,
+      MYSQL_DELETE_SUBNET_WITH_TAG(dhcp4, AND s.subnet_id = ?)
+    },
+
+    // Delete subnet by id without specifying server tag.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_ID_ANY,
+      MYSQL_DELETE_SUBNET_ANY(dhcp4, WHERE s.subnet_id = ?)
+    },
+
+    // Delete subnet by prefix with specifying server tag.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_PREFIX_WITH_TAG,
+      MYSQL_DELETE_SUBNET_WITH_TAG(dhcp4, AND s.subnet_prefix = ?)
+    },
+
+    // Delete subnet by prefix without specifying server tag.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_PREFIX_ANY,
+      MYSQL_DELETE_SUBNET_ANY(dhcp4, WHERE s.subnet_prefix = ?)
+    },
+
+    // Delete all subnets.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4,
+      MYSQL_DELETE_SUBNET_WITH_TAG(dhcp4)
+    },
+
+    // Delete all unassigned subnets.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4_UNASSIGNED,
+      MYSQL_DELETE_SUBNET_UNASSIGNED(dhcp4)
+    },
+
+    // Delete all subnets for a shared network.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4_SHARED_NETWORK_NAME,
+      MYSQL_DELETE_SUBNET_ANY(dhcp4, WHERE s.shared_network_name = ?)
+    },
+
+    // Delete associations of a subnet with server.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_SERVER,
+      MYSQL_DELETE_SUBNET_SERVER(dhcp4),
+    },
+
+    // Delete pools for a subnet.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_POOLS4,
+      MYSQL_DELETE_POOLS(dhcp4)
+    },
+
+    // Delete shared network by name with specifying server tag.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_NAME_WITH_TAG,
+      MYSQL_DELETE_SHARED_NETWORK_WITH_TAG(dhcp4, AND n.name = ?)
+    },
+
+    // Delete shared network by name without specifying server tag.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_NAME_ANY,
+      MYSQL_DELETE_SHARED_NETWORK_ANY(dhcp4, WHERE n.name = ?)
+    },
+
+    // Delete all shared networks.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SHARED_NETWORKS4,
+      MYSQL_DELETE_SHARED_NETWORK_WITH_TAG(dhcp4)
+    },
+
+    // Delete all unassigned shared networks.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SHARED_NETWORKS4_UNASSIGNED,
+      MYSQL_DELETE_SHARED_NETWORK_UNASSIGNED(dhcp4)
+    },
+
+    // Delete associations of a shared network with server.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_SERVER,
+      MYSQL_DELETE_SHARED_NETWORK_SERVER(dhcp4)
+    },
+
+    // Delete option definition.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_OPTION_DEF4_CODE_NAME,
+      MYSQL_DELETE_OPTION_DEF(dhcp4, AND code = ? AND space = ?)
+    },
+
+    // Delete all option definitions.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_OPTION_DEFS4,
+      MYSQL_DELETE_OPTION_DEF(dhcp4)
+    },
+
+    // Delete all option definitions which are assigned to no servers.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_OPTION_DEFS4_UNASSIGNED,
+      MYSQL_DELETE_OPTION_DEF_UNASSIGNED(dhcp4)
+    },
+
+    // Delete client class specific option definitions.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_OPTION_DEFS4_CLIENT_CLASS,
+      MYSQL_DELETE_OPTION_DEFS_CLIENT_CLASS(dhcp4)
+    },
+
+    // Delete single global option.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_OPTION4,
+      MYSQL_DELETE_OPTION_WITH_TAG(dhcp4, AND o.scope_id = 0  AND o.code = ? AND o.space = ?)
+    },
+
+    // Delete all global options which are unassigned to any servers.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_GLOBAL_OPTIONS4_UNASSIGNED,
+      MYSQL_DELETE_OPTION_UNASSIGNED(dhcp4, AND o.scope_id = 0)
+    },
+
+    // Delete single option from a subnet.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_OPTION4_SUBNET_ID,
+      MYSQL_DELETE_OPTION_NO_TAG(dhcp4,
+                          WHERE o.scope_id = 1 AND o.dhcp4_subnet_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Delete single option from a pool.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_OPTION4_POOL_RANGE,
+      MYSQL_DELETE_OPTION_POOL_RANGE(dhcp4, o.scope_id = 5 AND o.code = ? AND o.space = ?)
+    },
+
+    // Delete single option from a shared network.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_OPTION4_SHARED_NETWORK,
+      MYSQL_DELETE_OPTION_NO_TAG(dhcp4,
+                          WHERE o.scope_id = 4 AND o.shared_network_name = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Delete options belonging to a subnet.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_OPTIONS4_SUBNET_ID_PREFIX,
+      MYSQL_DELETE_OPTION_SUBNET_ID_PREFIX(dhcp4)
+    },
+
+    // Delete options belonging to a shared_network.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_OPTIONS4_SHARED_NETWORK,
+      MYSQL_DELETE_OPTION_NO_TAG(dhcp4, WHERE o.scope_id = 4 AND o.shared_network_name = ?)
+    },
+
+    // Delete options belonging to a client class.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_OPTIONS4_CLIENT_CLASS,
+      MYSQL_DELETE_OPTION_NO_TAG(dhcp4, WHERE o.scope_id = 2 AND o.dhcp_client_class = ?)
+    },
+
+    // Delete all dependencies of a client class.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_DEPENDENCY,
+      MYSQL_DELETE_CLIENT_CLASS_DEPENDENCY(dhcp4)
+    },
+
+    // Delete associations of a client class with server.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_SERVER,
+      MYSQL_DELETE_CLIENT_CLASS_SERVER(dhcp4),
+    },
+
+    // Delete all client classes.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_CLIENT_CLASSES4,
+      MYSQL_DELETE_CLIENT_CLASS_WITH_TAG(dhcp4)
+    },
+
+    // Delete all unassigned client classes.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_CLIENT_CLASSES4_UNASSIGNED,
+      MYSQL_DELETE_CLIENT_CLASS_UNASSIGNED(dhcp4)
+    },
+
+    // Delete specified client class.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4,
+      MYSQL_DELETE_CLIENT_CLASS_WITH_TAG(dhcp4, AND name = ?)
+    },
+
+    // Delete any client class with a given name.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_ANY,
+      MYSQL_DELETE_CLIENT_CLASS_ANY(dhcp4, AND name = ?)
+    },
+
+    // Delete a server by tag.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_SERVER4,
+      MYSQL_DELETE_SERVER(dhcp4)
+    },
+
+    // Deletes all servers except logical server 'all'.
+    { MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SERVERS4,
+      MYSQL_DELETE_ALL_SERVERS(dhcp4)
+    }
+}
+};
+
+} // end anonymous namespace
+
+MySqlConfigBackendDHCPv4Impl::MySqlConfigBackendDHCPv4Impl(const DatabaseConnection::ParameterMap& parameters)
+    : MySqlConfigBackendImpl(parameters, &MySqlConfigBackendDHCPv4Impl::dbReconnect) {
+    // Prepare query statements. Those are will be only used to retrieve
+    // information from the database, so they can be used even if the
+    // database is read only for the current user.
+    conn_.prepareStatements(tagged_statements.begin(),
+                            tagged_statements.end());
+// @todo As part of enabling read-only CB access, statements need to
+// be limited:
+//                            tagged_statements.begin() + WRITE_STMTS_BEGIN);
+
+    // Create unique timer name per instance.
+    timer_name_ = "MySqlConfigBackend4[";
+    timer_name_ += boost::lexical_cast<std::string>(reinterpret_cast<uint64_t>(this));
+    timer_name_ += "]DbReconnectTimer";
+
+    // Create ReconnectCtl for this connection.
+    conn_.makeReconnectCtl(timer_name_);
+}
+
+MySqlConfigBackendDHCPv4Impl::~MySqlConfigBackendDHCPv4Impl() {
+}
+
+MySqlConfigBackendDHCPv4::MySqlConfigBackendDHCPv4(const DatabaseConnection::ParameterMap& parameters)
+    : impl_(new MySqlConfigBackendDHCPv4Impl(parameters)), base_impl_(impl_) {
+}
+
+bool
+MySqlConfigBackendDHCPv4::isUnusable() {
+    return (impl_->conn_.isUnusable());
+}
+
+DatabaseConnection::ParameterMap
+MySqlConfigBackendDHCPv4::getParameters() const {
+    return (impl_->getParameters());
+}
+
+Subnet4Ptr
+MySqlConfigBackendDHCPv4::getSubnet4(const ServerSelector& server_selector,
+                                     const std::string& subnet_prefix) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SUBNET4_BY_PREFIX)
+        .arg(subnet_prefix);
+    return (impl_->getSubnet4(server_selector, subnet_prefix));
+}
+
+Subnet4Ptr
+MySqlConfigBackendDHCPv4::getSubnet4(const ServerSelector& server_selector,
+                                     const SubnetID& subnet_id) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SUBNET4_BY_SUBNET_ID)
+        .arg(subnet_id);
+    return (impl_->getSubnet4(server_selector, subnet_id));
+}
+
+Subnet4Collection
+MySqlConfigBackendDHCPv4::getAllSubnets4(const ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SUBNETS4);
+    Subnet4Collection subnets;
+    impl_->getAllSubnets4(server_selector, subnets);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SUBNETS4_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+Subnet4Collection
+MySqlConfigBackendDHCPv4::getModifiedSubnets4(const ServerSelector& server_selector,
+                                              const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_SUBNETS4)
+        .arg(util::ptimeToText(modification_time));
+    Subnet4Collection subnets;
+    impl_->getModifiedSubnets4(server_selector, modification_time, subnets);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_SUBNETS4_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+Subnet4Collection
+MySqlConfigBackendDHCPv4::getSharedNetworkSubnets4(const ServerSelector& /* server_selector */,
+                                                   const std::string& shared_network_name) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4)
+        .arg(shared_network_name);
+    Subnet4Collection subnets;
+    impl_->getSharedNetworkSubnets4(ServerSelector::ANY(), shared_network_name, subnets);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+SharedNetwork4Ptr
+MySqlConfigBackendDHCPv4::getSharedNetwork4(const ServerSelector& server_selector,
+                                            const std::string& name) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SHARED_NETWORK4)
+        .arg(name);
+    return (impl_->getSharedNetwork4(server_selector, name));
+}
+
+SharedNetwork4Collection
+MySqlConfigBackendDHCPv4::getAllSharedNetworks4(const ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SHARED_NETWORKS4);
+    SharedNetwork4Collection shared_networks;
+    impl_->getAllSharedNetworks4(server_selector, shared_networks);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT)
+        .arg(shared_networks.size());
+    return (shared_networks);
+}
+
+SharedNetwork4Collection
+MySqlConfigBackendDHCPv4::getModifiedSharedNetworks4(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4)
+        .arg(util::ptimeToText(modification_time));
+    SharedNetwork4Collection shared_networks;
+    impl_->getModifiedSharedNetworks4(server_selector, modification_time, shared_networks);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT)
+        .arg(shared_networks.size());
+    return (shared_networks);
+}
+
+OptionDefinitionPtr
+MySqlConfigBackendDHCPv4::getOptionDef4(const ServerSelector& server_selector,
+                                        const uint16_t code,
+                                        const std::string& space) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_OPTION_DEF4)
+        .arg(code).arg(space);
+    return (impl_->getOptionDef(MySqlConfigBackendDHCPv4Impl::GET_OPTION_DEF4_CODE_SPACE,
+                                server_selector, code, space));
+}
+
+OptionDefContainer
+MySqlConfigBackendDHCPv4::getAllOptionDefs4(const ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_OPTION_DEFS4);
+    OptionDefContainer option_defs;
+    impl_->getAllOptionDefs(MySqlConfigBackendDHCPv4Impl::GET_ALL_OPTION_DEFS4,
+                            server_selector, option_defs);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_OPTION_DEFS4_RESULT)
+        .arg(option_defs.size());
+    return (option_defs);
+}
+
+OptionDefContainer
+MySqlConfigBackendDHCPv4::getModifiedOptionDefs4(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_OPTION_DEFS4)
+        .arg(util::ptimeToText(modification_time));
+    OptionDefContainer option_defs;
+    impl_->getModifiedOptionDefs(MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_OPTION_DEFS4,
+                                 server_selector, modification_time, option_defs);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT)
+        .arg(option_defs.size());
+    return (option_defs);
+}
+
+OptionDescriptorPtr
+MySqlConfigBackendDHCPv4::getOption4(const ServerSelector& server_selector,
+                                     const uint16_t code,
+                                     const std::string& space) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_OPTION4)
+        .arg(code).arg(space);
+    return (impl_->getOption(MySqlConfigBackendDHCPv4Impl::GET_OPTION4_CODE_SPACE,
+                             Option::V4, server_selector, code, space));
+}
+
+OptionContainer
+MySqlConfigBackendDHCPv4::getAllOptions4(const ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_OPTIONS4);
+    OptionContainer options = impl_->getAllOptions(MySqlConfigBackendDHCPv4Impl::GET_ALL_OPTIONS4,
+            Option::V4, server_selector);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_OPTIONS4_RESULT)
+        .arg(options.size());
+    return (options);
+}
+
+OptionContainer
+MySqlConfigBackendDHCPv4::getModifiedOptions4(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_OPTIONS4)
+        .arg(util::ptimeToText(modification_time));
+    OptionContainer options = impl_->getModifiedOptions(MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_OPTIONS4,
+            Option::V4, server_selector, modification_time);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_OPTIONS4_RESULT)
+        .arg(options.size());
+    return (options);
+}
+
+StampedValuePtr
+MySqlConfigBackendDHCPv4::getGlobalParameter4(const ServerSelector& server_selector,
+                                              const std::string& name) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_GLOBAL_PARAMETER4)
+        .arg(name);
+    return (impl_->getGlobalParameter4(server_selector, name));
+}
+
+StampedValueCollection
+MySqlConfigBackendDHCPv4::getAllGlobalParameters4(const ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4);
+    StampedValueCollection parameters;
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        MySqlBindingCollection in_bindings = { MySqlBinding::createString(tag.get()) };
+        impl_->getGlobalParameters(MySqlConfigBackendDHCPv4Impl::GET_ALL_GLOBAL_PARAMETERS4,
+                                   in_bindings, parameters);
+    }
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT)
+        .arg(parameters.size());
+    return (parameters);
+}
+
+StampedValueCollection
+MySqlConfigBackendDHCPv4::getModifiedGlobalParameters4(const db::ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4)
+        .arg(util::ptimeToText(modification_time));
+    StampedValueCollection parameters;
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(tag.get()),
+            MySqlBinding::createTimestamp(modification_time)
+        };
+        impl_->getGlobalParameters(MySqlConfigBackendDHCPv4Impl::GET_MODIFIED_GLOBAL_PARAMETERS4,
+                                   in_bindings, parameters);
+    }
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT)
+        .arg(parameters.size());
+    return (parameters);
+}
+
+ClientClassDefPtr
+MySqlConfigBackendDHCPv4::getClientClass4(const db::ServerSelector& server_selector,
+                                          const std::string& name) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_CLIENT_CLASS4)
+        .arg(name);
+    return (impl_->getClientClass4(server_selector, name));
+}
+
+ClientClassDictionary
+MySqlConfigBackendDHCPv4::getAllClientClasses4(const db::ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_CLIENT_CLASSES4);
+    ClientClassDictionary client_classes;
+    impl_->getAllClientClasses4(server_selector, client_classes);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT)
+        .arg(client_classes.getClasses()->size());
+    return (client_classes);
+}
+
+ClientClassDictionary
+MySqlConfigBackendDHCPv4::getModifiedClientClasses4(const db::ServerSelector& server_selector,
+                                                    const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4)
+        .arg(util::ptimeToText(modification_time));
+    ClientClassDictionary client_classes;
+    impl_->getModifiedClientClasses4(server_selector, modification_time, client_classes);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT)
+        .arg(client_classes.getClasses()->size());
+    return (client_classes);
+}
+
+AuditEntryCollection
+MySqlConfigBackendDHCPv4::getRecentAuditEntries(const db::ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time,
+        const uint64_t& modification_id) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4)
+      .arg(util::ptimeToText(modification_time))
+      .arg(modification_id);
+    AuditEntryCollection audit_entries;
+    impl_->getRecentAuditEntries(MySqlConfigBackendDHCPv4Impl::GET_AUDIT_ENTRIES4_TIME,
+                                 server_selector, modification_time,
+                                 modification_id, audit_entries);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT)
+        .arg(audit_entries.size());
+    return (audit_entries);
+}
+
+ServerCollection
+MySqlConfigBackendDHCPv4::getAllServers4() const {
+    ServerCollection servers;
+
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SERVERS4);
+    impl_->getAllServers(MySqlConfigBackendDHCPv4Impl::GET_ALL_SERVERS4,
+                         servers);
+
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SERVERS4_RESULT)
+        .arg(servers.size());
+    return (servers);
+}
+
+ServerPtr
+MySqlConfigBackendDHCPv4::getServer4(const data::ServerTag& server_tag) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SERVER4)
+        .arg(server_tag.get());
+    return (impl_->getServer(MySqlConfigBackendDHCPv4Impl::GET_SERVER4, server_tag));
+}
+
+void
+MySqlConfigBackendDHCPv4::createUpdateSubnet4(const ServerSelector& server_selector,
+                                              const Subnet4Ptr& subnet) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_SUBNET4)
+        .arg(subnet);
+    impl_->createUpdateSubnet4(server_selector, subnet);
+}
+
+void
+MySqlConfigBackendDHCPv4::createUpdateSharedNetwork4(const ServerSelector& server_selector,
+                                                     const SharedNetwork4Ptr& shared_network) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK4)
+        .arg(shared_network->getName());
+    impl_->createUpdateSharedNetwork4(server_selector, shared_network);
+}
+
+void
+MySqlConfigBackendDHCPv4::createUpdateOptionDef4(const ServerSelector& server_selector,
+                                                 const OptionDefinitionPtr& option_def) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_OPTION_DEF4)
+        .arg(option_def->getName()).arg(option_def->getCode());
+    impl_->createUpdateOptionDef4(server_selector, option_def);
+}
+
+void
+MySqlConfigBackendDHCPv4::createUpdateOption4(const ServerSelector& server_selector,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_OPTION4);
+    impl_->createUpdateOption4(server_selector, option);
+}
+
+void
+MySqlConfigBackendDHCPv4::createUpdateOption4(const db::ServerSelector& server_selector,
+                                              const std::string& shared_network_name,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4)
+        .arg(shared_network_name);
+    impl_->createUpdateOption4(server_selector, shared_network_name, option, false);
+}
+
+void
+MySqlConfigBackendDHCPv4::createUpdateOption4(const ServerSelector& server_selector,
+                                              const SubnetID& subnet_id,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4)
+        .arg(subnet_id);
+    impl_->createUpdateOption4(server_selector, subnet_id, option, false);
+}
+
+void
+MySqlConfigBackendDHCPv4::createUpdateOption4(const ServerSelector& server_selector,
+                                              const asiolink::IOAddress& pool_start_address,
+                                              const asiolink::IOAddress& pool_end_address,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4)
+        .arg(pool_start_address.toText()).arg(pool_end_address.toText());
+    impl_->createUpdateOption4(server_selector, pool_start_address, pool_end_address,
+                               option);
+}
+
+void
+MySqlConfigBackendDHCPv4::createUpdateGlobalParameter4(const ServerSelector& server_selector,
+                                                       const StampedValuePtr& value) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4)
+        .arg(value->getName());
+    impl_->createUpdateGlobalParameter4(server_selector, value);
+}
+
+void
+MySqlConfigBackendDHCPv4::createUpdateClientClass4(const db::ServerSelector& server_selector,
+                                                   const ClientClassDefPtr& client_class,
+                                                   const std::string& follow_class_name) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS4)
+        .arg(client_class->getName());
+    impl_->createUpdateClientClass4(server_selector, client_class, follow_class_name);
+}
+
+void
+MySqlConfigBackendDHCPv4::createUpdateServer4(const ServerPtr& server) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_SERVER4)
+        .arg(server->getServerTagAsText());
+    impl_->createUpdateServer(MySqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                              MySqlConfigBackendDHCPv4Impl::INSERT_SERVER4,
+                              MySqlConfigBackendDHCPv4Impl::UPDATE_SERVER4,
+                              server);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteSubnet4(const ServerSelector& server_selector,
+                                        const std::string& subnet_prefix) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_PREFIX_SUBNET4)
+        .arg(subnet_prefix);
+    uint64_t result = impl_->deleteSubnet4(server_selector, subnet_prefix);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteSubnet4(const ServerSelector& server_selector,
+                                        const SubnetID& subnet_id) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4)
+        .arg(subnet_id);
+    uint64_t result = impl_->deleteSubnet4(server_selector, subnet_id);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteAllSubnets4(const ServerSelector& server_selector) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SUBNETS4);
+
+    int index = (server_selector.amUnassigned() ?
+                 MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4_UNASSIGNED :
+                 MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all subnets",
+                                                 "deleted all subnets", true);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SUBNETS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteSharedNetworkSubnets4(const db::ServerSelector& server_selector,
+                                                      const std::string& shared_network_name) {
+    if (!server_selector.amAny()) {
+        isc_throw(InvalidOperation, "deleting all subnets from a shared "
+                  "network requires using ANY server selector");
+    }
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4)
+        .arg(shared_network_name);
+    uint64_t result = impl_->deleteTransactional(MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4_SHARED_NETWORK_NAME,
+                                                 server_selector,
+                                                 "deleting all subnets for a shared network",
+                                                 "deleted all subnets for a shared network",
+                                                 true, shared_network_name);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteSharedNetwork4(const ServerSelector& server_selector,
+                                               const std::string& name) {
+    /// @todo Using UNASSIGNED selector is allowed by the CB API but we don't have
+    /// dedicated query for this at the moment. The user should use ANY to delete
+    /// the shared network by name.
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "deleting an unassigned shared network requires "
+                  "an explicit server tag or using ANY server. The UNASSIGNED server "
+                  "selector is currently not supported");
+    }
+
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK4)
+        .arg(name);
+
+    int index = (server_selector.amAny() ?
+                 MySqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_NAME_ANY :
+                 MySqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_NAME_WITH_TAG);
+    uint64_t result = impl_->deleteTransactional(index, server_selector,
+                                                 "deleting a shared network",
+                                                 "shared network deleted", true, name);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteAllSharedNetworks4(const ServerSelector& server_selector) {
+    if (server_selector.amAny()) {
+        isc_throw(InvalidOperation, "deleting all shared networks for ANY server is not"
+                  " supported");
+    }
+
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4);
+
+    int index = (server_selector.amUnassigned() ?
+                 MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SHARED_NETWORKS4_UNASSIGNED :
+                 MySqlConfigBackendDHCPv4Impl::DELETE_ALL_SHARED_NETWORKS4);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all shared networks",
+                                                 "deleted all shared networks", true);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteOptionDef4(const ServerSelector& server_selector,
+                                           const uint16_t code,
+                                           const std::string& space) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_OPTION_DEF4)
+        .arg(code).arg(space);
+    uint64_t result = impl_->deleteOptionDef4(server_selector, code, space);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_OPTION_DEF4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteAllOptionDefs4(const ServerSelector& server_selector) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_OPTION_DEFS4);
+    uint64_t result = impl_->deleteTransactional(MySqlConfigBackendDHCPv4Impl::DELETE_ALL_OPTION_DEFS4,
+                                                 server_selector, "deleting all option definitions",
+                                                 "deleted all option definitions", true);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteOption4(const ServerSelector& server_selector,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_OPTION4)
+        .arg(code).arg(space);
+    uint64_t result = impl_->deleteOption4(server_selector, code, space);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_OPTION4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteOption4(const ServerSelector& /* server_selector */,
+                                        const std::string& shared_network_name,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4)
+        .arg(shared_network_name).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption4(ServerSelector::ANY(), shared_network_name,
+                                           code, space);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteOption4(const ServerSelector& /* server_selector */,
+                                        const SubnetID& subnet_id,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4)
+        .arg(subnet_id).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption4(ServerSelector::ANY(), subnet_id, code, space);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteOption4(const ServerSelector& /* server_selector */,
+                                        const asiolink::IOAddress& pool_start_address,
+                                        const asiolink::IOAddress& pool_end_address,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_POOL_OPTION4)
+        .arg(pool_start_address.toText()).arg(pool_end_address.toText()).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption4(ServerSelector::ANY(), pool_start_address,
+                                           pool_end_address, code, space);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_POOL_OPTION4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteGlobalParameter4(const ServerSelector& server_selector,
+                                                 const std::string& name) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_GLOBAL_PARAMETER4)
+        .arg(name);
+    uint64_t result = impl_->deleteTransactional(MySqlConfigBackendDHCPv4Impl::DELETE_GLOBAL_PARAMETER4,
+                                                 server_selector, "deleting global parameter",
+                                                 "global parameter deleted", false, name);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteAllGlobalParameters4(const ServerSelector& server_selector) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4);
+    uint64_t result = impl_->deleteTransactional(MySqlConfigBackendDHCPv4Impl::DELETE_ALL_GLOBAL_PARAMETERS4,
+                                                 server_selector, "deleting all global parameters",
+                                                 "all global parameters deleted", true);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteClientClass4(const db::ServerSelector& server_selector,
+                                             const std::string& name) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_CLIENT_CLASS4)
+        .arg(name);
+    auto result = impl_->deleteClientClass4(server_selector, name);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_CLIENT_CLASS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteAllClientClasses4(const db::ServerSelector& server_selector) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4);
+
+    int index = (server_selector.amUnassigned() ?
+                 MySqlConfigBackendDHCPv4Impl::DELETE_ALL_CLIENT_CLASSES4_UNASSIGNED :
+                 MySqlConfigBackendDHCPv4Impl::DELETE_ALL_CLIENT_CLASSES4);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all client classes",
+                                                 "deleted all client classes", true);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteServer4(const ServerTag& server_tag) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SERVER4)
+        .arg(server_tag.get());
+    uint64_t result = impl_->deleteServer4(server_tag);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SERVER4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv4::deleteAllServers4() {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SERVERS4);
+    uint64_t result = impl_->deleteAllServers4();
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SERVERS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+std::string
+MySqlConfigBackendDHCPv4::getType() const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_TYPE4);
+    return (impl_->getType());
+}
+
+std::string
+MySqlConfigBackendDHCPv4::getHost() const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_HOST4);
+    return (impl_->getHost());
+}
+
+uint16_t
+MySqlConfigBackendDHCPv4::getPort() const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_PORT4);
+    return (impl_->getPort());
+}
+
+bool
+MySqlConfigBackendDHCPv4::registerBackendType() {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_REGISTER_BACKEND_TYPE4);
+    return (
+        dhcp::ConfigBackendDHCPv4Mgr::instance().registerBackendFactory("mysql",
+            [](const db::DatabaseConnection::ParameterMap& params) -> dhcp::ConfigBackendDHCPv4Ptr {
+            return (dhcp::MySqlConfigBackendDHCPv4Ptr(new dhcp::MySqlConfigBackendDHCPv4(params)));
+        })
+    );
+}
+
+void
+MySqlConfigBackendDHCPv4::unregisterBackendType() {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_UNREGISTER_BACKEND_TYPE4);
+    dhcp::ConfigBackendDHCPv4Mgr::instance().unregisterBackendFactory("mysql");
+}
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp4.h b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp4.h
new file mode 100644
index 0000000..1c7dc16
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp4.h
@@ -0,0 +1,631 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef MYSQL_CONFIG_BACKEND_DHCP4_H
+#define MYSQL_CONFIG_BACKEND_DHCP4_H
+
+#include <mysql_cb_impl.h>
+#include <database/database_connection.h>
+#include <dhcpsrv/client_class_def.h>
+#include <dhcpsrv/config_backend_dhcp4.h>
+#include <mysql_cb_log.h>
+#include <boost/shared_ptr.hpp>
+
+namespace isc {
+namespace dhcp {
+
+class MySqlConfigBackendDHCPv4Impl;
+
+/// @brief Implementation of the MySql Configuration Backend for
+/// Kea DHCPv4 server.
+///
+/// All POSIX times specified in the methods belonging to this
+/// class must be local times.
+///
+/// The server selection mechanisms used by this backend generally adhere
+/// to the rules described for @c ConfigBackendDHCPv4, but support for
+/// some of the selectors is not implemented. Whenever this is the case,
+/// the methods throw @c isc::NotImplemented exception.
+class MySqlConfigBackendDHCPv4 : public ConfigBackendDHCPv4 {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit MySqlConfigBackendDHCPv4(const db::DatabaseConnection::ParameterMap& parameters);
+
+    /// @brief Retrieves a single subnet by subnet_prefix.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be retrieved.
+    /// @return Pointer to the retrieved subnet or NULL if not found.
+    virtual Subnet4Ptr
+    getSubnet4(const db::ServerSelector& server_selector,
+               const std::string& subnet_prefix) const;
+
+    /// @brief Retrieves a single subnet by subnet identifier.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of a subnet to be retrieved.
+    /// @return Pointer to the retrieved subnet or NULL if not found.
+    virtual Subnet4Ptr
+    getSubnet4(const db::ServerSelector& server_selector, const SubnetID& subnet_id) const;
+
+    /// @brief Retrieves all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet4Collection
+    getAllSubnets4(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves subnets modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound subnet modification time.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet4Collection
+    getModifiedSubnets4(const db::ServerSelector& server_selector,
+                        const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves all subnets belonging to a specified shared network.
+    ///
+    /// The server selector is currently ignored by this method. All subnets
+    /// for the given shared network are returned regardless of their
+    /// associations with the servers.
+    ///
+    /// @param server_selector Server selector (currently ignored).
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be retrieved.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet4Collection
+    getSharedNetworkSubnets4(const db::ServerSelector& server_selector,
+                             const std::string& shared_network_name) const;
+
+    /// @brief Retrieves shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the shared network to be retrieved.
+    /// @return Pointer to the shared network or NULL if not found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual SharedNetwork4Ptr
+    getSharedNetwork4(const db::ServerSelector& server_selector,
+                      const std::string& name) const;
+
+    /// @brief Retrieves all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of shared network or empty collection if
+    /// no shared network found.
+    virtual SharedNetwork4Collection
+    getAllSharedNetworks4(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves shared networks modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound shared network modification time.
+    /// @return Collection of shared network or empty collection if
+    /// no shared network found.
+    virtual SharedNetwork4Collection
+    getModifiedSharedNetworks4(const db::ServerSelector& server_selector,
+                               const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves single option definition by code and space.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be retrieved.
+    /// @param space Option space of the option to be retrieved.
+    /// @return Pointer to the option definition or NULL if not found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual OptionDefinitionPtr
+    getOptionDef4(const db::ServerSelector& server_selector, const uint16_t code,
+                  const std::string& space) const;
+
+    /// @brief Retrieves all option definitions.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of option definitions or empty collection if
+    /// no option definition found.
+    virtual OptionDefContainer
+    getAllOptionDefs4(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves option definitions modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound option definition modification
+    /// time.
+    /// @return Collection of option definitions or empty collection if
+    /// no option definition found.
+    virtual OptionDefContainer
+    getModifiedOptionDefs4(const db::ServerSelector& server_selector,
+                           const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves single option by code and space.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Pointer to the retrieved option descriptor or null if
+    /// no option was found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual OptionDescriptorPtr
+    getOption4(const db::ServerSelector& server_selector, const uint16_t code,
+               const std::string& space) const;
+
+    /// @brief Retrieves all global options.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of global options or empty collection if no
+    /// option found.
+    virtual OptionContainer
+    getAllOptions4(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves option modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound option modification time.
+    /// @return Collection of global options or empty collection if no
+    /// option found.
+    virtual OptionContainer
+    getModifiedOptions4(const db::ServerSelector& server_selector,
+                        const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves global parameter value.
+    ///
+    /// Typically, the server selector used for this query should be set to
+    /// ONE. It is possible to use the MULTIPLE server selector but in that
+    /// case only the first found parameter is returned.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter to be retrieved.
+    /// @return Value of the global parameter.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual data::StampedValuePtr
+    getGlobalParameter4(const db::ServerSelector& server_selector,
+                        const std::string& name) const;
+
+    /// @brief Retrieves all global parameters.
+    ///
+    /// Using the server selector it is possible to fetch the parameters for
+    /// one or more servers. The following list describes what parameters are
+    /// returned depending on the server selector specified:
+    /// - ALL: only common parameters are returned which are associated with
+    ///   the logical server 'all'. No parameters associated with the explicit
+    ///   server tags are returned.
+    ///
+    /// - ONE: parameters used by the particular sever are returned. This includes
+    ///   parameters associated with the particular server (identified by tag)
+    ///   and parameters associated with the logical server 'all' when server
+    ///   specific parameters are not given. For example, if there is a
+    ///   renew-timer specified for 'server1' tag, different value of the
+    ///   renew-timer specified for 'all' servers and a rebind-timer specified
+    ///   for 'all' servers, the caller will receive renew-timer value associated
+    ///   with the server1 and the rebind-timer value associated with all servers,
+    ///   because there is no explicit rebind-timer specified for server1.
+    ///
+    /// - MULTIPLE: parameters used by multiple servers, but those associated
+    ///   with specific server tags take precedence over the values specified for
+    ///   'all' servers. This is similar to the case of ONE server described
+    ///   above. The effect of querying for parameters belonging to multiple
+    ///   servers is the same as issuing multiple queries with ONE server
+    ///   being selected multiple times.
+    ///
+    /// - UNASSIGNED: parameters not associated with any servers.
+    ///
+    ///
+    /// @param server_selector Server selector.
+    virtual data::StampedValueCollection
+    getAllGlobalParameters4(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves global parameters modified after specified time.
+    ///
+    /// @param modification_time Lower bound modification time.
+    /// @return Collection of modified global parameters.
+    virtual data::StampedValueCollection
+    getModifiedGlobalParameters4(const db::ServerSelector& server_selector,
+                                 const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves a client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Client class name.
+    /// @return Pointer to the retrieved client class.
+    virtual ClientClassDefPtr
+    getClientClass4(const db::ServerSelector& selector, const std::string& name) const;
+
+    /// @brief Retrieves all client classes.
+    ///
+    /// @param selector Server selector.
+    /// @return Collection of client classes.
+    virtual ClientClassDictionary
+    getAllClientClasses4(const db::ServerSelector& selector) const;
+
+    /// @brief Retrieves client classes modified after specified time.
+    ///
+    /// @param selector Server selector.
+    /// @param modification_time Modification time.
+    /// @return Collection of client classes.
+    virtual ClientClassDictionary
+    getModifiedClientClasses4(const db::ServerSelector& selector,
+                              const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves the most recent audit entries.
+    ///
+    /// @param selector Server selector.
+    /// @param modification_time Timestamp being a lower limit for the returned
+    /// result set, i.e. entries later than specified time are returned.
+    /// @param modification_id Identifier being a lower limit for the returned
+    /// result set, used when two (or more) entries have the same
+    /// modification_time.
+    /// @return Collection of audit entries.
+    virtual db::AuditEntryCollection
+    getRecentAuditEntries(const db::ServerSelector& server_selector,
+                          const boost::posix_time::ptime& modification_time,
+                          const uint64_t& modification_id) const;
+
+    /// @brief Retrieves all servers.
+    ///
+    /// This method returns the list of servers excluding the logical server
+    /// 'all'.
+    ///
+    /// @return Collection of servers from the backend.
+    virtual db::ServerCollection
+    getAllServers4() const;
+
+    /// @brief Retrieves a server.
+    ///
+    /// @param server_tag Tag of the server to be retrieved.
+    /// @return Pointer to the server instance or null pointer if no server
+    /// with the particular tag was found.
+    virtual db::ServerPtr
+    getServer4(const data::ServerTag& server_tag) const;
+
+    /// @brief Creates or updates a subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Subnet to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateSubnet4(const db::ServerSelector& server_selector,
+                        const Subnet4Ptr& subnet);
+
+    /// @brief Creates or updates a shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network Shared network to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateSharedNetwork4(const db::ServerSelector& server_selector,
+                               const SharedNetwork4Ptr& shared_network);
+
+    /// @brief Creates or updates an option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Option definition to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOptionDef4(const db::ServerSelector& server_selector,
+                           const OptionDefinitionPtr& option_def);
+
+    /// @brief Creates or updates global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption4(const db::ServerSelector& server_selector,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of a shared network to which option
+    /// belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption4(const db::ServerSelector& server_selector,
+                        const std::string& shared_network_name,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of a subnet to which option belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption4(const db::ServerSelector& server_selector,
+                        const SubnetID& subnet_id,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool to which
+    /// the option belongs.
+    /// @param pool_end_address Upper bound address of the pool to which the
+    /// option belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption4(const db::ServerSelector& server_selector,
+                        const asiolink::IOAddress& pool_start_address,
+                        const asiolink::IOAddress& pool_end_address,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter.
+    /// @param value Value of the global parameter.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateGlobalParameter4(const db::ServerSelector& server_selector,
+                                 const data::StampedValuePtr& value);
+
+    /// @brief Creates or updates DHCPv4 client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Client class to be added or updated.
+    /// @param follow_class_name name of the class after which the
+    /// new or updated class should be positioned. An empty value
+    /// causes the class to be appended at the end of the class
+    /// hierarchy.
+    virtual void
+    createUpdateClientClass4(const db::ServerSelector& server_selector,
+                             const ClientClassDefPtr& client_class,
+                             const std::string& follow_class_name);
+
+    /// @brief Creates or updates a server.
+    ///
+    /// @param server Instance of the server to be stored.
+    /// @throw InvalidOperation when trying to create a duplicate or
+    /// update the logical server 'all'.
+    virtual void
+    createUpdateServer4(const db::ServerPtr& server);
+
+    /// @brief Deletes subnet by prefix.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSubnet4(const db::ServerSelector& server_selector,
+                  const std::string& subnet_prefix);
+
+    /// @brief Deletes subnet by identifier.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSubnet4(const db::ServerSelector& server_selector, const SubnetID& subnet_id);
+
+    /// @brief Deletes all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllSubnets4(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes all subnets belonging to a specified shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be deleted.
+    /// @return Number of deleted subnets.
+    virtual uint64_t
+    deleteSharedNetworkSubnets4(const db::ServerSelector& server_selector,
+                                const std::string& shared_network_name);
+
+    /// @brief Deletes shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the shared network to be deleted.
+    /// @return Number of deleted shared networks.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSharedNetwork4(const db::ServerSelector& server_selector,
+                         const std::string& name);
+
+    /// @brief Deletes all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted shared networks.
+    virtual uint64_t
+    deleteAllSharedNetworks4(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be deleted.
+    /// @param space Option space of the option to be deleted.
+    /// @return Number of deleted option definitions.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOptionDef4(const db::ServerSelector& server_selector, const uint16_t code,
+                     const std::string& space);
+
+    /// @brief Deletes all option definitions.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted option definitions.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllOptionDefs4(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be deleted.
+    /// @param space Option space of the option to be deleted.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption4(const db::ServerSelector& server_selector, const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network which deleted
+    /// option belongs to
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption4(const db::ServerSelector& server_selector,
+                  const std::string& shared_network_name,
+                  const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to which deleted option
+    /// belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption4(const db::ServerSelector& server_selector, const SubnetID& subnet_id,
+                  const uint16_t code, const std::string& space);
+
+    /// @brief Deletes pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool to which
+    /// deleted option belongs.
+    /// @param pool_end_address Upper bound address of the pool to which the
+    /// deleted option belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption4(const db::ServerSelector& server_selector,
+                  const asiolink::IOAddress& pool_start_address,
+                  const asiolink::IOAddress& pool_end_address,
+                  const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter to be deleted.
+    /// @return Number of deleted global parameters.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteGlobalParameter4(const db::ServerSelector& server_selector,
+                           const std::string& name);
+
+    /// @brief Deletes all global parameters.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted global parameters.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllGlobalParameters4(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes DHCPv4 client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the class to be deleted.
+    /// @return Number of deleted client classes.
+    virtual uint64_t
+    deleteClientClass4(const db::ServerSelector& server_selector,
+                       const std::string& name);
+
+    /// @brief Deletes all client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted client classes.
+    virtual uint64_t
+    deleteAllClientClasses4(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes a server from the backend.
+    ///
+    /// @param server_tag Tag of the server to be deleted.
+    /// @return Number of deleted servers.
+    /// @throw isc::InvalidOperation when trying to delete the logical
+    /// server 'all'.
+    virtual uint64_t
+    deleteServer4(const data::ServerTag& server_tag);
+
+    /// @brief Deletes all servers from the backend except the logical
+    /// server 'all'.
+    ///
+    /// @return Number of deleted servers.
+    virtual uint64_t
+    deleteAllServers4();
+
+    /// @brief Returns backend type in the textual format.
+    ///
+    /// @return "mysql".
+    virtual std::string getType() const;
+
+    /// @brief Returns backend host.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return host on which the database is located.
+    virtual std::string getHost() const;
+
+    /// @brief Returns backend port number.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return Port number on which database service is available.
+    virtual uint16_t getPort() const;
+
+    /// @brief Registers the MySQL backend factory with backend config manager
+    ///
+    /// This should be called by the hook lib load() function.
+    /// @return True if the factory was registered successfully, false otherwise.
+    static bool registerBackendType();
+
+    /// @brief Unregisters the MySQL backend factory and discards MySQL backends
+    ///
+    /// This should be called by the hook lib unload() function.
+    static void unregisterBackendType();
+
+    /// @brief Flag which indicates if the config backend has an unusable
+    /// connection.
+    ///
+    /// @return true if there is at least one unusable connection, false
+    /// otherwise
+    virtual bool isUnusable();
+
+    /// @brief Return backend parameters
+    ///
+    /// Returns the backend parameters
+    ///
+    /// @return Parameters of the backend.
+    isc::db::DatabaseConnection::ParameterMap getParameters() const;
+
+protected:
+
+    /// @brief Pointer to the implementation of the @c MySqlConfigBackendDHCPv4
+    /// class.
+    boost::shared_ptr<MySqlConfigBackendDHCPv4Impl> impl_;
+
+    /// @brief Pointer to the base implementation of the backend shared by
+    /// DHCPv4 and DHCPv6 servers.
+    boost::shared_ptr<MySqlConfigBackendImpl> base_impl_;
+};
+
+/// @brief Pointer to the @c MySqlConfigBackendDHCPv4 class.
+typedef boost::shared_ptr<MySqlConfigBackendDHCPv4> MySqlConfigBackendDHCPv4Ptr;
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif // MYSQL_CONFIG_BACKEND_DHCP4_H
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp6.cc b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp6.cc
new file mode 100644
index 0000000..dfe19e1
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp6.cc
@@ -0,0 +1,4840 @@
+// Copyright (C) 2018-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <asiolink/addr_utilities.h>
+#include <mysql_cb_dhcp6.h>
+#include <mysql_cb_impl.h>
+#include <mysql_query_macros_dhcp.h>
+#include <cc/data.h>
+#include <config_backend/constants.h>
+#include <database/database_connection.h>
+#include <database/db_exceptions.h>
+#include <dhcp/classify.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/libdhcp++.h>
+#include <dhcp/option_data_types.h>
+#include <dhcp/option_space.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <dhcpsrv/config_backend_dhcp6_mgr.h>
+#include <dhcpsrv/network.h>
+#include <dhcpsrv/pool.h>
+#include <dhcpsrv/lease.h>
+#include <dhcpsrv/timer_mgr.h>
+#include <dhcpsrv/parsers/client_class_def_parser.h>
+#include <util/buffer.h>
+#include <util/boost_time_utils.h>
+#include <util/multi_threading_mgr.h>
+#include <util/triplet.h>
+#include <mysql/mysql_connection.h>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/lexical_cast.hpp>
+#include <boost/pointer_cast.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <mysql.h>
+#include <mysqld_error.h>
+#include <array>
+#include <sstream>
+#include <utility>
+#include <vector>
+
+using namespace isc::cb;
+using namespace isc::db;
+using namespace isc::data;
+using namespace isc::asiolink;
+using namespace isc::log;
+using namespace isc::util;
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Implementation of the MySQL Configuration Backend.
+class MySqlConfigBackendDHCPv6Impl : public MySqlConfigBackendImpl {
+public:
+
+    /// @brief Statement tags.
+    ///
+    /// The contents of the enum are indexes into the list of SQL statements.
+    /// It is assumed that the order is such that the indices of statements
+    /// reading the database are less than those of statements modifying the
+    /// database.
+    enum StatementIndex {
+        CREATE_AUDIT_REVISION,
+        CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+        GET_GLOBAL_PARAMETER6,
+        GET_ALL_GLOBAL_PARAMETERS6,
+        GET_MODIFIED_GLOBAL_PARAMETERS6,
+        GET_SUBNET6_ID_NO_TAG,
+        GET_SUBNET6_ID_ANY,
+        GET_SUBNET6_ID_UNASSIGNED,
+        GET_SUBNET6_PREFIX_NO_TAG,
+        GET_SUBNET6_PREFIX_ANY,
+        GET_SUBNET6_PREFIX_UNASSIGNED,
+        GET_ALL_SUBNETS6,
+        GET_ALL_SUBNETS6_UNASSIGNED,
+        GET_MODIFIED_SUBNETS6,
+        GET_MODIFIED_SUBNETS6_UNASSIGNED,
+        GET_SHARED_NETWORK_SUBNETS6,
+        GET_POOL6_RANGE,
+        GET_POOL6_RANGE_ANY,
+        GET_PD_POOL,
+        GET_PD_POOL_ANY,
+        GET_SHARED_NETWORK6_NAME_NO_TAG,
+        GET_SHARED_NETWORK6_NAME_ANY,
+        GET_SHARED_NETWORK6_NAME_UNASSIGNED,
+        GET_ALL_SHARED_NETWORKS6,
+        GET_ALL_SHARED_NETWORKS6_UNASSIGNED,
+        GET_MODIFIED_SHARED_NETWORKS6,
+        GET_MODIFIED_SHARED_NETWORKS6_UNASSIGNED,
+        GET_OPTION_DEF6_CODE_SPACE,
+        GET_ALL_OPTION_DEFS6,
+        GET_MODIFIED_OPTION_DEFS6,
+        GET_OPTION6_CODE_SPACE,
+        GET_ALL_OPTIONS6,
+        GET_MODIFIED_OPTIONS6,
+        GET_OPTION6_SUBNET_ID_CODE_SPACE,
+        GET_OPTION6_POOL_ID_CODE_SPACE,
+        GET_OPTION6_PD_POOL_ID_CODE_SPACE,
+        GET_OPTION6_SHARED_NETWORK_CODE_SPACE,
+        GET_CLIENT_CLASS6_NAME,
+        GET_ALL_CLIENT_CLASSES6,
+        GET_ALL_CLIENT_CLASSES6_UNASSIGNED,
+        GET_MODIFIED_CLIENT_CLASSES6,
+        GET_MODIFIED_CLIENT_CLASSES6_UNASSIGNED,
+        GET_AUDIT_ENTRIES6_TIME,
+        GET_SERVER6,
+        GET_ALL_SERVERS6,
+        INSERT_GLOBAL_PARAMETER6,
+        INSERT_GLOBAL_PARAMETER6_SERVER,
+        INSERT_SUBNET6,
+        INSERT_SUBNET6_SERVER,
+        INSERT_POOL6,
+        INSERT_PD_POOL,
+        INSERT_SHARED_NETWORK6,
+        INSERT_SHARED_NETWORK6_SERVER,
+        INSERT_OPTION_DEF6,
+        INSERT_OPTION_DEF6_CLIENT_CLASS,
+        INSERT_OPTION_DEF6_SERVER,
+        INSERT_OPTION6,
+        INSERT_OPTION6_SERVER,
+        INSERT_CLIENT_CLASS6,
+        INSERT_CLIENT_CLASS6_SERVER,
+        INSERT_CLIENT_CLASS6_DEPENDENCY,
+        INSERT_SERVER6,
+        UPDATE_GLOBAL_PARAMETER6,
+        UPDATE_SUBNET6,
+        UPDATE_SHARED_NETWORK6,
+        UPDATE_OPTION_DEF6,
+        UPDATE_OPTION_DEF6_CLIENT_CLASS,
+        UPDATE_OPTION6,
+        UPDATE_OPTION6_SUBNET_ID,
+        UPDATE_OPTION6_POOL_ID,
+        UPDATE_OPTION6_PD_POOL_ID,
+        UPDATE_OPTION6_SHARED_NETWORK,
+        UPDATE_OPTION6_CLIENT_CLASS,
+        UPDATE_CLIENT_CLASS6,
+        UPDATE_CLIENT_CLASS6_SAME_POSITION,
+        UPDATE_SERVER6,
+        DELETE_GLOBAL_PARAMETER6,
+        DELETE_ALL_GLOBAL_PARAMETERS6,
+        DELETE_ALL_GLOBAL_PARAMETERS6_UNASSIGNED,
+        DELETE_SUBNET6_ID_WITH_TAG,
+        DELETE_SUBNET6_ID_ANY,
+        DELETE_SUBNET6_PREFIX_WITH_TAG,
+        DELETE_SUBNET6_PREFIX_ANY,
+        DELETE_ALL_SUBNETS6,
+        DELETE_ALL_SUBNETS6_UNASSIGNED,
+        DELETE_ALL_SUBNETS6_SHARED_NETWORK_NAME,
+        DELETE_SUBNET6_SERVER,
+        DELETE_POOLS6,
+        DELETE_PD_POOLS,
+        DELETE_SHARED_NETWORK6_NAME_WITH_TAG,
+        DELETE_SHARED_NETWORK6_NAME_ANY,
+        DELETE_ALL_SHARED_NETWORKS6,
+        DELETE_ALL_SHARED_NETWORKS6_UNASSIGNED,
+        DELETE_SHARED_NETWORK6_SERVER,
+        DELETE_OPTION_DEF6_CODE_NAME,
+        DELETE_ALL_OPTION_DEFS6,
+        DELETE_ALL_OPTION_DEFS6_UNASSIGNED,
+        DELETE_OPTION_DEFS6_CLIENT_CLASS,
+        DELETE_OPTION6,
+        DELETE_ALL_GLOBAL_OPTIONS6_UNASSIGNED,
+        DELETE_OPTION6_SUBNET_ID,
+        DELETE_OPTION6_POOL_RANGE,
+        DELETE_OPTION6_PD_POOL,
+        DELETE_OPTION6_SHARED_NETWORK,
+        DELETE_OPTIONS6_SUBNET_ID_PREFIX,
+        DELETE_OPTIONS6_SHARED_NETWORK,
+        DELETE_OPTIONS6_CLIENT_CLASS,
+        DELETE_CLIENT_CLASS6_DEPENDENCY,
+        DELETE_CLIENT_CLASS6_SERVER,
+        DELETE_ALL_CLIENT_CLASSES6,
+        DELETE_ALL_CLIENT_CLASSES6_UNASSIGNED,
+        DELETE_CLIENT_CLASS6,
+        DELETE_CLIENT_CLASS6_ANY,
+        DELETE_SERVER6,
+        DELETE_ALL_SERVERS6,
+        NUM_STATEMENTS
+    };
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit MySqlConfigBackendDHCPv6Impl(const DatabaseConnection::ParameterMap&
+                                          parameters);
+
+    /// @brief Destructor.
+    ~MySqlConfigBackendDHCPv6Impl();
+
+    /// @brief Sends query to retrieve global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the parameter to be retrieved.
+    ///
+    /// @return Pointer to the retrieved value or null if such parameter
+    /// doesn't exist.
+    StampedValuePtr getGlobalParameter6(const ServerSelector& server_selector,
+                                        const std::string& name) {
+        StampedValueCollection parameters;
+
+        auto const& tags = server_selector.getTags();
+        for (auto const& tag : tags) {
+            MySqlBindingCollection in_bindings = {
+                MySqlBinding::createString(tag.get()),
+                MySqlBinding::createString(name)
+            };
+
+            getGlobalParameters(GET_GLOBAL_PARAMETER6, in_bindings, parameters);
+        }
+
+        return (parameters.empty() ? StampedValuePtr() : *parameters.begin());
+    }
+
+    /// @brief Sends query to insert or update global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter.
+    /// @param value Value of the global parameter.
+    void createUpdateGlobalParameter6(const db::ServerSelector& server_selector,
+                                      const StampedValuePtr& value) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        auto tag = getServerTag(server_selector, "creating or updating global parameter");
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(value->getName()),
+            MySqlBinding::createString(value->getValue()),
+            MySqlBinding::createInteger<uint8_t>(value->getType()),
+            MySqlBinding::createTimestamp(value->getModificationTime()),
+            MySqlBinding::createString(tag),
+            MySqlBinding::createString(value->getName())
+        };
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this, MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "global parameter set", false);
+
+        // Try to update the existing row.
+        if (conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::UPDATE_GLOBAL_PARAMETER6,
+                                    in_bindings) == 0) {
+            // No such parameter found, so let's insert it. We have to adjust the
+            // bindings collection to match the prepared statement for insert.
+            in_bindings.pop_back();
+            in_bindings.pop_back();
+            conn_.insertQuery(MySqlConfigBackendDHCPv6Impl::INSERT_GLOBAL_PARAMETER6,
+                              in_bindings);
+
+            // Successfully inserted global parameter. Now, we have to associate it
+            // with the server tag.
+
+            // Let's first get the primary key of the global parameter.
+            uint64_t id = mysql_insert_id(conn_.mysql_);
+
+            // Successfully inserted global parameter. Now, we have to associate it
+            // with the server tag.
+            attachElementToServers(MySqlConfigBackendDHCPv6Impl::INSERT_GLOBAL_PARAMETER6_SERVER,
+                                   server_selector,
+                                   MySqlBinding::createInteger<uint64_t>(id),
+                                   MySqlBinding::createTimestamp(value->getModificationTime()));
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Sends query to the database to retrieve multiple subnets.
+    ///
+    /// Query should order subnets by subnet_id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] subnets Reference to the container where fetched subnets
+    /// will be inserted.
+    void getSubnets6(const StatementIndex& index,
+                     const ServerSelector& server_selector,
+                     const MySqlBindingCollection& in_bindings,
+                     Subnet6Collection& subnets) {
+        // Create output bindings. The order must match that in the prepared
+        // statement. Please put comments only at the end of line so
+        // line counting and indexing match.
+        // The server tag must be the last field.
+        MySqlBindingCollection out_bindings = {
+            MySqlBinding::createInteger<uint32_t>(), // subnet_id
+            MySqlBinding::createString(SUBNET6_PREFIX_BUF_LENGTH), // subnet_prefix
+            MySqlBinding::createString(CLIENT_CLASS_BUF_LENGTH), // client_class
+            MySqlBinding::createString(INTERFACE_BUF_LENGTH), // interface
+            MySqlBinding::createTimestamp(), // modification_ts
+            MySqlBinding::createInteger<uint32_t>(), // preferred_lifetime
+            MySqlBinding::createInteger<uint8_t>(), // rapid_commit
+            MySqlBinding::createInteger<uint32_t>(), // rebind_timer
+            MySqlBinding::createString(RELAY_BUF_LENGTH), // relay
+            MySqlBinding::createInteger<uint32_t>(), // renew_timer
+            MySqlBinding::createString(REQUIRE_CLIENT_CLASSES_BUF_LENGTH), // require_client_classes
+            MySqlBinding::createInteger<uint8_t>(), // reservations_global
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // shared_network_name
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // user_context
+            MySqlBinding::createInteger<uint32_t>(), // valid_lifetime
+            MySqlBinding::createInteger<uint64_t>(), // pool: id
+            MySqlBinding::createString(POOL_ADDRESS6_BUF_LENGTH), // pool: start_address
+            MySqlBinding::createString(POOL_ADDRESS6_BUF_LENGTH), // pool: end_address
+            MySqlBinding::createInteger<uint32_t>(), // pool: subnet_id
+            MySqlBinding::createTimestamp(), // pool: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // pd pool: id
+            MySqlBinding::createString(POOL_ADDRESS6_BUF_LENGTH), // pd pool: prefix
+            MySqlBinding::createInteger<uint8_t>(), // pd pool: prefix_length
+            MySqlBinding::createInteger<uint8_t>(), // pd pool: delegated_prefix_length
+            MySqlBinding::createInteger<uint32_t>(), // pd pool: subnet_id
+            MySqlBinding::createTimestamp(), // pd pool: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // pool option: option_id
+            MySqlBinding::createInteger<uint16_t>(), // pool option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // pool option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // pool option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // pool option: space
+            MySqlBinding::createInteger<uint8_t>(), // pool option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // pool option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // pool option: dhcp6_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // pool option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pool option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // pool option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // pool option: pool_id
+            MySqlBinding::createTimestamp(), // pool option: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // pool option: pd_pool_id
+            MySqlBinding::createInteger<uint64_t>(), // pd pool option: option_id
+            MySqlBinding::createInteger<uint16_t>(), // pd pool option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // pd pool option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // pd pool option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // pd pool option: space
+            MySqlBinding::createInteger<uint8_t>(), // pd pool option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // pd pool option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // pd pool option: dhcp6_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // pd pool option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pd pool option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // pd pool option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // pd pool option: pool_id
+            MySqlBinding::createTimestamp(), // pd pool option: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // pd pool option: pd_pool_id
+            MySqlBinding::createInteger<uint64_t>(), // option: option_id
+            MySqlBinding::createInteger<uint16_t>(), // option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // option: space
+            MySqlBinding::createInteger<uint8_t>(), // option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // option: dhcp6_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // option: pool_id
+            MySqlBinding::createTimestamp(), // option: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // option: pd_pool_id
+            MySqlBinding::createInteger<uint8_t>(), // calculate_tee_times
+            MySqlBinding::createInteger<float>(), // t1_percent
+            MySqlBinding::createInteger<float>(), // t2_percent
+            MySqlBinding::createBlob(INTERFACE_ID_BUF_LENGTH), // interface_id
+            MySqlBinding::createInteger<uint32_t>(), // min_preferred_lifetime
+            MySqlBinding::createInteger<uint32_t>(), // max_preferred_lifetime
+            MySqlBinding::createInteger<uint32_t>(), // min_valid_lifetime
+            MySqlBinding::createInteger<uint32_t>(), // max_valid_lifetime
+            MySqlBinding::createString(CLIENT_CLASS_BUF_LENGTH), // pool: client_class
+            MySqlBinding::createString(REQUIRE_CLIENT_CLASSES_BUF_LENGTH), // pool: require_client_classes
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pool: user_context
+            MySqlBinding::createString(POOL_ADDRESS6_BUF_LENGTH), // pd pool: excluded_prefix
+            MySqlBinding::createInteger<uint8_t>(), // pd pool: excluded_prefix_length
+            MySqlBinding::createString(CLIENT_CLASS_BUF_LENGTH), // pd pool: client_class
+            MySqlBinding::createString(REQUIRE_CLIENT_CLASSES_BUF_LENGTH), // pd pool: require_client_classes
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pd pool: user_context
+            MySqlBinding::createInteger<uint8_t>(), // ddns_send_updates
+            MySqlBinding::createInteger<uint8_t>(), // ddns_override_no_update
+            MySqlBinding::createInteger<uint8_t>(), // ddns_override_client_update
+            MySqlBinding::createInteger<uint8_t>(), // ddns_replace_client_name
+            MySqlBinding::createString(DNS_NAME_BUF_LENGTH), // ddns_generated_prefix
+            MySqlBinding::createString(DNS_NAME_BUF_LENGTH), // ddns_qualifying_suffix
+            MySqlBinding::createInteger<uint8_t>(), // reservations_in_subnet
+            MySqlBinding::createInteger<uint8_t>(), // reservations_out_of_pool
+            MySqlBinding::createInteger<float>(), // cache_threshold
+            MySqlBinding::createInteger<uint32_t>(), // cache_max_age
+            MySqlBinding::createString(ALLOCATOR_TYPE_BUF_LENGTH), // allocator
+            MySqlBinding::createString(ALLOCATOR_TYPE_BUF_LENGTH), // pd_allocator
+            MySqlBinding::createString(SERVER_TAG_BUF_LENGTH) // server_tag
+        };
+
+        uint64_t last_pool_id = 0;
+        uint64_t last_pd_pool_id = 0;
+        uint64_t last_pool_option_id = 0;
+        uint64_t last_pd_pool_option_id = 0;
+        uint64_t last_option_id = 0;
+        Pool6Ptr last_pool;
+        Pool6Ptr last_pd_pool;
+        std::string last_tag;
+
+        // Execute actual query.
+        conn_.selectQuery(index, in_bindings, out_bindings,
+                          [this, &subnets, &last_pool,  &last_pd_pool,
+                           &last_pool_id, &last_pd_pool_id,
+                           &last_pool_option_id, &last_pd_pool_option_id,
+                           &last_option_id, &last_tag]
+                          (MySqlBindingCollection& out_bindings) {
+            // Get pointer to the last subnet in the collection.
+            Subnet6Ptr last_subnet;
+            if (!subnets.empty()) {
+                last_subnet = *subnets.rbegin();
+            }
+
+            // Subnet has been returned. Assuming that subnets are ordered by
+            // subnet identifier, if the subnet identifier of the current row
+            // is different than the subnet identifier of the previously returned
+            // row, it means that we have to construct new subnet object.
+            if (!last_subnet || (last_subnet->getID() != out_bindings[0]->getInteger<uint32_t>())) {
+                // Reset per subnet component tracking and server tag because
+                // we're now starting to process a new subnet.
+                last_pool_id = 0;
+                last_pd_pool_id = 0;
+                last_pool_option_id = 0;
+                last_pd_pool_option_id = 0;
+                last_option_id = 0;
+                last_pool.reset();
+                last_pd_pool.reset();
+                last_tag.clear();
+
+                // Get subnet parameters required by the constructor first.
+
+                // subnet_id (0)
+                SubnetID subnet_id(out_bindings[0]->getInteger<uint32_t>());
+
+                // subnet_prefix (1)
+                std::string subnet_prefix = out_bindings[1]->getString();
+                auto prefix_pair = Subnet6::parsePrefix(subnet_prefix);
+
+                // preferred_lifetime (5)
+                // min_preferred_lifetime (72)
+                // max_preferred_lifetime (73)
+                auto preferred_lifetime = createTriplet(out_bindings[5],
+                                                        out_bindings[72],
+                                                        out_bindings[73]);
+
+                // renew_timer (9)
+                auto renew_timer = createTriplet(out_bindings[9]);
+
+                // rebind_timer (7)
+                auto rebind_timer = createTriplet(out_bindings[7]);
+
+                // valid_lifetime (14)
+                // min_valid_lifetime (74)
+                // max_valid_lifetime (75)
+                auto valid_lifetime = createTriplet(out_bindings[14],
+                                                    out_bindings[74],
+                                                    out_bindings[75]);
+
+                // Create subnet with basic settings.
+                last_subnet = Subnet6::create(prefix_pair.first, prefix_pair.second,
+                                              renew_timer, rebind_timer,
+                                              preferred_lifetime,
+                                              valid_lifetime, subnet_id);
+
+                // 0 and 1 are subnet_id and subnet_prefix
+
+                // client_class (2)
+                if (!out_bindings[2]->amNull()) {
+                    last_subnet->allowClientClass(out_bindings[2]->getString());
+                }
+
+                // interface (3)
+                if (!out_bindings[3]->amNull()) {
+                    last_subnet->setIface(out_bindings[3]->getString());
+                }
+
+                // modification_ts (4)
+                last_subnet->setModificationTime(out_bindings[4]->getTimestamp());
+                // 5 is preferred_lifetime
+
+                // rapid_commit (6)
+                if (!out_bindings[6]->amNull()) {
+                    last_subnet->setRapidCommit(out_bindings[6]->getBool());
+                }
+
+                // 7 is rebind_timer
+
+                // relay (8)
+                ElementPtr relay_element = out_bindings[8]->getJSON();
+                if (relay_element) {
+                    if (relay_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid relay value "
+                                  << out_bindings[8]->getString());
+                    }
+                    for (auto i = 0; i < relay_element->size(); ++i) {
+                        auto relay_address_element = relay_element->get(i);
+                        if (relay_address_element->getType() != Element::string) {
+                            isc_throw(BadValue, "relay address must be a string");
+                        }
+                        last_subnet->addRelayAddress(IOAddress(relay_element->get(i)->stringValue()));
+                    }
+                }
+
+                // 9 is renew_timer
+
+                // require_client_classes (10)
+                ElementPtr require_element = out_bindings[10]->getJSON();
+                if (require_element) {
+                    if (require_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid require_client_classes value "
+                                  << out_bindings[10]->getString());
+                    }
+                    for (auto i = 0; i < require_element->size(); ++i) {
+                        auto require_item = require_element->get(i);
+                        if (require_item->getType() != Element::string) {
+                            isc_throw(BadValue, "elements of require_client_classes list must"
+                                      "be valid strings");
+                        }
+                        last_subnet->requireClientClass(require_item->stringValue());
+                    }
+                }
+
+                // reservations_global (11)
+                if (!out_bindings[11]->amNull()) {
+                    last_subnet->setReservationsGlobal(out_bindings[11]->getBool());
+                }
+
+                // shared_network_name (12)
+                if (!out_bindings[12]->amNull()) {
+                    last_subnet->setSharedNetworkName(out_bindings[12]->getString());
+                }
+
+                // user_context (13)
+                ElementPtr user_context = out_bindings[13]->getJSON();
+                if (user_context) {
+                    last_subnet->setContext(user_context);
+                }
+
+                // 14 is valid_lifetime
+
+                // 15 to 19 are pool
+                // 20 to 25 are pd pool
+                // 26 to 39 are pool option
+                // 40 to 53 are pd pool option
+                // 54 to 67 are option
+
+                // calculate_tee_times (68)
+                if (!out_bindings[68]->amNull()) {
+                    last_subnet->setCalculateTeeTimes(out_bindings[68]->getBool());
+                }
+
+                // t1_percent (69)
+                if (!out_bindings[69]->amNull()) {
+                    last_subnet->setT1Percent(out_bindings[69]->getFloat());
+                }
+
+                // t2_percent (70)
+                if (!out_bindings[70]->amNull()) {
+                    last_subnet->setT2Percent(out_bindings[70]->getFloat());
+                }
+
+                // interface_id (71)
+                if (!out_bindings[71]->amNull()) {
+                    auto iface_id_data = out_bindings[71]->getBlob();
+                    if (!iface_id_data.empty()) {
+                        OptionPtr opt_iface_id(new Option(Option::V6, D6O_INTERFACE_ID,
+                                                          iface_id_data));
+                        last_subnet->setInterfaceId(opt_iface_id);
+                    }
+                }
+
+                // 72 and 73 are {min,max}_preferred_lifetime
+
+                // 74 and 75 are {min,max}_valid_lifetime
+
+                // 76 is pool client_class
+                // 77 is pool require_client_classes
+                // 78 is pool user_context
+                // 79 is pd pool excluded_prefix
+                // 80 is pd pool excluded_prefix_length
+                // 81 is pd pool client_class
+                // 82 is pd pool require_client_classes
+                // 83 is pd pool user_context
+
+                // ddns_send_updates (84)
+                if (!out_bindings[84]->amNull()) {
+                    last_subnet->setDdnsSendUpdates(out_bindings[84]->getBool());
+                }
+
+                // ddns_override_no_update (85)
+                if (!out_bindings[85]->amNull()) {
+                    last_subnet->setDdnsOverrideNoUpdate(out_bindings[85]->getBool());
+                }
+
+                // ddns_override_client_update (86)
+                if (!out_bindings[86]->amNull()) {
+                    last_subnet->setDdnsOverrideClientUpdate(out_bindings[86]->getBool());
+                }
+
+                // ddns_replace_client_name (87)
+                if (!out_bindings[87]->amNull()) {
+                    last_subnet->setDdnsReplaceClientNameMode(static_cast<D2ClientConfig::ReplaceClientNameMode>
+                        (out_bindings[87]->getInteger<uint8_t>()));
+                }
+
+                // ddns_generated_prefix (88)
+                if (!out_bindings[88]->amNull()) {
+                    last_subnet->setDdnsGeneratedPrefix(out_bindings[88]->getString());
+                }
+
+                // ddns_qualifying_suffix (89)
+                if (!out_bindings[89]->amNull()) {
+                    last_subnet->setDdnsQualifyingSuffix(out_bindings[89]->getString());
+                }
+
+                // reservations_in_subnet (90)
+                if (!out_bindings[90]->amNull()) {
+                    last_subnet->setReservationsInSubnet(out_bindings[90]->getBool());
+                }
+
+                // reservations_out_of_pool (91)
+                if (!out_bindings[91]->amNull()) {
+                    last_subnet->setReservationsOutOfPool(out_bindings[91]->getBool());
+                }
+
+                // cache_threshold (92)
+                if (!out_bindings[92]->amNull()) {
+                    last_subnet->setCacheThreshold(out_bindings[92]->getFloat());
+                }
+
+                // cache_max_age (93)
+                if (!out_bindings[93]->amNull()) {
+                    last_subnet->setCacheMaxAge(out_bindings[93]->getInteger<uint32_t>());
+                }
+
+                // allocator (94)
+                if (!out_bindings[94]->amNull()) {
+                    last_subnet->setAllocatorType(out_bindings[94]->getString());
+                }
+
+                // pd_allocator (95)
+                if (!out_bindings[95]->amNull()) {
+                    last_subnet->setPdAllocatorType(out_bindings[95]->getString());
+                }
+
+                // server_tag (96 / last)
+
+                // Subnet ready. Add it to the list.
+                auto ret = subnets.insert(last_subnet);
+
+                // subnets is a multi index container with unique indexes
+                // but these indexes are unique too in the database,
+                // so this is for sanity only.
+                if (!ret.second) {
+                    isc_throw(Unexpected, "add subnet failed");
+                }
+            }
+
+            // Check for new server tags.
+            if (!out_bindings[96]->amNull() &&
+                (last_tag != out_bindings[96]->getString())) {
+                last_tag = out_bindings[96]->getString();
+                if (!last_tag.empty() && !last_subnet->hasServerTag(ServerTag(last_tag))) {
+                    last_subnet->setServerTag(last_tag);
+                }
+            }
+
+            // Pool is between 15 and 19 with extra between 76 and 78
+
+            // If the row contains information about the pool and it
+            // appears to be new pool entry (checked by comparing pool
+            // id), let's create the new pool and add it to the
+            // subnet.
+            // pool id (15)
+            // pool start_address (16)
+            // pool end_address (17)
+            if (!out_bindings[15]->amNull() &&
+                !out_bindings[16]->getString().empty() &&
+                !out_bindings[17]->getString().empty() &&
+                (out_bindings[15]->getInteger<uint64_t>() > last_pool_id)) {
+                last_pool_id = out_bindings[15]->getInteger<uint64_t>();
+                last_pool = Pool6::create(Lease::TYPE_NA,
+                                          IOAddress(out_bindings[16]->getString()),
+                                          IOAddress(out_bindings[17]->getString()));
+
+                // 18 is pool subnet_id (ignored)
+                // 19 is pool modification_ts (ignored)
+
+                // pool client_class (76)
+                if (!out_bindings[76]->amNull()) {
+                    last_pool->allowClientClass(out_bindings[76]->getString());
+                }
+
+                // pool require_client_classes (77)
+                ElementPtr require_element = out_bindings[77]->getJSON();
+                if (require_element) {
+                    if (require_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid pool require_client_classes value "
+                                  << out_bindings[77]->getString());
+                    }
+                    for (auto i = 0; i < require_element->size(); ++i) {
+                        auto require_item = require_element->get(i);
+                        if (require_item->getType() != Element::string) {
+                            isc_throw(BadValue, "elements of pool require_client_classes list must"
+                                      "be valid strings");
+                        }
+                        last_pool->requireClientClass(require_item->stringValue());
+                    }
+                }
+
+                // pool user_context (78)
+                ElementPtr user_context = out_bindings[78]->getJSON();
+                if (user_context) {
+                    last_pool->setContext(user_context);
+                }
+
+                last_subnet->addPool(last_pool);
+            }
+
+            // Pd Pool is between 20 and 25 with extra between 79 and 83
+
+            // If the row contains information about the pd pool and
+            // it appears to be new pd pool entry (checked by
+            // comparing pd pool id), let's create the new pd pool and
+            // add it to the subnet.
+            // pd pool id (20)
+            // pd pool prefix (21)
+            // pd pool prefix_length (22)
+            // pd pool delegated_prefix_length (23)
+            if (!out_bindings[20]->amNull() &&
+                !out_bindings[21]->getString().empty() &&
+                (out_bindings[22]->getInteger<uint8_t>() != 0) &&
+                (out_bindings[23]->getInteger<uint8_t>() != 0) &&
+                (out_bindings[20]->getInteger<uint64_t>() > last_pd_pool_id)) {
+                last_pd_pool_id = out_bindings[20]->getInteger<uint64_t>();
+
+                // 24 is pd pool subnet_id (ignored)
+                // 25 is pd pool modification_ts (ignored)
+
+                // excluded_prefix (79) and excluded_prefix_length (80)
+                IOAddress excluded_prefix = IOAddress::IPV6_ZERO_ADDRESS();
+                if (!out_bindings[79]->amNull()) {
+                    excluded_prefix = IOAddress(out_bindings[79]->getString());
+                }
+                last_pd_pool = Pool6::create(IOAddress(out_bindings[21]->getString()),
+                                             out_bindings[22]->getInteger<uint8_t>(),
+                                             out_bindings[23]->getInteger<uint8_t>(),
+                                             excluded_prefix,
+                                             out_bindings[80]->getInteger<uint8_t>());
+
+                // pd pool client_class (81)
+                if (!out_bindings[81]->amNull()) {
+                    last_pd_pool->allowClientClass(out_bindings[81]->getString());
+                }
+
+                // pd pool require_client_classes (82)
+                ElementPtr require_element = out_bindings[82]->getJSON();
+                if (require_element) {
+                    if (require_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid pd pool require_client_classes value "
+                                  << out_bindings[82]->getString());
+                    }
+                    for (auto i = 0; i < require_element->size(); ++i) {
+                        auto require_item = require_element->get(i);
+                        if (require_item->getType() != Element::string) {
+                            isc_throw(BadValue, "elements of pd pool require_client_classes list must"
+                                      "be valid strings");
+                        }
+                        last_pd_pool->requireClientClass(require_item->stringValue());
+                    }
+                }
+
+                // pd pool user_context (83)
+                ElementPtr user_context = out_bindings[83]->getJSON();
+                if (user_context) {
+                    last_pd_pool->setContext(user_context);
+                }
+
+                last_subnet->addPool(last_pd_pool);
+            }
+
+            // Parse pool specific option between 26 and 39
+            if (last_pool && !out_bindings[26]->amNull() &&
+                (last_pool_option_id < out_bindings[26]->getInteger<uint64_t>())) {
+                last_pool_option_id = out_bindings[26]->getInteger<uint64_t>();
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, out_bindings.begin() + 26);
+                if (desc) {
+                    last_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+
+            // Parse pd pool specific option between 40 and 53
+            if (last_pd_pool && !out_bindings[40]->amNull() &&
+                (last_pd_pool_option_id < out_bindings[40]->getInteger<uint64_t>())) {
+                last_pd_pool_option_id = out_bindings[40]->getInteger<uint64_t>();
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, out_bindings.begin() + 40);
+                if (desc) {
+                    last_pd_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+
+            // Parse subnet specific option between 54 and 67
+            if (!out_bindings[54]->amNull() &&
+                (last_option_id < out_bindings[54]->getInteger<uint64_t>())) {
+                last_option_id = out_bindings[54]->getInteger<uint64_t>();
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, out_bindings.begin() + 54);
+                if (desc) {
+                    last_subnet->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        // Now that we're done fetching the whole subnet, we have to
+        // check if it has matching server tags and toss it if it
+        // doesn't. We skip matching the server tags if we're asking
+        // for ANY subnet.
+        auto& subnet_index = subnets.get<SubnetSubnetIdIndexTag>();
+        tossNonMatchingElements(server_selector, subnet_index);
+    }
+
+    /// @brief Sends query to retrieve single subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Subnet identifier.
+    ///
+    /// @return Pointer to the returned subnet or NULL if such subnet
+    /// doesn't exist.
+    Subnet6Ptr getSubnet6(const ServerSelector& server_selector,
+                          const SubnetID& subnet_id) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a subnet. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        MySqlBindingCollection in_bindings = { MySqlBinding::createInteger<uint32_t>(subnet_id) };
+
+        auto index = GET_SUBNET6_ID_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = GET_SUBNET6_ID_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = GET_SUBNET6_ID_ANY;
+        }
+
+        Subnet6Collection subnets;
+        getSubnets6(index, server_selector, in_bindings, subnets);
+
+        return (subnets.empty() ? Subnet6Ptr() : *subnets.begin());
+    }
+
+    /// @brief Sends query to retrieve single subnet by prefix.
+    ///
+    /// The prefix should be in the following format: "2001:db8:1::/64".
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Subnet identifier.
+    ///
+    /// @return Pointer to the returned subnet or NULL if such subnet
+    /// doesn't exist.
+    Subnet6Ptr getSubnet6(const ServerSelector& server_selector,
+                          const std::string& subnet_prefix) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a subnet. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        MySqlBindingCollection in_bindings = { MySqlBinding::createString(subnet_prefix) };
+
+        auto index = GET_SUBNET6_PREFIX_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = GET_SUBNET6_PREFIX_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = GET_SUBNET6_PREFIX_ANY;
+        }
+
+        Subnet6Collection subnets;
+        getSubnets6(index, server_selector, in_bindings, subnets);
+
+        return (subnets.empty() ? Subnet6Ptr() : *subnets.begin());
+    }
+
+    /// @brief Sends query to retrieve all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getAllSubnets6(const ServerSelector& server_selector,
+                        Subnet6Collection& subnets) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching all subnets for ANY "
+                      "server is not supported");
+        }
+
+        auto index = (server_selector.amUnassigned() ? GET_ALL_SUBNETS6_UNASSIGNED :
+                      GET_ALL_SUBNETS6);
+        MySqlBindingCollection in_bindings;
+        getSubnets6(index, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve modified subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getModifiedSubnets6(const ServerSelector& server_selector,
+                             const boost::posix_time::ptime& modification_ts,
+                             Subnet6Collection& subnets) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified subnets for ANY "
+                      "server is not supported");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createTimestamp(modification_ts)
+        };
+
+        auto index = (server_selector.amUnassigned() ? GET_MODIFIED_SUBNETS6_UNASSIGNED :
+                      GET_MODIFIED_SUBNETS6);
+        getSubnets6(index, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve all subnets belonging to a shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be retrieved.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getSharedNetworkSubnets6(const ServerSelector& server_selector,
+                                  const std::string& shared_network_name,
+                                  Subnet6Collection& subnets) {
+        MySqlBindingCollection in_bindings = { MySqlBinding::createString(shared_network_name) };
+        getSubnets6(GET_SHARED_NETWORK_SUBNETS6, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve multiple pools.
+    ///
+    /// Query should order pools by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] pools Reference to the container where fetched pools
+    /// will be inserted.
+    /// @param [out] pool_ids Identifiers of the pools returned in @c pools
+    /// argument.
+    void getPools(const StatementIndex& index,
+                  const MySqlBindingCollection& in_bindings,
+                  PoolCollection& pools,
+                  std::vector<uint64_t>& pool_ids) {
+        MySqlBindingCollection out_bindings = {
+            MySqlBinding::createInteger<uint64_t>(), // pool: id
+            MySqlBinding::createString(POOL_ADDRESS6_BUF_LENGTH), // pool: start_address
+            MySqlBinding::createString(POOL_ADDRESS6_BUF_LENGTH), // pool: end_address
+            MySqlBinding::createInteger<uint32_t>(), // pool: subnet_id
+            MySqlBinding::createString(CLIENT_CLASS_BUF_LENGTH), // pool: client_class
+            MySqlBinding::createString(REQUIRE_CLIENT_CLASSES_BUF_LENGTH), // pool: require_client_classes
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pool: user_context
+            MySqlBinding::createTimestamp(), // pool: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // pool option: option_id
+            MySqlBinding::createInteger<uint16_t>(), // pool option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // pool option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // pool option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // pool option: space
+            MySqlBinding::createInteger<uint8_t>(), // pool option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // pool option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // pool option: dhcp6_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // pool option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pool option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // pool option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // pool option: pool_id
+            MySqlBinding::createTimestamp(), //pool option: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // pool option: pd_pool_id
+        };
+
+        uint64_t last_pool_id = 0;
+        uint64_t last_pool_option_id = 0;
+        Pool6Ptr last_pool;
+
+        conn_.selectQuery(index, in_bindings, out_bindings,
+                          [this, &last_pool_id, &last_pool_option_id, &last_pool,
+                           &pools, &pool_ids]
+                          (MySqlBindingCollection& out_bindings) {
+            if (out_bindings[0]->getInteger<uint64_t>() > last_pool_id) {
+                // pool id (0)
+                last_pool_id = out_bindings[0]->getInteger<uint64_t>();
+
+                // pool start_address (1)
+                // pool end_address (2)
+                last_pool = Pool6::create(Lease::TYPE_NA,
+                                          IOAddress(out_bindings[1]->getString()),
+                                          IOAddress(out_bindings[2]->getString()));
+
+                // pool subnet_id (3) (ignored)
+
+                // pool client_class (4)
+                if (!out_bindings[4]->amNull()) {
+                    last_pool->allowClientClass(out_bindings[4]->getString());
+                }
+
+                // pool require_client_classes (5)
+                ElementPtr require_element = out_bindings[5]->getJSON();
+                if (require_element) {
+                    if (require_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid pool require_client_classes value "
+                                  << out_bindings[5]->getString());
+                    }
+                    for (auto i = 0; i < require_element->size(); ++i) {
+                        auto require_item = require_element->get(i);
+                        if (require_item->getType() != Element::string) {
+                            isc_throw(BadValue, "elements of pool require_client_classes list must"
+                                      "be valid strings");
+                        }
+                        last_pool->requireClientClass(require_item->stringValue());
+                    }
+                }
+
+                // pool user_context (6)
+                ElementPtr user_context = out_bindings[6]->getJSON();
+                if (user_context) {
+                    last_pool->setContext(user_context);
+                }
+
+                // pool: modification_ts (7) (ignored)
+
+                pools.push_back(last_pool);
+                pool_ids.push_back(last_pool_id);
+            }
+
+            // Parse pool specific option (8).
+            if (last_pool && !out_bindings[8]->amNull() &&
+                (last_pool_option_id < out_bindings[8]->getInteger<uint64_t>())) {
+                last_pool_option_id = out_bindings[8]->getInteger<uint64_t>();
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, out_bindings.begin() + 8);
+                if (desc) {
+                    last_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+    }
+
+    /// @brief Sends query to retrieve multiple pd pools.
+    ///
+    /// Query should order pd pools by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] pd_pools Reference to the container where fetched pools
+    /// will be inserted.
+    /// @param [out] pd_pool_ids Identifiers of the pd pools returned in
+    /// @c pd_pools argument.
+    void getPdPools(const StatementIndex& index,
+                    const MySqlBindingCollection& in_bindings,
+                    PoolCollection& pd_pools,
+                    std::vector<uint64_t>& pd_pool_ids) {
+        MySqlBindingCollection out_bindings = {
+            MySqlBinding::createInteger<uint64_t>(), // pd pool: id
+            MySqlBinding::createString(POOL_ADDRESS6_BUF_LENGTH), // pd pool: prefix
+            MySqlBinding::createInteger<uint8_t>(), // pd pool: prefix_length
+            MySqlBinding::createInteger<uint8_t>(), // pd pool: delegated_prefix_length
+            MySqlBinding::createInteger<uint32_t>(), // pd pool: subnet_id
+            MySqlBinding::createString(POOL_ADDRESS6_BUF_LENGTH), // pd pool: excluded_prefix
+            MySqlBinding::createInteger<uint8_t>(), // pd pool: excluded_prefix_length
+            MySqlBinding::createString(CLIENT_CLASS_BUF_LENGTH), // pd pool: client_class
+            MySqlBinding::createString(REQUIRE_CLIENT_CLASSES_BUF_LENGTH), // pd pool: require_client_classes
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pd pool: user_context
+            MySqlBinding::createTimestamp(), // pd pool: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // pd pool option: option_id
+            MySqlBinding::createInteger<uint16_t>(), // pd pool option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // pd pool option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // pd pool option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // pd pool option: space
+            MySqlBinding::createInteger<uint8_t>(), // pd pool option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // pd pool option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // pd pool option: dhcp6_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // pd pool option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // pd pool option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // pd pool option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // pd pool option: pool_id
+            MySqlBinding::createTimestamp(), // pd pool option: modification_ts
+            MySqlBinding::createInteger<uint64_t>() // pd pool option: pd_pool_id
+        };
+
+        uint64_t last_pd_pool_id = 0;
+        uint64_t last_pd_pool_option_id = 0;
+        Pool6Ptr last_pd_pool;
+
+        conn_.selectQuery(index, in_bindings, out_bindings,
+                          [this, &last_pd_pool_id, &last_pd_pool_option_id,
+                           &last_pd_pool, &pd_pools, &pd_pool_ids]
+                          (MySqlBindingCollection& out_bindings) {
+            if (out_bindings[0]->getInteger<uint64_t>() > last_pd_pool_id) {
+                // pd pool id (0)
+                last_pd_pool_id = out_bindings[0]->getInteger<uint64_t>();
+
+                // pd pool prefix (1)
+                // pd pool prefix_length (2)
+                // pd pool delegated_prefix_length (3)
+
+                // pd pool subnet_id (4 / ignored)
+
+                // excluded_prefix (5) and excluded_prefix_length (6)
+                IOAddress excluded_prefix = IOAddress::IPV6_ZERO_ADDRESS();
+                if (!out_bindings[5]->amNull()) {
+                    excluded_prefix = IOAddress(out_bindings[5]->getString());
+                }
+
+                last_pd_pool = Pool6::create(IOAddress(out_bindings[1]->getString()),
+                                             out_bindings[2]->getInteger<uint8_t>(),
+                                             out_bindings[3]->getInteger<uint8_t>(),
+                                             excluded_prefix,
+                                             out_bindings[6]->getInteger<uint8_t>());
+
+                // pd pool client_class (7)
+                if (!out_bindings[7]->amNull()) {
+                    last_pd_pool->allowClientClass(out_bindings[7]->getString());
+                }
+
+                // pd pool require_client_classes (8)
+                ElementPtr require_element = out_bindings[8]->getJSON();
+                if (require_element) {
+                    if (require_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid pd pool require_client_classes value "
+                                  << out_bindings[8]->getString());
+                    }
+                    for (auto i = 0; i < require_element->size(); ++i) {
+                        auto require_item = require_element->get(i);
+                        if (require_item->getType() != Element::string) {
+                            isc_throw(BadValue, "elements of pd pool require_client_classes list must"
+                                      "be valid strings");
+                        }
+                        last_pd_pool->requireClientClass(require_item->stringValue());
+                    }
+                }
+
+                // pd pool user_context (9)
+                ElementPtr user_context = out_bindings[9]->getJSON();
+                if (user_context) {
+                    last_pd_pool->setContext(user_context);
+                }
+
+                // pd pool modification_ts (10)
+
+                pd_pools.push_back(last_pd_pool);
+                pd_pool_ids.push_back(last_pd_pool_id);
+            }
+
+            // Parse pd pool specific option between 11 and 25
+            if (last_pd_pool && !out_bindings[11]->amNull() &&
+                (last_pd_pool_option_id < out_bindings[11]->getInteger<uint64_t>())) {
+                last_pd_pool_option_id = out_bindings[11]->getInteger<uint64_t>();
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, out_bindings.begin() + 11);
+                if (desc) {
+                    last_pd_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+    }
+
+    /// @brief Sends query to retrieve single pool by address range.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound pool address.
+    /// @param pool_end_address Upper bound pool address.
+    /// @param pool_id Pool identifier for the returned pool.
+    /// @return Pointer to the pool or null if no such pool found.
+    Pool6Ptr getPool6(const ServerSelector& server_selector,
+                      const IOAddress& pool_start_address,
+                      const IOAddress& pool_end_address,
+                      uint64_t& pool_id) {
+        PoolCollection pools;
+        std::vector<uint64_t> pool_ids;
+
+        if (server_selector.amAny()) {
+            MySqlBindingCollection in_bindings = {
+                    MySqlBinding::createString(pool_start_address.toText()),
+                    MySqlBinding::createString(pool_end_address.toText())
+            };
+            getPools(GET_POOL6_RANGE_ANY, in_bindings, pools, pool_ids);
+        } else {
+            auto const& tags = server_selector.getTags();
+            for (auto const& tag : tags) {
+                MySqlBindingCollection in_bindings = {
+                    MySqlBinding::createString(tag.get()),
+                    MySqlBinding::createString(pool_start_address.toText()),
+                    MySqlBinding::createString(pool_end_address.toText())
+                };
+                getPools(GET_POOL6_RANGE, in_bindings, pools, pool_ids);
+                // Break if something is found?
+            }
+        }
+
+        // Return upon the first pool found.
+        if (!pools.empty()) {
+            pool_id = pool_ids[0];
+            return (boost::dynamic_pointer_cast<Pool6>(*pools.begin()));
+        }
+
+        pool_id = 0;
+
+        return (Pool6Ptr());
+    }
+
+    /// @brief Sends query to retrieve single pd pool.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pd_pool_prefix Address part of the pd pool prefix.
+    /// @param pd_pool_prefix_length Length of the pd pool prefix.
+    /// @param pd_pool_id Pool identifier for the returned pool.
+    /// @return Pointer to the pool or null if no such pool found.
+    Pool6Ptr getPdPool6(const ServerSelector& server_selector,
+                        const asiolink::IOAddress& pd_pool_prefix,
+                        const uint8_t pd_pool_prefix_length,
+                        uint64_t& pd_pool_id) {
+        PoolCollection pd_pools;
+        std::vector<uint64_t> pd_pool_ids;
+
+        if (server_selector.amAny()) {
+            MySqlBindingCollection in_bindings = {
+                MySqlBinding::createString(pd_pool_prefix.toText()),
+                MySqlBinding::createInteger<uint8_t>(pd_pool_prefix_length)
+            };
+            getPdPools(GET_PD_POOL_ANY, in_bindings, pd_pools, pd_pool_ids);
+        } else {
+            auto const& tags = server_selector.getTags();
+            for (auto const& tag : tags) {
+                MySqlBindingCollection in_bindings = {
+                    MySqlBinding::createString(tag.get()),
+                    MySqlBinding::createString(pd_pool_prefix.toText()),
+                    MySqlBinding::createInteger<uint8_t>(pd_pool_prefix_length)
+                };
+                getPdPools(GET_PD_POOL, in_bindings, pd_pools, pd_pool_ids);
+            }
+        }
+
+        if (!pd_pools.empty()) {
+            pd_pool_id = pd_pool_ids[0];
+            return (boost::dynamic_pointer_cast<Pool6>(*pd_pools.begin()));
+        }
+
+        pd_pool_id = 0;
+
+        return (Pool6Ptr());
+    }
+
+    /// @brief Sends query to insert or update subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet to be inserted or updated.
+    void createUpdateSubnet6(const ServerSelector& server_selector,
+                             const Subnet6Ptr& subnet) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "creating or updating a subnet for ANY"
+                      " server is not supported");
+
+        } else if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        // Create JSON list of required classes.
+        ElementPtr required_classes_element = Element::createList();
+        const auto& required_classes = subnet->getRequiredClasses();
+        for (auto required_class = required_classes.cbegin();
+             required_class != required_classes.cend();
+             ++required_class) {
+            required_classes_element->add(Element::create(*required_class));
+        }
+
+        // Create binding for DDNS replace client name mode.
+        MySqlBindingPtr ddns_rcn_mode_binding;
+        auto ddns_rcn_mode = subnet->getDdnsReplaceClientNameMode(Network::Inheritance::NONE);
+        if (!ddns_rcn_mode.unspecified()) {
+            ddns_rcn_mode_binding = MySqlBinding::createInteger<uint8_t>(static_cast<uint8_t>
+                                                                         (ddns_rcn_mode.get()));
+        } else {
+            ddns_rcn_mode_binding = MySqlBinding::createNull();
+        }
+
+        // Create binding with shared network name if the subnet belongs to a
+        // shared network.
+        MySqlBindingPtr shared_network_binding;
+
+        SharedNetwork6Ptr shared_network;
+        subnet->getSharedNetwork(shared_network);
+
+        // Check if the subnet is associated with a shared network instance.
+        // If it is, create the binding using the name of the shared network.
+        if (shared_network) {
+            shared_network_binding = MySqlBinding::createString(shared_network->getName());
+
+        // If the subnet is associated with a shared network by name (no
+        // shared network instance), use this name to create the binding.
+        // This may be the case if the subnet is added as a result of
+        // receiving a control command that merely specifies shared
+        // network name. In that case, it is expected that the shared
+        // network data is already stored in the database.
+        } else if (!subnet->getSharedNetworkName().empty()) {
+            shared_network_binding = MySqlBinding::createString(subnet->getSharedNetworkName());
+
+        // If the subnet is not associated with a shared network, create
+        // null binding.
+        } else {
+             shared_network_binding = MySqlBinding::createNull();
+        }
+
+        // Create the binding holding interface_id.
+        MySqlBindingPtr interface_id_binding = MySqlBinding::createNull();
+        auto opt_iface_id = subnet->getInterfaceId(Network::Inheritance::NONE);
+        if (opt_iface_id) {
+            auto iface_id_data = opt_iface_id->getData();
+            if (!iface_id_data.empty()) {
+                interface_id_binding = MySqlBinding::createBlob(iface_id_data.begin(),
+                                                                iface_id_data.end());
+            }
+        }
+
+        // Create input bindings.
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint32_t>(subnet->getID()),
+            MySqlBinding::createString(subnet->toText()),
+            MySqlBinding::condCreateString(subnet->getClientClass(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(subnet->getIface(Network::Inheritance::NONE)),
+            MySqlBinding::createTimestamp(subnet->getModificationTime()),
+            createBinding(subnet->getPreferred(Network::Inheritance::NONE)),
+            createMinBinding(subnet->getPreferred(Network::Inheritance::NONE)),
+            createMaxBinding(subnet->getPreferred(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getRapidCommit(Network::Inheritance::NONE)),
+            createBinding(subnet->getT2(Network::Inheritance::NONE)),
+            createInputRelayBinding(subnet),
+            createBinding(subnet->getT1(Network::Inheritance::NONE)),
+            createInputRequiredClassesBinding(subnet),
+            MySqlBinding::condCreateBool(subnet->getReservationsGlobal(Network::Inheritance::NONE)),
+            shared_network_binding,
+            createInputContextBinding(subnet),
+            createBinding(subnet->getValid(Network::Inheritance::NONE)),
+            createMinBinding(subnet->getValid(Network::Inheritance::NONE)),
+            createMaxBinding(subnet->getValid(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getCalculateTeeTimes(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(subnet->getT1Percent(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(subnet->getT2Percent(Network::Inheritance::NONE)),
+            interface_id_binding,
+            MySqlBinding::condCreateBool(subnet->getDdnsSendUpdates(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getDdnsOverrideNoUpdate(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getDdnsOverrideClientUpdate(Network::Inheritance::NONE)),
+            ddns_rcn_mode_binding,
+            MySqlBinding::condCreateString(subnet->getDdnsGeneratedPrefix(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(subnet->getDdnsQualifyingSuffix(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getReservationsInSubnet(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(subnet->getReservationsOutOfPool(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(subnet->getCacheThreshold(Network::Inheritance::NONE)),
+            condCreateInteger<uint32_t>(subnet->getCacheMaxAge(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(subnet->getAllocatorType(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(subnet->getPdAllocatorType(Network::Inheritance::NONE))
+        };
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision audit_revision(this,
+                                           MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                                           server_selector, "subnet set", true);
+
+        try {
+
+            // Try to insert subnet. If this duplicates unique key, i.e. this
+            // subnet already exists it will throw DuplicateEntry exception in
+            // which case we'll try an update.
+            conn_.insertQuery(MySqlConfigBackendDHCPv6Impl::INSERT_SUBNET6,
+                              in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            deletePools6(subnet);
+            deletePdPools6(subnet);
+            deleteOptions6(ServerSelector::ANY(), subnet);
+
+            // Need to add two more bindings for WHERE clause.
+            in_bindings.push_back(MySqlBinding::createInteger<uint32_t>(subnet->getID()));
+            in_bindings.push_back(MySqlBinding::createString(subnet->toText()));
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::UPDATE_SUBNET6,
+                                    in_bindings);
+
+            MySqlBindingCollection in_server_bindings = {
+                MySqlBinding::createInteger<uint32_t>(subnet->getID())
+            };
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_SERVER,
+                                    in_server_bindings);
+        }
+
+        // Insert associations with the servers.
+        attachElementToServers(MySqlConfigBackendDHCPv6Impl::INSERT_SUBNET6_SERVER,
+                               server_selector,
+                               MySqlBinding::createInteger<uint32_t>(subnet->getID()),
+                               MySqlBinding::createTimestamp(subnet->getModificationTime()));
+
+        // (Re)create pools.
+        for (auto pool : subnet->getPools(Lease::TYPE_NA)) {
+            createPool6(server_selector, boost::dynamic_pointer_cast<Pool6>(pool),
+                        subnet);
+        }
+
+        // (Re)create pd pools.
+        for (auto pd_pool : subnet->getPools(Lease::TYPE_PD)) {
+            createPdPool6(server_selector, boost::dynamic_pointer_cast<Pool6>(pd_pool),
+                          subnet);
+        }
+
+        // (Re)create options.
+        auto option_spaces = subnet->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = subnet->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption6(server_selector, subnet->getID(), desc_copy,
+                                    true);
+            }
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Inserts new IPv6 pool to the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool Pointer to the pool to be inserted.
+    /// @param subnet Pointer to the subnet that this pool belongs to.
+    void createPool6(const ServerSelector& server_selector,
+                     const Pool6Ptr& pool,
+                     const Subnet6Ptr& subnet) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(pool->getFirstAddress().toText()),
+            MySqlBinding::createString(pool->getLastAddress().toText()),
+            MySqlBinding::createInteger<uint32_t>(static_cast<uint32_t>(subnet->getID())),
+            MySqlBinding::condCreateString(pool->getClientClass()),
+            createInputRequiredClassesBinding(pool),
+            createInputContextBinding(pool),
+            MySqlBinding::createTimestamp(subnet->getModificationTime())
+        };
+
+        // Run INSERT.
+        conn_.insertQuery(INSERT_POOL6, in_bindings);
+
+        uint64_t pool_id = mysql_insert_id(conn_.mysql_);
+        auto option_spaces = pool->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = pool->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption6(server_selector, Lease::TYPE_NA,
+                                    pool_id, desc_copy, true);
+            }
+        }
+    }
+
+    /// @brief Inserts new IPv6 pd pool to the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pd_pool Pointer to the pd pool to be inserted.
+    /// @param subnet Pointer to the subnet that this pd pool belongs to.
+    void createPdPool6(const ServerSelector& server_selector,
+                       const Pool6Ptr& pd_pool,
+                       const Subnet6Ptr& subnet) {
+        int plen = prefixLengthFromRange(pd_pool->getFirstAddress(),
+                                         pd_pool->getLastAddress());
+
+        // Extract excluded prefix components.
+        Optional<std::string> xprefix_txt;
+        uint8_t xlen = 0;
+        const Option6PDExcludePtr& xopt = pd_pool->getPrefixExcludeOption();
+        if (xopt) {
+            const IOAddress& prefix = pd_pool->getFirstAddress();
+            const IOAddress& xprefix = xopt->getExcludedPrefix(prefix, pd_pool->getLength());
+            xprefix_txt = xprefix.toText();
+            xlen = xopt->getExcludedPrefixLength();
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(pd_pool->getFirstAddress().toText()),
+            MySqlBinding::createInteger<uint8_t>(static_cast<uint8_t>(plen)),
+            MySqlBinding::createInteger<uint8_t>(pd_pool->getLength()),
+            MySqlBinding::createInteger<uint32_t>(static_cast<uint32_t>(subnet->getID())),
+            MySqlBinding::condCreateString(xprefix_txt),
+            MySqlBinding::createInteger<uint8_t>(xlen),
+            MySqlBinding::condCreateString(pd_pool->getClientClass()),
+            createInputRequiredClassesBinding(pd_pool),
+            createInputContextBinding(pd_pool),
+            MySqlBinding::createTimestamp(subnet->getModificationTime())
+        };
+
+        // Run INSERT.
+        conn_.insertQuery(INSERT_PD_POOL, in_bindings);
+
+        uint64_t pd_pool_id = mysql_insert_id(conn_.mysql_);
+        auto option_spaces = pd_pool->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = pd_pool->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption6(server_selector, Lease::TYPE_PD,
+                                    pd_pool_id, desc_copy, true);
+            }
+        }
+    }
+
+    /// @brief Sends a query to delete data from a table.
+    ///
+    /// If creates a new audit revision for this change if such audit
+    /// revision doesn't exist yet (using ScopedAuditRevision mechanism).
+    ///
+    /// @tparam Args type of the arguments to be passed to one of the existing
+    /// @c deleteFromTable methods.
+    /// @param server_selector server selector.
+    /// @param operation operation which results in calling this function. This is
+    /// used for logging purposes.
+    /// @param log_message log message to be associated with the audit revision.
+    /// @param cascade_delete boolean flag indicating if we're performing
+    /// cascade delete. If set to true, the audit entries for the child
+    /// objects (e.g. DHCPoptions) won't be created.
+    /// @param keys arguments to be passed to one of the existing
+    /// @c deleteFromTable methods.
+    ///
+    /// @return Number of deleted entries.
+    template<typename... Args>
+    uint64_t deleteTransactional(const int index,
+                                 const db::ServerSelector& server_selector,
+                                 const std::string& operation,
+                                 const std::string& log_message,
+                                 const bool cascade_delete,
+                                 Args&&... keys) {
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, log_message, cascade_delete);
+
+        auto count = deleteFromTable(index, server_selector, operation, keys...);
+
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Sends query to delete subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    uint64_t deleteSubnet6(const ServerSelector& server_selector,
+                           const SubnetID& subnet_id) {
+        int index = (server_selector.amAny() ?
+                     MySqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_ID_ANY :
+                     MySqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_ID_WITH_TAG);
+        return (deleteTransactional(index, server_selector,
+                                    "deleting a subnet", "subnet deleted",
+                                    true, static_cast<uint32_t>(subnet_id)));
+    }
+
+    /// @brief Sends query to delete subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    uint64_t deleteSubnet6(const ServerSelector& server_selector,
+                           const std::string& subnet_prefix) {
+        int index = (server_selector.amAny() ?
+                     MySqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_PREFIX_ANY :
+                     MySqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_PREFIX_WITH_TAG);
+        return (deleteTransactional(index, server_selector,
+                                    "deleting a subnet", "subnet deleted",
+                                    true, subnet_prefix));
+    }
+
+    /// @brief Deletes pools belonging to a subnet from the database.
+    ///
+    /// The query deletes all pools associated with the subnet's
+    /// identifier or prefix.
+    /// @param subnet Pointer to the subnet for which pools should be
+    /// deleted.
+    uint64_t deletePools6(const Subnet6Ptr& subnet) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint32_t>(subnet->getID()),
+            MySqlBinding::createString(subnet->toText())
+        };
+
+        // Run DELETE.
+        return (conn_.updateDeleteQuery(DELETE_POOLS6, in_bindings));
+    }
+
+    /// @brief Deletes prefix delegation pools belonging to a subnet from
+    /// the database.
+    ///
+    /// The query deletes all pd pools associated with the subnet's
+    /// identifier or prefix.
+    /// @param subnet Pointer to the subnet for which pd pools should be
+    /// deleted.
+    uint64_t deletePdPools6(const Subnet6Ptr& subnet) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint32_t>(subnet->getID()),
+            MySqlBinding::createString(subnet->toText())
+        };
+
+        // Run DELETE.
+        return (conn_.updateDeleteQuery(DELETE_PD_POOLS, in_bindings));
+    }
+
+    /// @brief Sends query to the database to retrieve multiple shared
+    /// networks.
+    ///
+    /// Query should order shared networks by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] shared_networks Reference to the container where fetched
+    /// shared networks will be inserted.
+    void getSharedNetworks6(const StatementIndex& index,
+                            const ServerSelector& server_selector,
+                            const MySqlBindingCollection& in_bindings,
+                            SharedNetwork6Collection& shared_networks) {
+        // Create output bindings. The order must match that in the prepared
+        // statement. Please put comments only at the end of line so
+        // line counting and indexing match.
+        // The server tag must be the last field.
+        MySqlBindingCollection out_bindings = {
+            MySqlBinding::createInteger<uint64_t>(), // id
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // name
+            MySqlBinding::createString(CLIENT_CLASS_BUF_LENGTH), // client_class
+            MySqlBinding::createString(INTERFACE_BUF_LENGTH), // interface
+            MySqlBinding::createTimestamp(), // modification_ts
+            MySqlBinding::createInteger<uint32_t>(), // preferred_lifetime
+            MySqlBinding::createInteger<uint8_t>(), // rapid_commit
+            MySqlBinding::createInteger<uint32_t>(), // rebind_timer
+            MySqlBinding::createString(RELAY_BUF_LENGTH), // relay
+            MySqlBinding::createInteger<uint32_t>(), // renew_timer
+            MySqlBinding::createString(REQUIRE_CLIENT_CLASSES_BUF_LENGTH), // require_client_classes
+            MySqlBinding::createInteger<uint8_t>(), // reservations_global
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // user_context
+            MySqlBinding::createInteger<uint32_t>(), // valid_lifetime
+            MySqlBinding::createInteger<uint64_t>(), // option: option_id
+            MySqlBinding::createInteger<uint16_t>(), // option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // option: space
+            MySqlBinding::createInteger<uint8_t>(), // option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // option: dhcp6_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // option: pool_id
+            MySqlBinding::createTimestamp(), // option: modification_ts
+            MySqlBinding::createInteger<uint64_t>(), // option: pd_pool_id
+            MySqlBinding::createInteger<uint8_t>(), // calculate_tee_times
+            MySqlBinding::createInteger<float>(), // t1_percent
+            MySqlBinding::createInteger<float>(), // t2_percent
+            MySqlBinding::createBlob(INTERFACE_ID_BUF_LENGTH), // interface_id
+            MySqlBinding::createInteger<uint32_t>(), // min_preferred_lifetime
+            MySqlBinding::createInteger<uint32_t>(), // max_preferred_lifetime
+            MySqlBinding::createInteger<uint32_t>(), // min_valid_lifetime
+            MySqlBinding::createInteger<uint32_t>(), // max_valid_lifetime
+            MySqlBinding::createInteger<uint8_t>(), // ddns_send_updates
+            MySqlBinding::createInteger<uint8_t>(), // ddns_override_no_update
+            MySqlBinding::createInteger<uint8_t>(), // ddns_override_client_update
+            MySqlBinding::createInteger<uint8_t>(), // ddns_replace_client_name
+            MySqlBinding::createString(DNS_NAME_BUF_LENGTH), // ddns_generated_prefix
+            MySqlBinding::createString(DNS_NAME_BUF_LENGTH), // ddns_qualifying_suffix
+            MySqlBinding::createInteger<uint8_t>(), // reservations_in_subnet
+            MySqlBinding::createInteger<uint8_t>(), // reservations_out_of_pool
+            MySqlBinding::createInteger<float>(), // cache_threshold
+            MySqlBinding::createInteger<uint32_t>(), // cache_max_age
+            MySqlBinding::createString(ALLOCATOR_TYPE_BUF_LENGTH), // allocator
+            MySqlBinding::createString(ALLOCATOR_TYPE_BUF_LENGTH), // pd_allocator
+            MySqlBinding::createString(SERVER_TAG_BUF_LENGTH) // server_tag
+        };
+
+        uint64_t last_network_id = 0;
+        uint64_t last_option_id = 0;
+        std::string last_tag;
+
+        conn_.selectQuery(index, in_bindings, out_bindings,
+                          [this, &shared_networks, &last_network_id, &last_option_id,
+                           &last_tag]
+                          (MySqlBindingCollection& out_bindings) {
+            SharedNetwork6Ptr last_network;
+            if (!shared_networks.empty()) {
+                last_network = *shared_networks.rbegin();
+            }
+
+            // If this is the first shared network or the shared network id in this
+            // row points to the next shared network we use the data in the
+            // row to create the new shared network instance.
+            if (last_network_id != out_bindings[0]->getInteger<uint64_t>()) {
+                // Reset per shared network component tracking and server tag because
+                // we're now starting to process a new shared network.
+                last_option_id = 0;
+                last_tag.clear();
+
+                // id at 0.
+                last_network_id = out_bindings[0]->getInteger<uint64_t>();
+
+                // name at 1.
+                last_network = SharedNetwork6::create(out_bindings[1]->getString());
+                last_network->setId(last_network_id);
+
+                // client_class at 2.
+                if (!out_bindings[2]->amNull()) {
+                    last_network->allowClientClass(out_bindings[2]->getString());
+                }
+
+                // interface at 3.
+                if (!out_bindings[3]->amNull()) {
+                    last_network->setIface(out_bindings[3]->getString());
+                }
+
+                // modification_ts at 4.
+                last_network->setModificationTime(out_bindings[4]->getTimestamp());
+
+                // preferred_lifetime at 5.
+                // min_preferred_lifetime at 32.
+                // max_preferred_lifetime at 33.
+                if (!out_bindings[5]->amNull()) {
+                    last_network->setPreferred(createTriplet(out_bindings[5],
+                                                             out_bindings[32],
+                                                             out_bindings[33]));
+                }
+
+                // rapid_commit at 6.
+                if (!out_bindings[6]->amNull()) {
+                    last_network->setRapidCommit(out_bindings[6]->getBool());
+                }
+
+                // rebind_timer at 7.
+                if (!out_bindings[7]->amNull()) {
+                    last_network->setT2(createTriplet(out_bindings[7]));
+                }
+
+                // relay at 8.
+                ElementPtr relay_element = out_bindings[8]->getJSON();
+                if (relay_element) {
+                    if (relay_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid relay value "
+                                  << out_bindings[8]->getString());
+                    }
+                    for (auto i = 0; i < relay_element->size(); ++i) {
+                        auto relay_address_element = relay_element->get(i);
+                        if (relay_address_element->getType() != Element::string) {
+                            isc_throw(BadValue, "relay address must be a string");
+                        }
+                        last_network->addRelayAddress(IOAddress(relay_element->get(i)->stringValue()));
+                    }
+                }
+
+                // renew_timer at 9.
+                if (!out_bindings[9]->amNull()) {
+                    last_network->setT1(createTriplet(out_bindings[9]));
+                }
+
+                // require_client_classes at 10.
+                ElementPtr require_element = out_bindings[10]->getJSON();
+                if (require_element) {
+                    if (require_element->getType() != Element::list) {
+                        isc_throw(BadValue, "invalid require_client_classes value "
+                              << out_bindings[10]->getString());
+                    }
+                    for (auto i = 0; i < require_element->size(); ++i) {
+                        auto require_item = require_element->get(i);
+                        if (require_item->getType() != Element::string) {
+                            isc_throw(BadValue, "elements of require_client_classes list must"
+                                      "be valid strings");
+                        }
+                        last_network->requireClientClass(require_item->stringValue());
+                    }
+                }
+
+                // reservations_global at 11.
+                if (!out_bindings[11]->amNull()) {
+                    last_network->setReservationsGlobal(out_bindings[11]->getBool());
+                }
+
+                // user_context at 12.
+                ElementPtr user_context = out_bindings[12]->getJSON();
+                if (user_context) {
+                    last_network->setContext(user_context);
+                }
+
+                // valid_lifetime at 13.
+                // min_valid_lifetime at 34.
+                // max_valid_lifetime at 35.
+                if (!out_bindings[13]->amNull()) {
+                    last_network->setValid(createTriplet(out_bindings[13],
+                                                         out_bindings[34],
+                                                         out_bindings[35]));
+                }
+
+                // 14 to 27 are option.
+
+                // calculate_tee_times at 28.
+                if (!out_bindings[28]->amNull()) {
+                    last_network->setCalculateTeeTimes(out_bindings[28]->getBool());
+                }
+
+                // t1_percent at 29.
+                if (!out_bindings[29]->amNull()) {
+                    last_network->setT1Percent(out_bindings[29]->getFloat());
+                }
+
+                // t2_percent at 30.
+                if (!out_bindings[30]->amNull()) {
+                    last_network->setT2Percent(out_bindings[30]->getFloat());
+                }
+
+                // interface_id at 31.
+                if (!out_bindings[31]->amNull()) {
+                    auto iface_id_data = out_bindings[31]->getBlob();
+                    if (!iface_id_data.empty()) {
+                        OptionPtr opt_iface_id(new Option(Option::V6, D6O_INTERFACE_ID,
+                                                          iface_id_data));
+                        last_network->setInterfaceId(opt_iface_id);
+                    }
+                }
+
+                // min_preferred_lifetime at 32.
+                // max_preferred_lifetime at 33.
+                // min_valid_lifetime at 34.
+                // max_valid_lifetime at 35.
+
+                // ddns_send_updates at 36.
+                if (!out_bindings[36]->amNull()) {
+                    last_network->setDdnsSendUpdates(out_bindings[36]->getBool());
+                }
+
+                // ddns_override_no_update at 37.
+                if (!out_bindings[37]->amNull()) {
+                    last_network->setDdnsOverrideNoUpdate(out_bindings[37]->getBool());
+                }
+
+                // ddns_override_client_update at 38.
+                if (!out_bindings[38]->amNull()) {
+                    last_network->setDdnsOverrideClientUpdate(out_bindings[38]->getBool());
+                }
+
+                // ddns_replace_client_name at 39.
+                if (!out_bindings[39]->amNull()) {
+                    last_network->setDdnsReplaceClientNameMode(static_cast<D2ClientConfig::ReplaceClientNameMode>
+                        (out_bindings[39]->getInteger<uint8_t>()));
+                }
+
+                // ddns_generated_prefix at 40.
+                if (!out_bindings[40]->amNull()) {
+                    last_network->setDdnsGeneratedPrefix(out_bindings[40]->getString());
+                }
+
+                // ddns_qualifying_suffix at 41.
+                if (!out_bindings[41]->amNull()) {
+                    last_network->setDdnsQualifyingSuffix(out_bindings[41]->getString());
+                }
+
+                // reservations_in_subnet at 42.
+                if (!out_bindings[42]->amNull()) {
+                    last_network->setReservationsInSubnet(out_bindings[42]->getBool());
+                }
+
+                // reservations_in_subnet at 43.
+                if (!out_bindings[43]->amNull()) {
+                    last_network->setReservationsOutOfPool(out_bindings[43]->getBool());
+                }
+
+                // cache_threshold at 44.
+                if (!out_bindings[44]->amNull()) {
+                    last_network->setCacheThreshold(out_bindings[44]->getFloat());
+                }
+
+                // cache_max_age at 45.
+                if (!out_bindings[45]->amNull()) {
+                    last_network->setCacheMaxAge(out_bindings[45]->getInteger<uint32_t>());
+                }
+
+                // allocator at 46.
+                if (!out_bindings[46]->amNull()) {
+                    last_network->setAllocatorType(out_bindings[46]->getString());
+                }
+
+                // pd_allocator at 47.
+                if (!out_bindings[47]->amNull()) {
+                    last_network->setPdAllocatorType(out_bindings[47]->getString());
+                }
+
+                // server_tag at 48.
+
+                // Add the shared network.
+                auto ret = shared_networks.push_back(last_network);
+
+                // shared_networks is a multi index container with an unique
+                // index but this index is unique too in the database,
+                // so this is for sanity only.
+                if (!ret.second) {
+                    isc_throw(Unexpected, "add shared network failed");
+                }
+            }
+
+            // Check for new server tags.
+            if (!out_bindings[48]->amNull() &&
+                (last_tag != out_bindings[48]->getString())) {
+                last_tag = out_bindings[48]->getString();
+                if (!last_tag.empty() && !last_network->hasServerTag(ServerTag(last_tag))) {
+                    last_network->setServerTag(last_tag);
+                }
+            }
+
+            // Parse option from 14 to 27.
+            if (!out_bindings[14]->amNull() &&
+                (last_option_id < out_bindings[14]->getInteger<uint64_t>())) {
+                last_option_id = out_bindings[14]->getInteger<uint64_t>();
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, out_bindings.begin() + 14);
+                if (desc) {
+                    last_network->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        // Now that we're done fetching the whole network, we have to
+        // check if it has matching server tags and toss it if it
+        // doesn't. We skip matching the server tags if we're asking
+        // for ANY shared network.
+        auto& sn_index = shared_networks.get<SharedNetworkRandomAccessIndexTag>();
+        tossNonMatchingElements(server_selector, sn_index);
+    }
+
+    /// @brief Sends query to retrieve single shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Shared network name.
+    ///
+    /// @return Pointer to the returned shared network or NULL if such shared
+    /// network doesn't exist.
+    SharedNetwork6Ptr getSharedNetwork6(const ServerSelector& server_selector,
+                                        const std::string& name) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a shared network. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        MySqlBindingCollection in_bindings = { MySqlBinding::createString(name) };
+
+        auto index = GET_SHARED_NETWORK6_NAME_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = GET_SHARED_NETWORK6_NAME_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = GET_SHARED_NETWORK6_NAME_ANY;
+        }
+
+        SharedNetwork6Collection shared_networks;
+        getSharedNetworks6(index, server_selector, in_bindings, shared_networks);
+
+        return (shared_networks.empty() ? SharedNetwork6Ptr() : *shared_networks.begin());
+    }
+
+    /// @brief Sends query to retrieve all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] shared_networks Reference to the shared networks collection
+    /// structure where shared networks should be inserted.
+    void getAllSharedNetworks6(const ServerSelector& server_selector,
+                               SharedNetwork6Collection& shared_networks) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching all shared networks for ANY "
+                      "server is not supported");
+        }
+
+        auto index = (server_selector.amUnassigned() ? GET_ALL_SHARED_NETWORKS6_UNASSIGNED :
+                      GET_ALL_SHARED_NETWORKS6);
+        MySqlBindingCollection in_bindings;
+        getSharedNetworks6(index, server_selector, in_bindings, shared_networks);
+    }
+
+    /// @brief Sends query to retrieve modified shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] shared_networks Reference to the shared networks collection
+    /// structure where shared networks should be inserted.
+    void getModifiedSharedNetworks6(const ServerSelector& server_selector,
+                                    const boost::posix_time::ptime& modification_ts,
+                                    SharedNetwork6Collection& shared_networks) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified shared networks for ANY "
+                      "server is not supported");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createTimestamp(modification_ts)
+        };
+
+        auto index = (server_selector.amUnassigned() ? GET_MODIFIED_SHARED_NETWORKS6_UNASSIGNED :
+                      GET_MODIFIED_SHARED_NETWORKS6);
+        getSharedNetworks6(index, server_selector, in_bindings, shared_networks);
+    }
+
+    /// @brief Sends query to insert or update shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the shared network to be inserted or updated.
+    void createUpdateSharedNetwork6(const ServerSelector& server_selector,
+                                    const SharedNetwork6Ptr& shared_network) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "creating or updating a shared network for ANY"
+                      " server is not supported");
+
+        } else if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        // Create the binding holding interface_id.
+        MySqlBindingPtr interface_id_binding = MySqlBinding::createNull();
+        auto opt_iface_id = shared_network->getInterfaceId(Network::Inheritance::NONE);
+        if (opt_iface_id) {
+            auto iface_id_data = opt_iface_id->getData();
+            if (!iface_id_data.empty()) {
+                interface_id_binding = MySqlBinding::createBlob(iface_id_data.begin(),
+                                                                iface_id_data.end());
+            }
+        }
+
+        // Create binding for DDNS replace client name mode.
+        MySqlBindingPtr ddns_rcn_mode_binding;
+        auto ddns_rcn_mode = shared_network->getDdnsReplaceClientNameMode(Network::Inheritance::NONE);
+        if (!ddns_rcn_mode.unspecified()) {
+            ddns_rcn_mode_binding = MySqlBinding::createInteger<uint8_t>(static_cast<uint8_t>
+                                                                         (ddns_rcn_mode.get()));
+        } else {
+            ddns_rcn_mode_binding = MySqlBinding::createNull();
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(shared_network->getName()),
+            MySqlBinding::condCreateString(shared_network->getClientClass(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(shared_network->getIface(Network::Inheritance::NONE)),
+            MySqlBinding::createTimestamp(shared_network->getModificationTime()),
+            createBinding(shared_network->getPreferred(Network::Inheritance::NONE)),
+            createMinBinding(shared_network->getPreferred(Network::Inheritance::NONE)),
+            createMaxBinding(shared_network->getPreferred(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getRapidCommit(Network::Inheritance::NONE)),
+            createBinding(shared_network->getT2(Network::Inheritance::NONE)),
+            createInputRelayBinding(shared_network),
+            createBinding(shared_network->getT1(Network::Inheritance::NONE)),
+            createInputRequiredClassesBinding(shared_network),
+            MySqlBinding::condCreateBool(shared_network->getReservationsGlobal(Network::Inheritance::NONE)),
+            createInputContextBinding(shared_network),
+            createBinding(shared_network->getValid(Network::Inheritance::NONE)),
+            createMinBinding(shared_network->getValid(Network::Inheritance::NONE)),
+            createMaxBinding(shared_network->getValid(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getCalculateTeeTimes(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(shared_network->getT1Percent(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(shared_network->getT2Percent(Network::Inheritance::NONE)),
+            interface_id_binding,
+            MySqlBinding::condCreateBool(shared_network->getDdnsSendUpdates(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getDdnsOverrideNoUpdate(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getDdnsOverrideClientUpdate(Network::Inheritance::NONE)),
+            ddns_rcn_mode_binding,
+            MySqlBinding::condCreateString(shared_network->getDdnsGeneratedPrefix(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(shared_network->getDdnsQualifyingSuffix(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getReservationsInSubnet(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateBool(shared_network->getReservationsOutOfPool(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateFloat(shared_network->getCacheThreshold(Network::Inheritance::NONE)),
+            condCreateInteger<uint32_t>(shared_network->getCacheMaxAge(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(shared_network->getAllocatorType(Network::Inheritance::NONE)),
+            MySqlBinding::condCreateString(shared_network->getPdAllocatorType(Network::Inheritance::NONE))
+        };
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "shared network set", true);
+
+        try {
+
+            // Try to insert shared network. The shared network name must be unique,
+            // so if inserting fails with DuplicateEntry exception we'll need to
+            // update existing shared network entry.
+            conn_.insertQuery(MySqlConfigBackendDHCPv6Impl::INSERT_SHARED_NETWORK6,
+                              in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            deleteOptions6(ServerSelector::ANY(), shared_network);
+
+            // Need to add one more binding for WHERE clause.
+            in_bindings.push_back(MySqlBinding::createString(shared_network->getName()));
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::UPDATE_SHARED_NETWORK6,
+                                    in_bindings);
+
+            MySqlBindingCollection in_server_bindings = {
+                MySqlBinding::createString(shared_network->getName())
+            };
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_SERVER,
+                                    in_server_bindings);
+        }
+
+        // Associate the shared network with the servers.
+        attachElementToServers(MySqlConfigBackendDHCPv6Impl::INSERT_SHARED_NETWORK6_SERVER,
+                               server_selector,
+                               MySqlBinding::createString(shared_network->getName()),
+                               MySqlBinding::createTimestamp(shared_network->getModificationTime()));
+
+        // (Re)create options.
+        auto option_spaces = shared_network->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = shared_network->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption6(server_selector, shared_network->getName(),
+                                    desc_copy, true);
+            }
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert DHCP option.
+    ///
+    /// This method expects that the server selector contains exactly one
+    /// server tag.
+    ///
+    /// @param server_selector Server selector.
+    /// @param in_bindings Collection of bindings representing an option.
+    void insertOption6(const ServerSelector& server_selector,
+                       const MySqlBindingCollection& in_bindings) {
+        conn_.insertQuery(MySqlConfigBackendDHCPv6Impl::INSERT_OPTION6,
+                          in_bindings);
+
+        // Fetch primary key value of the inserted option. We will use it in the
+        // next INSERT statement to associate this option with the server.
+        auto option_id = mysql_insert_id(conn_.mysql_);
+
+        // Timestamp is expected to be in this input binding.
+        auto timestamp_binding = in_bindings[12];
+
+        // Associate the option with the servers.
+        attachElementToServers(MySqlConfigBackendDHCPv6Impl::INSERT_OPTION6_SERVER,
+                               server_selector,
+                               MySqlBinding::createInteger<uint64_t>(option_id),
+                               timestamp_binding);
+    }
+
+    /// @brief Sends query to insert or update global DHCP option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const OptionDescriptorPtr& option) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        auto tag = getServerTag(server_selector, "creating or updating global option");
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint16_t>(option->option_->getType()),
+            createOptionValueBinding(option),
+            MySqlBinding::condCreateString(option->formatted_value_),
+            MySqlBinding::condCreateString(option->space_name_),
+            MySqlBinding::createBool(option->persistent_),
+            MySqlBinding::createBool(option->cancelled_),
+            MySqlBinding::createNull(),
+            MySqlBinding::createNull(),
+            MySqlBinding::createInteger<uint8_t>(0),
+            createInputContextBinding(option),
+            MySqlBinding::createNull(),
+            MySqlBinding::createNull(),
+            MySqlBinding::createTimestamp(option->getModificationTime()),
+            MySqlBinding::createNull(),
+            MySqlBinding::createString(tag),
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            MySqlBinding::condCreateString(option->space_name_)
+        };
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "global option set", false);
+
+        if (conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION6,
+                                    in_bindings) == 0) {
+            // Remove the 3 bindings used only in case of update.
+            in_bindings.resize(in_bindings.size() - 3);
+            insertOption6(server_selector, in_bindings);
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. subnet.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const SubnetID& subnet_id,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint16_t>(option->option_->getType()),
+            createOptionValueBinding(option),
+            MySqlBinding::condCreateString(option->formatted_value_),
+            MySqlBinding::condCreateString(option->space_name_),
+            MySqlBinding::createBool(option->persistent_),
+            MySqlBinding::createBool(option->cancelled_),
+            MySqlBinding::createNull(),
+            MySqlBinding::createInteger<uint32_t>(static_cast<uint32_t>(subnet_id)),
+            MySqlBinding::createInteger<uint8_t>(1),
+            createInputContextBinding(option),
+            MySqlBinding::createNull(),
+            MySqlBinding::createNull(),
+            MySqlBinding::createTimestamp(option->getModificationTime()),
+            MySqlBinding::createNull(),
+            MySqlBinding::createInteger<uint32_t>(static_cast<uint32_t>(subnet_id)),
+            MySqlBinding::createInteger<uint16_t>(option->option_->getType()),
+            MySqlBinding::condCreateString(option->space_name_)
+        };
+
+        boost::scoped_ptr<MySqlTransaction> transaction;
+        // Only start new transaction if specified to do so. This function may
+        // be called from within an existing transaction in which case we
+        // don't start the new one.
+        if (!cascade_update) {
+            transaction.reset(new MySqlTransaction(conn_));
+        }
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "subnet specific option set",
+                           cascade_update);
+
+        if (conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_SUBNET_ID,
+                                    in_bindings) == 0) {
+            // Remove the 3 bindings used only in case of update.
+            in_bindings.resize(in_bindings.size() - 3);
+            insertOption6(server_selector, in_bindings);
+        }
+
+        if (transaction) {
+            transaction->commit();
+        }
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a pool.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool.
+    /// @param pool_end_address Upper bound address of the pool.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const IOAddress& pool_start_address,
+                             const IOAddress& pool_end_address,
+                             const OptionDescriptorPtr& option) {
+        uint64_t pool_id = 0;
+        Pool6Ptr pool = getPool6(server_selector, pool_start_address, pool_end_address,
+                                 pool_id);
+        if (!pool) {
+            isc_throw(BadValue, "no pool found for range of "
+                      << pool_start_address << " : "
+                      << pool_end_address);
+        }
+
+        createUpdateOption6(server_selector, Lease::TYPE_NA,
+                            pool_id, option, false);
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a pd pool.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pd_pool_prefix Address part of the pd pool prefix.
+    /// @param pd_pool_prefix_length Length of the pd pool prefix.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const asiolink::IOAddress& pd_pool_prefix,
+                             const uint8_t pd_pool_prefix_length,
+                             const OptionDescriptorPtr& option) {
+        uint64_t pd_pool_id = 0;
+        Pool6Ptr pd_pool = getPdPool6(server_selector,
+                                      pd_pool_prefix,
+                                      pd_pool_prefix_length,
+                                      pd_pool_id);
+        if (!pd_pool) {
+            isc_throw(BadValue, "no prefix delegation pool found for prefix "
+                      << "of " << pd_pool_prefix << "/"
+                      << static_cast<unsigned>(pd_pool_prefix_length));
+        }
+
+        createUpdateOption6(server_selector, Lease::TYPE_PD,
+                            pd_pool_id, option, false);
+    }
+
+    /// @brief Sends query to insert or update DHCP option in an address
+    /// or prefix delegation pool.
+    ///
+    /// @param selector Server selector.
+    /// @param pool_type Pool type (Lease::TYPE_NA or Lease::TYPE_PD).
+    /// @param pool_id Identifier of the address or prefix delegation pool
+    /// the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. subnet.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const Lease::Type& pool_type,
+                             const uint64_t pool_id,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        std::string msg = "creating or updating ";
+        if (pool_type == Lease::TYPE_PD) {
+            msg += "prefix delegation";
+        } else {
+            msg += "address";
+        }
+        msg += " pool level option";
+
+        MySqlBindingCollection in_bindings;
+        // code
+        in_bindings.push_back(MySqlBinding::createInteger<uint16_t>(option->option_->getType()));
+        // value
+        in_bindings.push_back(createOptionValueBinding(option));
+        // formatted_value
+        in_bindings.push_back(MySqlBinding::condCreateString(option->formatted_value_));
+        // space
+        in_bindings.push_back(MySqlBinding::condCreateString(option->space_name_));
+        // persistent
+        in_bindings.push_back(MySqlBinding::createBool(option->persistent_));
+        // cancelled
+        in_bindings.push_back(MySqlBinding::createBool(option->cancelled_));
+        // dhcp_client_class
+        in_bindings.push_back(MySqlBinding::createNull());
+        // dhcp[46]_subnet_id
+        in_bindings.push_back(MySqlBinding::createNull());
+        // scope_id
+        if (pool_type == Lease::TYPE_NA) {
+            in_bindings.push_back(MySqlBinding::createInteger<uint8_t>(5));
+        } else {
+            in_bindings.push_back(MySqlBinding::createInteger<uint8_t>(6));
+        }
+        // user_context
+        in_bindings.push_back(createInputContextBinding(option));
+        // shared_network_name
+        in_bindings.push_back(MySqlBinding::createNull());
+        // pool_id
+        if (pool_type == Lease::TYPE_NA) {
+            in_bindings.push_back(MySqlBinding::createInteger<uint64_t>(pool_id));
+        } else {
+            in_bindings.push_back(MySqlBinding::createNull());
+        }
+        // modification_ts
+        in_bindings.push_back(MySqlBinding::createTimestamp(option->getModificationTime()));
+        // pd_pool_id
+        if (pool_type == Lease::TYPE_PD) {
+            in_bindings.push_back(MySqlBinding::createInteger<uint64_t>(pool_id));
+        } else {
+            in_bindings.push_back(MySqlBinding::createNull());
+        }
+
+        // Insert bindings used only during the update.
+        in_bindings.push_back(MySqlBinding::createInteger<uint64_t>(pool_id));
+        in_bindings.push_back(MySqlBinding::createInteger<uint16_t>(option->option_->getType()));
+        in_bindings.push_back(MySqlBinding::condCreateString(option->space_name_));
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        if (pool_type == Lease::TYPE_PD) {
+            msg = "prefix delegation";
+        } else {
+            msg = "address";
+        }
+        msg += " pool specific option set";
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, msg, cascade_update);
+
+        auto index = (pool_type == Lease::TYPE_NA ?
+                      MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_POOL_ID :
+                      MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_PD_POOL_ID);
+        if (conn_.updateDeleteQuery(index, in_bindings) == 0) {
+            // Remove the 3 bindings used only in case of update.
+            in_bindings.resize(in_bindings.size() - 3);
+            insertOption6(server_selector, in_bindings);
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a shared network.
+    ///
+    /// @param selector Server selector.
+    /// @param shared_network_name Name of the shared network the option
+    /// belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. shared network.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const std::string& shared_network_name,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint16_t>(option->option_->getType()),
+            createOptionValueBinding(option),
+            MySqlBinding::condCreateString(option->formatted_value_),
+            MySqlBinding::condCreateString(option->space_name_),
+            MySqlBinding::createBool(option->persistent_),
+            MySqlBinding::createBool(option->cancelled_),
+            MySqlBinding::createNull(),
+            MySqlBinding::createNull(),
+            MySqlBinding::createInteger<uint8_t>(4),
+            createInputContextBinding(option),
+            MySqlBinding::createString(shared_network_name),
+            MySqlBinding::createNull(),
+            MySqlBinding::createTimestamp(option->getModificationTime()),
+            MySqlBinding::createNull(),
+            MySqlBinding::createString(shared_network_name),
+            MySqlBinding::createInteger<uint16_t>(option->option_->getType()),
+            MySqlBinding::condCreateString(option->space_name_)
+        };
+
+        boost::scoped_ptr<MySqlTransaction> transaction;
+        // Only start new transaction if specified to do so. This function may
+        // be called from within an existing transaction in which case we
+        // don't start the new one.
+        if (!cascade_update) {
+            transaction.reset(new MySqlTransaction(conn_));
+        }
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "shared network specific option set",
+                           cascade_update);
+
+        if (conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::
+                                    UPDATE_OPTION6_SHARED_NETWORK,
+                                    in_bindings) == 0) {
+            // Remove the 3 bindings used only in case of update.
+            in_bindings.resize(in_bindings.size() - 3);
+            insertOption6(server_selector, in_bindings);
+        }
+
+        if (transaction) {
+            transaction->commit();
+        }
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a client class.
+    ///
+    /// @param selector Server selector.
+    /// @param client_class Pointer to the client_class the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option..
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const ClientClassDefPtr& client_class,
+                             const OptionDescriptorPtr& option) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint16_t>(option->option_->getType()),
+            createOptionValueBinding(option),
+            MySqlBinding::condCreateString(option->formatted_value_),
+            MySqlBinding::condCreateString(option->space_name_),
+            MySqlBinding::createBool(option->persistent_),
+            MySqlBinding::createBool(option->cancelled_),
+            MySqlBinding::createString(client_class->getName()),
+            MySqlBinding::createNull(),
+            MySqlBinding::createInteger<uint8_t>(2),
+            createInputContextBinding(option),
+            MySqlBinding::createNull(),
+            MySqlBinding::createNull(),
+            MySqlBinding::createTimestamp(option->getModificationTime()),
+            MySqlBinding::createNull(),
+            MySqlBinding::createString(client_class->getName()),
+            MySqlBinding::createInteger<uint8_t>(option->option_->getType()),
+            MySqlBinding::condCreateString(option->space_name_)
+        };
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "client class specific option set",
+                           true);
+
+        if (conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::
+                                    UPDATE_OPTION6_CLIENT_CLASS,
+                                    in_bindings) == 0) {
+            // Remove the 3 bindings used only in case of update.
+            in_bindings.resize(in_bindings.size() - 3);
+            insertOption6(server_selector, in_bindings);
+        }
+    }
+
+    /// @brief Sends query to insert or update option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Pointer to the option definition to be inserted or updated.
+    void createUpdateOptionDef6(const ServerSelector& server_selector,
+                                const OptionDefinitionPtr& option_def) {
+        createUpdateOptionDef(server_selector, option_def, DHCP6_OPTION_SPACE,
+                              MySqlConfigBackendDHCPv6Impl::GET_OPTION_DEF6_CODE_SPACE,
+                              MySqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6,
+                              MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION_DEF6,
+                              MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                              MySqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6_SERVER);
+    }
+
+    /// @brief Sends query to insert or update option definition
+    /// for a client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Pointer to the option definition to be inserted or updated.
+    /// @param client_class Client class name.
+    void createUpdateOptionDef6(const ServerSelector& server_selector,
+                                const OptionDefinitionPtr& option_def,
+                                const std::string& client_class_name) {
+        createUpdateOptionDef(server_selector, option_def, DHCP6_OPTION_SPACE,
+                              MySqlConfigBackendDHCPv6Impl::GET_OPTION_DEF6_CODE_SPACE,
+                              MySqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6_CLIENT_CLASS,
+                              MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION_DEF6_CLIENT_CLASS,
+                              MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                              MySqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6_SERVER,
+                              client_class_name);
+    }
+
+    /// @brief Sends query to delete option definition by code and
+    /// option space name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Option code.
+    /// @param name Option name.
+    /// @return Number of deleted option definitions.
+    uint64_t deleteOptionDef6(const ServerSelector& server_selector,
+                              const uint16_t code,
+                              const std::string& space) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint16_t>(code),
+            MySqlBinding::createString(space)
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION_DEF6_CODE_NAME, server_selector,
+                                    "deleting option definition",
+                                    "option definition deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Sends query to delete option definitions for a client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the client class for which option
+    /// definitions should be deleted.
+    /// @return Number of deleted option definitions.
+    uint64_t deleteOptionDefs6(const ServerSelector& server_selector,
+                               const ClientClassDefPtr& client_class) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(client_class->getName())
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION_DEFS6_CLIENT_CLASS, server_selector,
+                                    "deleting option definition for a client class",
+                                    "option definition deleted",
+                                    true,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption6(const ServerSelector& server_selector,
+                           const uint16_t code,
+                           const std::string& space) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint16_t>(code),
+            MySqlBinding::createString(space)
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION6, server_selector,
+                                    "deleting global option",
+                                    "global option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to which deleted option
+    /// belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption6(const ServerSelector& server_selector,
+                           const SubnetID& subnet_id,
+                           const uint16_t code,
+                           const std::string& space) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint32_t>(static_cast<uint32_t>(subnet_id)),
+            MySqlBinding::createInteger<uint16_t>(code),
+            MySqlBinding::createString(space)
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION6_SUBNET_ID, server_selector,
+                                    "deleting option for a subnet",
+                                    "subnet specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound pool address.
+    /// @param pool_end_address  Upper bound pool address.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption6(const db::ServerSelector& server_selector,
+                           const IOAddress& pool_start_address,
+                           const IOAddress& pool_end_address,
+                           const uint16_t code,
+                           const std::string& space) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint16_t>(code),
+            MySqlBinding::createString(space),
+            MySqlBinding::createString(pool_start_address.toText()),
+            MySqlBinding::createString(pool_end_address.toText())
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION6_POOL_RANGE, server_selector,
+                                    "deleting option for an address pool",
+                                    "address pool specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes pd pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pd_pool_prefix Address part of the pd pool prefix.
+    /// @param pd_pool_prefix_length Length of the pd pool prefix.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption6(const db::ServerSelector& server_selector,
+                           const asiolink::IOAddress& pd_pool_prefix,
+                           const uint8_t pd_pool_prefix_length,
+                           const uint16_t code,
+                           const std::string& space) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint16_t>(code),
+            MySqlBinding::createString(space),
+            MySqlBinding::createString(pd_pool_prefix.toText()),
+            MySqlBinding::createInteger<uint8_t>(pd_pool_prefix_length)
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION6_PD_POOL, server_selector,
+                                    "deleting option for a prefix delegation pool",
+                                    "prefix delegation pool specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network which deleted
+    /// option belongs to
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption6(const db::ServerSelector& server_selector,
+                           const std::string& shared_network_name,
+                           const uint16_t code,
+                           const std::string& space) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(shared_network_name),
+            MySqlBinding::createInteger<uint16_t>(code),
+            MySqlBinding::createString(space)
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTION6_SHARED_NETWORK, server_selector,
+                                    "deleting option for a shared network",
+                                    "shared network specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a subnet from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet for which options should be
+    /// deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions6(const ServerSelector& server_selector,
+                            const Subnet6Ptr& subnet) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createInteger<uint32_t>(subnet->getID()),
+            MySqlBinding::createString(subnet->toText())
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTIONS6_SUBNET_ID_PREFIX, server_selector,
+                                    "deleting options for a subnet",
+                                    "subnet specific options deleted",
+                                    true,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a shared network from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet for which options should be
+    /// deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions6(const ServerSelector& server_selector,
+                            const SharedNetwork6Ptr& shared_network) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(shared_network->getName())
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTIONS6_SHARED_NETWORK, server_selector,
+                                    "deleting options for a shared network",
+                                    "shared network specific options deleted",
+                                    true,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a client class from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the client class for which options
+    /// should be deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions6(const ServerSelector& server_selector,
+                            const ClientClassDefPtr& client_class) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(client_class->getName())
+        };
+
+        // Run DELETE.
+        return (deleteTransactional(DELETE_OPTIONS6_CLIENT_CLASS, server_selector,
+                                    "deleting options for a client class",
+                                    "client class specific options deleted",
+                                    true,
+                                    in_bindings));
+    }
+
+    /// @brief Common function to retrieve client classes.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] client_classes Reference to a container where fetched client
+    /// classes will be inserted.
+    void getClientClasses6(const StatementIndex& index,
+                           const ServerSelector& server_selector,
+                           const MySqlBindingCollection& in_bindings,
+                           ClientClassDictionary& client_classes) {
+        MySqlBindingCollection out_bindings = {
+            MySqlBinding::createInteger<uint64_t>(), // id
+            MySqlBinding::createString(CLIENT_CLASS_NAME_BUF_LENGTH), // name
+            MySqlBinding::createString(CLIENT_CLASS_TEST_BUF_LENGTH), // test
+            MySqlBinding::createInteger<uint8_t>(), // required
+            MySqlBinding::createInteger<uint32_t>(), // valid lifetime
+            MySqlBinding::createInteger<uint32_t>(), // min valid lifetime
+            MySqlBinding::createInteger<uint32_t>(), // max valid lifetime
+            MySqlBinding::createInteger<uint8_t>(), // depend on known directly
+            MySqlBinding::createInteger<uint8_t>(), // depend on known indirectly
+            MySqlBinding::createTimestamp(), // modification_ts
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // user_context
+            MySqlBinding::createInteger<uint64_t>(), // option def: id
+            MySqlBinding::createInteger<uint16_t>(), // option def: code
+            MySqlBinding::createString(OPTION_NAME_BUF_LENGTH), // option def: name
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // option def: space
+            MySqlBinding::createInteger<uint8_t>(), // option def: type
+            MySqlBinding::createTimestamp(), // option def: modification_ts
+            MySqlBinding::createInteger<uint8_t>(), // option def: array
+            MySqlBinding::createString(OPTION_ENCAPSULATE_BUF_LENGTH), // option def: encapsulate
+            MySqlBinding::createString(OPTION_RECORD_TYPES_BUF_LENGTH), // option def: record_types
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // option def: user_context
+            MySqlBinding::createInteger<uint64_t>(), // option: option_id
+            MySqlBinding::createInteger<uint16_t>(), // option: code
+            MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH), // option: value
+            MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH), // option: formatted_value
+            MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // option: space
+            MySqlBinding::createInteger<uint8_t>(), // option: persistent
+            MySqlBinding::createInteger<uint8_t>(), // option: cancelled
+            MySqlBinding::createInteger<uint32_t>(), // option: dhcp6_subnet_id
+            MySqlBinding::createInteger<uint8_t>(), // option: scope_id
+            MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // option: user_context
+            MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH), // option: shared_network_name
+            MySqlBinding::createInteger<uint64_t>(), // option: pool_id
+            MySqlBinding::createTimestamp(), // option: modification_ts
+            MySqlBinding::createString(SERVER_TAG_BUF_LENGTH),// server tag
+            MySqlBinding::createInteger<uint32_t>(), // preferred lifetime
+            MySqlBinding::createInteger<uint32_t>(), // min preferred lifetime
+            MySqlBinding::createInteger<uint32_t>() // max preferred lifetime
+        };
+
+        std::list<ClientClassDefPtr> class_list;
+        uint64_t last_option_id = 0;
+        uint64_t last_option_def_id = 0;
+        std::string last_tag;
+
+        conn_.selectQuery(index,
+                          in_bindings, out_bindings,
+                          [this, &class_list, &last_option_id, &last_option_def_id, &last_tag]
+                          (MySqlBindingCollection& out_bindings) {
+            ClientClassDefPtr last_client_class;
+            if (!class_list.empty()) {
+                last_client_class = *class_list.rbegin();
+            }
+
+            if (!last_client_class || (last_client_class->getId() != out_bindings[0]->getInteger<uint64_t>())) {
+                last_option_id = 0;
+                last_option_def_id = 0;
+                last_tag.clear();
+
+                auto options = boost::make_shared<CfgOption>();
+                auto option_defs = boost::make_shared<CfgOptionDef>();
+
+                last_client_class = boost::make_shared<ClientClassDef>(out_bindings[1]->getString(),
+                                                                       ExpressionPtr(), options);
+                last_client_class->setCfgOptionDef(option_defs);
+
+                // id
+                last_client_class->setId(out_bindings[0]->getInteger<uint64_t>());
+
+                // name
+                last_client_class->setName(out_bindings[1]->getString());
+
+                // test
+                if (!out_bindings[2]->amNull()) {
+                    last_client_class->setTest(out_bindings[2]->getString());
+                }
+
+                // required
+                if (!out_bindings[3]->amNull()) {
+                    last_client_class->setRequired(out_bindings[3]->getBool());
+                }
+
+                // valid lifetime: default, min, max
+                last_client_class->setValid(createTriplet(out_bindings[4], out_bindings[5], out_bindings[6]));
+
+                // depend on known directly or indirectly
+                last_client_class->setDependOnKnown(out_bindings[7]->getBool() || out_bindings[8]->getBool());
+
+                // modification_ts
+                last_client_class->setModificationTime(out_bindings[9]->getTimestamp());
+
+                // user_context
+                ElementPtr user_context = out_bindings[10]->getJSON();
+                if (user_context) {
+                    last_client_class->setContext(user_context);
+                }
+
+                // preferred lifetime: default, min, max
+                last_client_class->setPreferred(createTriplet(out_bindings[35],
+                                                              out_bindings[36],
+                                                              out_bindings[37]));
+
+                class_list.push_back(last_client_class);
+            }
+
+            // server tag
+            if (!out_bindings[34]->amNull() &&
+                (last_tag != out_bindings[34]->getString())) {
+                last_tag = out_bindings[34]->getString();
+                if (!last_tag.empty() && !last_client_class->hasServerTag(ServerTag(last_tag))) {
+                    last_client_class->setServerTag(last_tag);
+                }
+            }
+
+            // Parse client class specific option definition from 11 to 20.
+            if (!out_bindings[11]->amNull() &&
+                (last_option_def_id < out_bindings[11]->getInteger<uint64_t>())) {
+                last_option_def_id = out_bindings[11]->getInteger<uint64_t>();
+
+                auto def = processOptionDefRow(out_bindings.begin() + 11);
+                if (def) {
+                    last_client_class->getCfgOptionDef()->add(def);
+                }
+            }
+
+            // Parse client class specific option from 21 to 33.
+            if (!out_bindings[21]->amNull() &&
+                (last_option_id < out_bindings[21]->getInteger<uint64_t>())) {
+                last_option_id = out_bindings[21]->getInteger<uint64_t>();
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, out_bindings.begin() + 21);
+                if (desc) {
+                    last_client_class->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        tossNonMatchingElements(server_selector, class_list);
+
+        for (auto c : class_list) {
+            client_classes.addClass(c);
+        }
+    }
+
+    /// @brief Sends query to retrieve a client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the class to be retrieved.
+    /// @return Pointer to the client class or null if the class is not found.
+    ClientClassDefPtr getClientClass6(const ServerSelector& server_selector,
+                                      const std::string& name) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(name)
+        };
+        ClientClassDictionary client_classes;
+        getClientClasses6(MySqlConfigBackendDHCPv6Impl::GET_CLIENT_CLASS6_NAME,
+                          server_selector, in_bindings, client_classes);
+        return (client_classes.getClasses()->empty() ? ClientClassDefPtr() :
+                (*client_classes.getClasses()->begin()));
+    }
+
+    /// @brief Sends query to retrieve all client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] client_classes Reference to the client classes collection
+    /// where retrieved classes will be stored.
+    void getAllClientClasses6(const ServerSelector& server_selector,
+                              ClientClassDictionary& client_classes) {
+        MySqlBindingCollection in_bindings;
+        getClientClasses6(server_selector.amUnassigned() ?
+                          MySqlConfigBackendDHCPv6Impl::GET_ALL_CLIENT_CLASSES6_UNASSIGNED :
+                          MySqlConfigBackendDHCPv6Impl::GET_ALL_CLIENT_CLASSES6,
+                          server_selector, in_bindings, client_classes);
+    }
+
+    /// @brief Sends query to retrieve modified client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] client_classes Reference to the client classes collection
+    /// where retrieved classes will be stored.
+    void getModifiedClientClasses6(const ServerSelector& server_selector,
+                                   const boost::posix_time::ptime& modification_ts,
+                                   ClientClassDictionary& client_classes) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified client classes for ANY "
+                      "server is not supported");
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createTimestamp(modification_ts)
+        };
+        getClientClasses6(server_selector.amUnassigned() ?
+                          GET_MODIFIED_CLIENT_CLASSES6_UNASSIGNED :
+                          GET_MODIFIED_CLIENT_CLASSES6,
+                          server_selector,
+                          in_bindings,
+                          client_classes);
+    }
+
+    /// @brief Upserts client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the upserted client class.
+    /// @param follow_class_name name of the class after which the
+    /// new or updated class should be positioned. An empty value
+    /// causes the class to be appended at the end of the class
+    /// hierarchy.
+    void createUpdateClientClass6(const ServerSelector& server_selector,
+                                  const ClientClassDefPtr& client_class,
+                                  const std::string& follow_class_name) {
+        // We need to evaluate class expression to see if it references any
+        // other classes (dependencies). As part of this evaluation we will
+        // also check if the client class depends on KNOWN/UNKNOWN built-in
+        // classes.
+        std::list<std::string> dependencies;
+        auto depend_on_known = false;
+        if (!client_class->getTest().empty()) {
+            ExpressionPtr expression;
+            ExpressionParser parser;
+            // Parse the test expression. The callback function is normally used to
+            // interrupt config file parsing when one of the classes refers to a
+            // non-existing client class. It returns false in this case. Here,
+            // we use the callback to capture client classes referenced by the
+            // upserted client class and record whether this class depends on
+            // KNOWN/UNKNOWN built-ins. The callback always returns true to avoid
+            // reporting the parsing error. The dependency check is performed later
+            // at the database level.
+            parser.parse(expression, Element::create(client_class->getTest()), AF_INET6,
+                         [&dependencies, &depend_on_known](const ClientClass& client_class) -> bool {
+                if (isClientClassBuiltIn(client_class)) {
+                    if ((client_class == "KNOWN") || (client_class == "UNKNOWN")) {
+                        depend_on_known = true;
+                    }
+                } else {
+                    dependencies.push_back(client_class);
+                }
+                return (true);
+            });
+        }
+
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(client_class->getName()),
+            MySqlBinding::createString(client_class->getTest()),
+            MySqlBinding::createBool(client_class->getRequired()),
+            createBinding(client_class->getValid()),
+            createMinBinding(client_class->getValid()),
+            createMaxBinding(client_class->getValid()),
+            MySqlBinding::createBool(depend_on_known),
+            (follow_class_name.empty() ? MySqlBinding::createNull() :
+             MySqlBinding::createString(follow_class_name)),
+            createBinding(client_class->getPreferred()),
+            createMinBinding(client_class->getPreferred()),
+            createMaxBinding(client_class->getPreferred()),
+            MySqlBinding::createTimestamp(client_class->getModificationTime()),
+            createInputContextBinding(client_class)
+        };
+
+        MySqlTransaction transaction(conn_);
+
+        ScopedAuditRevision audit_revision(this, MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                                           server_selector, "client class set", true);
+        // Keeps track of whether the client class is inserted or updated.
+        auto update = false;
+        try {
+            conn_.insertQuery(MySqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6, in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            // Such class already exists.
+
+            // Delete options and option definitions. They will be re-created from the new class
+            // instance.
+            deleteOptions6(ServerSelector::ANY(), client_class);
+            deleteOptionDefs6(ServerSelector::ANY(), client_class);
+
+            // Try to update the class.
+            in_bindings.push_back(MySqlBinding::createString(client_class->getName()));
+            if (follow_class_name.empty()) {
+                // If position is not specified, leave the class at the same position.
+                // Remove the binding which specifies the position and use different
+                // query.
+                in_bindings.erase(in_bindings.begin() + 10, in_bindings.begin() + 11);
+                conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::UPDATE_CLIENT_CLASS6_SAME_POSITION,
+                                        in_bindings);
+            } else {
+                // Update with specifying the position.
+                conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::UPDATE_CLIENT_CLASS6,
+                                        in_bindings);
+            }
+
+            // Delete class associations with the servers and dependencies. We will re-create
+            // them according to the new class specification.
+            MySqlBindingCollection in_assoc_bindings = {
+                MySqlBinding::createString(client_class->getName())
+            };
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_DEPENDENCY,
+                                    in_assoc_bindings);
+            conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_SERVER,
+                                    in_assoc_bindings);
+            update = true;
+        }
+
+        // Associate client class with the servers.
+        attachElementToServers(MySqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6_SERVER,
+                               server_selector,
+                               MySqlBinding::createString(client_class->getName()),
+                               MySqlBinding::createTimestamp(client_class->getModificationTime()));
+
+        // Iterate over the captured dependencies and try to insert them into the database.
+        for (auto dependency : dependencies) {
+            try {
+                MySqlBindingCollection in_dependency_bindings = {
+                    MySqlBinding::createString(client_class->getName()),
+                    MySqlBinding::createString(dependency)
+                };
+                // We deleted earlier dependencies, so we can simply insert new ones.
+                conn_.insertQuery(MySqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6_DEPENDENCY,
+                                  in_dependency_bindings);
+            } catch (const std::exception& ex) {
+                isc_throw(InvalidOperation, "unmet dependency on client class: " << dependency);
+            }
+        }
+
+        // If we performed client class update we also have to verify that its dependency
+        // on KNOWN/UNKNOWN client classes hasn't changed.
+        if (update) {
+            MySqlBindingCollection in_check_bindings;
+            conn_.insertQuery(MySqlConfigBackendDHCPv6Impl::CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+                              in_check_bindings);
+        }
+
+        // (Re)create option definitions.
+        if (client_class->getCfgOptionDef()) {
+            auto option_defs = client_class->getCfgOptionDef()->getContainer();
+            auto option_spaces = option_defs.getOptionSpaceNames();
+            for (auto option_space : option_spaces) {
+                OptionDefContainerPtr defs = option_defs.getItems(option_space);
+                for (auto def = defs->begin(); def != defs->end(); ++def) {
+                    createUpdateOptionDef6(server_selector, *def, client_class->getName());
+                }
+            }
+        }
+
+        // (Re)create options.
+        auto option_spaces = client_class->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = client_class->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption6(server_selector, client_class, desc_copy);
+            }
+        }
+
+        // All ok. Commit the transaction.
+        transaction.commit();
+    }
+
+    /// @brief Removes client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Removed client class name.
+    /// @return Number of deleted client classes.
+    uint64_t deleteClientClass6(const ServerSelector& server_selector,
+                                const std::string& name) {
+        int index = server_selector.amAny() ?
+            MySqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_ANY :
+            MySqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6;
+
+        uint64_t result = deleteTransactional(index, server_selector,
+                                              "deleting client class",
+                                              "client class deleted",
+                                              true,
+                                              name);
+        return (result);
+    }
+
+    /// @brief Removes unassigned global parameters, global options and
+    /// option definitions.
+    ///
+    /// This function is called when one or more servers are deleted and
+    /// it is likely that there are some orphaned configuration elements
+    /// left in the database. This method removes those elements.
+    void purgeUnassignedConfig() {
+        multipleUpdateDeleteQueries(DELETE_ALL_GLOBAL_PARAMETERS6_UNASSIGNED,
+                                    DELETE_ALL_GLOBAL_OPTIONS6_UNASSIGNED,
+                                    DELETE_ALL_OPTION_DEFS6_UNASSIGNED);
+    }
+
+    /// @brief Attempts to delete a server having a given tag.
+    ///
+    /// @param server_tag Tag of the server to be deleted.
+    /// @return Number of deleted servers.
+    /// @throw isc::InvalidOperation when trying to delete the logical
+    /// server 'all'.
+    uint64_t deleteServer6(const data::ServerTag& server_tag) {
+        // It is not allowed to delete 'all' logical server.
+        if (server_tag.amAll()) {
+            isc_throw(InvalidOperation, "'all' is a name reserved for the server tag which"
+                      " associates the configuration elements with all servers connecting"
+                      " to the database and may not be deleted");
+        }
+
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this, MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           ServerSelector::ALL(), "deleting a server", false);
+
+        // Specify which server should be deleted.
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(server_tag.get())
+        };
+
+        // Attempt to delete the server.
+        auto count = conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::DELETE_SERVER6,
+                                             in_bindings);
+
+        // If we have deleted any servers we have to remove any dangling global
+        // parameters, options and option definitions.
+        if (count > 0) {
+            purgeUnassignedConfig();
+        }
+
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Attempts to delete all servers.
+    ///
+    /// This method deletes all servers added by the user. It does not
+    /// delete the logical server 'all'.
+    ///
+    /// @return Number of deleted servers.
+    uint64_t deleteAllServers6() {
+        MySqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this, MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           ServerSelector::ALL(), "deleting all servers",
+                           false);
+
+        MySqlBindingCollection in_bindings;
+
+        // Attempt to delete the servers.
+        auto count = conn_.updateDeleteQuery(MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SERVERS6,
+                                             in_bindings);
+
+        // If we have deleted any servers we have to remove any dangling global
+        // parameters, options and option definitions.
+        if (count > 0) {
+            purgeUnassignedConfig();
+        }
+
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Attempts to reconnect the server to the config DB backend manager.
+    ///
+    /// This is a self-rescheduling function that attempts to reconnect to the
+    /// server's config DB backends after connectivity to one or more have been
+    /// lost. Upon entry it will attempt to reconnect via
+    /// @ref ConfigBackendDHCPv6Mgr.addBackend.
+    /// If this is successful, DHCP servicing is re-enabled and server returns
+    /// to normal operation.
+    ///
+    /// If reconnection fails and the maximum number of retries has not been
+    /// exhausted, it will schedule a call to itself to occur at the
+    /// configured retry interval. DHCP service remains disabled.
+    ///
+    /// If the maximum number of retries has been exhausted an error is logged
+    /// and the server shuts down.
+    ///
+    /// @param db_reconnect_ctl pointer to the ReconnectCtl containing the
+    /// configured reconnect parameters.
+    /// @return true if connection has been recovered, false otherwise.
+    static bool dbReconnect(ReconnectCtlPtr db_reconnect_ctl) {
+        MultiThreadingCriticalSection cs;
+
+        // Invoke application layer connection lost callback.
+        if (!DatabaseConnection::invokeDbLostCallback(db_reconnect_ctl)) {
+            return (false);
+        }
+
+        bool reopened = false;
+
+        const std::string timer_name = db_reconnect_ctl->timerName();
+
+        // At least one connection was lost.
+        try {
+            auto srv_cfg = CfgMgr::instance().getCurrentCfg();
+            auto config_ctl = srv_cfg->getConfigControlInfo();
+            // Iterate over the configured DBs and instantiate them.
+            for (auto db : config_ctl->getConfigDatabases()) {
+                const std::string& access = db.getAccessString();
+                auto parameters = db.getParameters();
+                if (ConfigBackendDHCPv6Mgr::instance().delBackend(parameters["type"], access, true)) {
+                    ConfigBackendDHCPv6Mgr::instance().addBackend(db.getAccessString());
+                }
+            }
+
+            reopened = true;
+        } catch (const std::exception& ex) {
+            LOG_ERROR(mysql_cb_logger, MYSQL_CB_RECONNECT_ATTEMPT_FAILED6)
+                    .arg(ex.what());
+        }
+
+        if (reopened) {
+            // Cancel the timer.
+            if (TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                TimerMgr::instance()->unregisterTimer(timer_name);
+            }
+
+            // Invoke application layer connection recovered callback.
+            if (!DatabaseConnection::invokeDbRecoveredCallback(db_reconnect_ctl)) {
+                return (false);
+            }
+        } else {
+            if (!db_reconnect_ctl->checkRetries()) {
+                // We're out of retries, log it and initiate shutdown.
+                LOG_ERROR(mysql_cb_logger, MYSQL_CB_RECONNECT_FAILED6)
+                        .arg(db_reconnect_ctl->maxRetries());
+
+                // Cancel the timer.
+                if (TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                    TimerMgr::instance()->unregisterTimer(timer_name);
+                }
+
+                // Invoke application layer connection failed callback.
+                DatabaseConnection::invokeDbFailedCallback(db_reconnect_ctl);
+
+                return (false);
+            }
+
+            LOG_INFO(mysql_cb_logger, MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6)
+                    .arg(db_reconnect_ctl->maxRetries() - db_reconnect_ctl->retriesLeft() + 1)
+                    .arg(db_reconnect_ctl->maxRetries())
+                    .arg(db_reconnect_ctl->retryInterval());
+
+            // Start the timer.
+            if (!TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                TimerMgr::instance()->registerTimer(timer_name,
+                    std::bind(&MySqlConfigBackendDHCPv6Impl::dbReconnect, db_reconnect_ctl),
+                              db_reconnect_ctl->retryInterval(),
+                              asiolink::IntervalTimer::ONE_SHOT);
+            }
+            TimerMgr::instance()->setup(timer_name);
+        }
+
+        return (true);
+    }
+
+};
+
+namespace {
+
+/// @brief Array of tagged statements.
+typedef std::array<TaggedStatement, MySqlConfigBackendDHCPv6Impl::NUM_STATEMENTS>
+TaggedStatementArray;
+
+/// @brief Prepared MySQL statements used by the backend to insert and
+/// retrieve data from the database.
+TaggedStatementArray tagged_statements = { {
+    { MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+      "CALL createAuditRevisionDHCP6(?, ?, ?, ?)"
+    },
+
+    // Verify that dependency on KNOWN/UNKNOWN class has not changed.
+    { MySqlConfigBackendDHCPv6Impl::CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+      "CALL checkDHCPv6ClientClassKnownDependencyChange()"
+    },
+
+    // Select global parameter by name.
+    { MySqlConfigBackendDHCPv6Impl::GET_GLOBAL_PARAMETER6,
+      MYSQL_GET_GLOBAL_PARAMETER(dhcp6, AND g.name = ?)
+    },
+
+    // Select all global parameters.
+    { MySqlConfigBackendDHCPv6Impl::GET_ALL_GLOBAL_PARAMETERS6,
+      MYSQL_GET_GLOBAL_PARAMETER(dhcp6)
+    },
+
+    // Select modified global parameters.
+    { MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_GLOBAL_PARAMETERS6,
+      MYSQL_GET_GLOBAL_PARAMETER(dhcp6, AND g.modification_ts >= ?)
+    },
+
+    // Select subnet by id.
+    { MySqlConfigBackendDHCPv6Impl::GET_SUBNET6_ID_NO_TAG,
+      MYSQL_GET_SUBNET6_NO_TAG(WHERE s.subnet_id = ?)
+    },
+
+    // Select subnet by id without specifying server tags.
+    { MySqlConfigBackendDHCPv6Impl::GET_SUBNET6_ID_ANY,
+      MYSQL_GET_SUBNET6_ANY(WHERE s.subnet_id = ?)
+    },
+
+    // Select unassigned subnet by id.
+    { MySqlConfigBackendDHCPv6Impl::GET_SUBNET6_ID_UNASSIGNED,
+      MYSQL_GET_SUBNET6_UNASSIGNED(AND s.subnet_id = ?)
+    },
+
+    // Select subnet by prefix.
+    { MySqlConfigBackendDHCPv6Impl::GET_SUBNET6_PREFIX_NO_TAG,
+      MYSQL_GET_SUBNET6_NO_TAG(WHERE s.subnet_prefix = ?)
+    },
+
+    // Select subnet by prefix without specifying server tags.
+    { MySqlConfigBackendDHCPv6Impl::GET_SUBNET6_PREFIX_ANY,
+      MYSQL_GET_SUBNET6_ANY(WHERE s.subnet_prefix = ?)
+    },
+
+    // Select unassigned subnet by prefix.
+    { MySqlConfigBackendDHCPv6Impl::GET_SUBNET6_PREFIX_UNASSIGNED,
+      MYSQL_GET_SUBNET6_UNASSIGNED(AND s.subnet_prefix = ?)
+    },
+
+    // Select all subnets.
+    { MySqlConfigBackendDHCPv6Impl::GET_ALL_SUBNETS6,
+      MYSQL_GET_SUBNET6_NO_TAG()
+    },
+
+    // Select all unassigned subnets.
+    { MySqlConfigBackendDHCPv6Impl::GET_ALL_SUBNETS6_UNASSIGNED,
+      MYSQL_GET_SUBNET6_UNASSIGNED()
+    },
+
+    // Select subnets having modification time later than X.
+    { MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_SUBNETS6,
+      MYSQL_GET_SUBNET6_NO_TAG(WHERE s.modification_ts >= ?)
+    },
+
+    // Select modified and unassigned subnets.
+    { MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_SUBNETS6_UNASSIGNED,
+      MYSQL_GET_SUBNET6_UNASSIGNED(AND s.modification_ts >= ?)
+    },
+
+    // Select subnets belonging to a shared network.
+    { MySqlConfigBackendDHCPv6Impl::GET_SHARED_NETWORK_SUBNETS6,
+      MYSQL_GET_SUBNET6_ANY(WHERE s.shared_network_name = ?)
+    },
+
+    // Select pool by address range for a server.
+    { MySqlConfigBackendDHCPv6Impl::GET_POOL6_RANGE,
+      MYSQL_GET_POOL6_RANGE_WITH_TAG(WHERE (srv.tag = ? OR srv.id = 1) AND p.start_address = ? \
+                                     AND p.end_address = ?)
+    },
+
+    // Select pool by address range for any server.
+    { MySqlConfigBackendDHCPv6Impl::GET_POOL6_RANGE_ANY,
+      MYSQL_GET_POOL6_RANGE_NO_TAG(WHERE p.start_address = ? AND p.end_address = ?)
+    },
+
+    // Select prefix delegation pool for a server.
+    { MySqlConfigBackendDHCPv6Impl::GET_PD_POOL,
+      MYSQL_GET_PD_POOL_WITH_TAG(WHERE (srv.tag = ? OR srv.id = 1) \
+                                 AND p.prefix = ? AND p.prefix_length = ?)
+    },
+
+    // Select prefix delegation pool for any server.
+    { MySqlConfigBackendDHCPv6Impl::GET_PD_POOL_ANY,
+      MYSQL_GET_PD_POOL_NO_TAG(WHERE p.prefix = ? AND p.prefix_length = ?)
+    },
+
+    // Select shared network by name.
+    { MySqlConfigBackendDHCPv6Impl::GET_SHARED_NETWORK6_NAME_NO_TAG,
+      MYSQL_GET_SHARED_NETWORK6_NO_TAG(WHERE n.name = ?)
+    },
+
+    // Select shared network by name without specifying server tags.
+    { MySqlConfigBackendDHCPv6Impl::GET_SHARED_NETWORK6_NAME_ANY,
+      MYSQL_GET_SHARED_NETWORK6_ANY(WHERE n.name = ?)
+    },
+
+    // Select unassigned shared network by name.
+    { MySqlConfigBackendDHCPv6Impl::GET_SHARED_NETWORK6_NAME_UNASSIGNED,
+      MYSQL_GET_SHARED_NETWORK6_UNASSIGNED(AND n.name = ?)
+    },
+
+    // Select all shared networks.
+    { MySqlConfigBackendDHCPv6Impl::GET_ALL_SHARED_NETWORKS6,
+      MYSQL_GET_SHARED_NETWORK6_NO_TAG()
+    },
+
+    // Select all unassigned shared networks.
+    { MySqlConfigBackendDHCPv6Impl::GET_ALL_SHARED_NETWORKS6_UNASSIGNED,
+      MYSQL_GET_SHARED_NETWORK6_UNASSIGNED()
+    },
+
+    // Select modified shared networks.
+    { MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_SHARED_NETWORKS6,
+      MYSQL_GET_SHARED_NETWORK6_NO_TAG(WHERE n.modification_ts >= ?)
+    },
+
+    // Select modified and unassigned shared networks.
+    { MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_SHARED_NETWORKS6_UNASSIGNED,
+      MYSQL_GET_SHARED_NETWORK6_UNASSIGNED(AND n.modification_ts >= ?)
+    },
+
+    // Retrieves option definition by code and space.
+    { MySqlConfigBackendDHCPv6Impl::GET_OPTION_DEF6_CODE_SPACE,
+      MYSQL_GET_OPTION_DEF(dhcp6, AND d.code = ? AND d.space = ?)
+    },
+
+    // Retrieves all option definitions.
+    { MySqlConfigBackendDHCPv6Impl::GET_ALL_OPTION_DEFS6,
+      MYSQL_GET_OPTION_DEF(dhcp6)
+    },
+
+    // Retrieves modified option definitions.
+    { MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_OPTION_DEFS6,
+      MYSQL_GET_OPTION_DEF(dhcp6, AND d.modification_ts >= ?)
+    },
+
+    // Retrieves global option by code and space.
+    { MySqlConfigBackendDHCPv6Impl::GET_OPTION6_CODE_SPACE,
+      MYSQL_GET_OPTION6(AND o.scope_id = 0 AND o.code = ? AND o.space = ?)
+    },
+
+    // Retrieves all global options.
+    { MySqlConfigBackendDHCPv6Impl::GET_ALL_OPTIONS6,
+      MYSQL_GET_OPTION6(AND o.scope_id = 0)
+    },
+
+    // Retrieves modified options.
+    { MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_OPTIONS6,
+      MYSQL_GET_OPTION6(AND o.scope_id = 0 AND o.modification_ts >= ?)
+    },
+
+    // Retrieves an option for a given subnet, option code and space.
+    { MySqlConfigBackendDHCPv6Impl::GET_OPTION6_SUBNET_ID_CODE_SPACE,
+      MYSQL_GET_OPTION6(AND o.scope_id = 1 AND o.dhcp6_subnet_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Retrieves an option for a given pool, option code and space.
+    { MySqlConfigBackendDHCPv6Impl::GET_OPTION6_POOL_ID_CODE_SPACE,
+      MYSQL_GET_OPTION6(AND o.scope_id = 5 AND o.pool_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Retrieves an option for a given pd pool, option code and space.
+    { MySqlConfigBackendDHCPv6Impl::GET_OPTION6_PD_POOL_ID_CODE_SPACE,
+      MYSQL_GET_OPTION6(AND o.scope_id = 6 AND o.pd_pool_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Retrieves an option for a given shared network, option code and space.
+    { MySqlConfigBackendDHCPv6Impl::GET_OPTION6_SHARED_NETWORK_CODE_SPACE,
+      MYSQL_GET_OPTION6(AND o.scope_id = 4 AND o.shared_network_name = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Select a client class by name.
+    { MySqlConfigBackendDHCPv6Impl::GET_CLIENT_CLASS6_NAME,
+      MYSQL_GET_CLIENT_CLASS6_WITH_TAG(WHERE c.name = ?)
+    },
+
+    // Select all client classes.
+    { MySqlConfigBackendDHCPv6Impl::GET_ALL_CLIENT_CLASSES6,
+      MYSQL_GET_CLIENT_CLASS6_WITH_TAG()
+    },
+
+    // Select all unassigned client classes.
+    { MySqlConfigBackendDHCPv6Impl::GET_ALL_CLIENT_CLASSES6_UNASSIGNED,
+      MYSQL_GET_CLIENT_CLASS6_UNASSIGNED()
+    },
+
+    // Select modified client classes.
+    { MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_CLIENT_CLASSES6,
+      MYSQL_GET_CLIENT_CLASS6_WITH_TAG(WHERE c.modification_ts >= ?)
+    },
+
+    // Select modified client classes.
+    { MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_CLIENT_CLASSES6_UNASSIGNED,
+      MYSQL_GET_CLIENT_CLASS6_UNASSIGNED(AND c.modification_ts >= ?)
+    },
+
+    // Retrieves the most recent audit entries.
+    { MySqlConfigBackendDHCPv6Impl::GET_AUDIT_ENTRIES6_TIME,
+      MYSQL_GET_AUDIT_ENTRIES_TIME(dhcp6)
+    },
+
+    // Retrieves a server by tag.
+    { MySqlConfigBackendDHCPv6Impl::GET_SERVER6,
+      MYSQL_GET_SERVER(dhcp6)
+    },
+
+    // Retrieves all servers.
+    { MySqlConfigBackendDHCPv6Impl::GET_ALL_SERVERS6,
+      MYSQL_GET_ALL_SERVERS(dhcp6)
+    },
+
+    // Insert global parameter.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_GLOBAL_PARAMETER6,
+      MYSQL_INSERT_GLOBAL_PARAMETER(dhcp6)
+    },
+
+    // Insert association of the global parameter with a server.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_GLOBAL_PARAMETER6_SERVER,
+      MYSQL_INSERT_GLOBAL_PARAMETER_SERVER(dhcp6)
+    },
+
+    // Insert a subnet.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_SUBNET6,
+      "INSERT INTO dhcp6_subnet("
+      "  subnet_id,"
+      "  subnet_prefix,"
+      "  client_class,"
+      "  interface,"
+      "  modification_ts,"
+      "  preferred_lifetime,"
+      "  min_preferred_lifetime,"
+      "  max_preferred_lifetime,"
+      "  rapid_commit,"
+      "  rebind_timer,"
+      "  relay,"
+      "  renew_timer,"
+      "  require_client_classes,"
+      "  reservations_global,"
+      "  shared_network_name,"
+      "  user_context,"
+      "  valid_lifetime,"
+      "  min_valid_lifetime,"
+      "  max_valid_lifetime,"
+      "  calculate_tee_times,"
+      "  t1_percent,"
+      "  t2_percent,"
+      "  interface_id,"
+      "  ddns_send_updates,"
+      "  ddns_override_no_update,"
+      "  ddns_override_client_update,"
+      "  ddns_replace_client_name,"
+      "  ddns_generated_prefix,"
+      "  ddns_qualifying_suffix,"
+      "  reservations_in_subnet,"
+      "  reservations_out_of_pool,"
+      "  cache_threshold,"
+      "  cache_max_age,"
+      "  allocator,"
+      "  pd_allocator"
+      ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?,"
+      " ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)" },
+
+    // Insert association of the subnet with a server.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_SUBNET6_SERVER,
+      MYSQL_INSERT_SUBNET_SERVER(dhcp6)
+    },
+
+    // Insert pool for a subnet.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_POOL6,
+      MYSQL_INSERT_POOL(dhcp6)
+    },
+
+    // Insert pd pool for a subnet.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_PD_POOL,
+      MYSQL_INSERT_PD_POOL()
+    },
+
+    // Insert a shared network.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_SHARED_NETWORK6,
+      "INSERT INTO dhcp6_shared_network("
+      "  name,"
+      "  client_class,"
+      "  interface,"
+      "  modification_ts,"
+      "  preferred_lifetime,"
+      "  min_preferred_lifetime,"
+      "  max_preferred_lifetime,"
+      "  rapid_commit,"
+      "  rebind_timer,"
+      "  relay,"
+      "  renew_timer,"
+      "  require_client_classes,"
+      "  reservations_global,"
+      "  user_context,"
+      "  valid_lifetime,"
+      "  min_valid_lifetime,"
+      "  max_valid_lifetime,"
+      "  calculate_tee_times,"
+      "  t1_percent,"
+      "  t2_percent,"
+      "  interface_id,"
+      "  ddns_send_updates,"
+      "  ddns_override_no_update,"
+      "  ddns_override_client_update,"
+      "  ddns_replace_client_name,"
+      "  ddns_generated_prefix,"
+      "  ddns_qualifying_suffix,"
+      "  reservations_in_subnet,"
+      "  reservations_out_of_pool,"
+      "  cache_threshold,"
+      "  cache_max_age,"
+      "  allocator,"
+      "  pd_allocator"
+      ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?,"
+      " ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)" },
+
+    // Insert association of the shared network with a server.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_SHARED_NETWORK6_SERVER,
+      MYSQL_INSERT_SHARED_NETWORK_SERVER(dhcp6)
+    },
+
+    // Insert option definition.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6,
+      MYSQL_INSERT_OPTION_DEF(dhcp6)
+    },
+
+    // Insert option definition for client class.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6_CLIENT_CLASS,
+      MYSQL_INSERT_OPTION_DEF_CLIENT_CLASS(dhcp6)
+    },
+
+    // Insert association of the option definition with a server.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6_SERVER,
+      MYSQL_INSERT_OPTION_DEF_SERVER(dhcp6)
+    },
+
+    // Insert subnet specific option.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_OPTION6,
+      MYSQL_INSERT_OPTION6()
+    },
+
+    // Insert association of the DHCP option with a server.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_OPTION6_SERVER,
+      MYSQL_INSERT_OPTION_SERVER(dhcp6)
+    },
+
+    // Insert client class.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6,
+      "INSERT INTO dhcp6_client_class("
+      "  name,"
+      "  test,"
+      "  only_if_required,"
+      "  valid_lifetime,"
+      "  min_valid_lifetime,"
+      "  max_valid_lifetime,"
+      "  depend_on_known_directly,"
+      "  follow_class_name,"
+      "  preferred_lifetime,"
+      "  min_preferred_lifetime,"
+      "  max_preferred_lifetime,"
+      "  modification_ts, "
+      "  user_context "
+      ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
+    },
+
+    // Insert association of a client class with a server.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6_SERVER,
+      MYSQL_INSERT_CLIENT_CLASS_SERVER(dhcp6)
+    },
+
+    // Insert client class dependency.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6_DEPENDENCY,
+      MYSQL_INSERT_CLIENT_CLASS_DEPENDENCY(dhcp6)
+    },
+
+    // Insert server with server tag and description.
+    { MySqlConfigBackendDHCPv6Impl::INSERT_SERVER6,
+      MYSQL_INSERT_SERVER(dhcp6)
+    },
+
+    // Update existing global parameter.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_GLOBAL_PARAMETER6,
+      MYSQL_UPDATE_GLOBAL_PARAMETER(dhcp6)
+    },
+
+    // Update existing subnet.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_SUBNET6,
+      "UPDATE dhcp6_subnet SET"
+      "  subnet_id = ?,"
+      "  subnet_prefix = ?,"
+      "  client_class = ?,"
+      "  interface = ?,"
+      "  modification_ts = ?,"
+      "  preferred_lifetime = ?,"
+      "  min_preferred_lifetime = ?,"
+      "  max_preferred_lifetime = ?,"
+      "  rapid_commit = ?,"
+      "  rebind_timer = ?,"
+      "  relay = ?,"
+      "  renew_timer = ?,"
+      "  require_client_classes = ?,"
+      "  reservations_global = ?,"
+      "  shared_network_name = ?,"
+      "  user_context = ?,"
+      "  valid_lifetime = ?,"
+      "  min_valid_lifetime = ?,"
+      "  max_valid_lifetime = ?,"
+      "  calculate_tee_times = ?,"
+      "  t1_percent = ?,"
+      "  t2_percent = ?,"
+      "  interface_id = ?,"
+      "  ddns_send_updates = ?,"
+      "  ddns_override_no_update = ?,"
+      "  ddns_override_client_update = ?,"
+      "  ddns_replace_client_name = ?,"
+      "  ddns_generated_prefix = ?,"
+      "  ddns_qualifying_suffix = ?,"
+      "  reservations_in_subnet = ?,"
+      "  reservations_out_of_pool = ?,"
+      "  cache_threshold = ?,"
+      "  cache_max_age = ?,"
+      "  allocator = ?,"
+      "  pd_allocator = ? "
+      "WHERE subnet_id = ? OR subnet_prefix = ?" },
+
+    // Update existing shared network.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_SHARED_NETWORK6,
+      "UPDATE dhcp6_shared_network SET"
+      "  name = ?,"
+      "  client_class = ?,"
+      "  interface = ?,"
+      "  modification_ts = ?,"
+      "  preferred_lifetime = ?,"
+      "  min_preferred_lifetime = ?,"
+      "  max_preferred_lifetime = ?,"
+      "  rapid_commit = ?,"
+      "  rebind_timer = ?,"
+      "  relay = ?,"
+      "  renew_timer = ?,"
+      "  require_client_classes = ?,"
+      "  reservations_global = ?,"
+      "  user_context = ?,"
+      "  valid_lifetime = ?,"
+      "  min_valid_lifetime = ?,"
+      "  max_valid_lifetime = ?,"
+      "  calculate_tee_times = ?,"
+      "  t1_percent = ?,"
+      "  t2_percent = ?,"
+      "  interface_id = ?,"
+      "  ddns_send_updates = ?,"
+      "  ddns_override_no_update = ?,"
+      "  ddns_override_client_update = ?,"
+      "  ddns_replace_client_name = ?,"
+      "  ddns_generated_prefix = ?,"
+      "  ddns_qualifying_suffix = ?,"
+      "  reservations_in_subnet = ?,"
+      "  reservations_out_of_pool = ?,"
+      "  cache_threshold = ?,"
+      "  cache_max_age = ?,"
+      "  allocator = ?,"
+      "  pd_allocator = ? "
+      "WHERE name = ?" },
+
+    // Update existing option definition.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION_DEF6,
+      MYSQL_UPDATE_OPTION_DEF(dhcp6)
+    },
+
+    // Update existing client class option definition.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION_DEF6_CLIENT_CLASS,
+      MYSQL_UPDATE_OPTION_DEF_CLIENT_CLASS(dhcp6)
+    },
+
+    // Update existing global option.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION6,
+      MYSQL_UPDATE_OPTION6_WITH_TAG(AND o.scope_id = 0 AND o.code = ? AND o.space = ?)
+    },
+
+    // Update existing subnet level option.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_SUBNET_ID,
+      MYSQL_UPDATE_OPTION6_NO_TAG(o.scope_id = 1 AND o.dhcp6_subnet_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Update existing pool level option.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_POOL_ID,
+      MYSQL_UPDATE_OPTION6_NO_TAG(o.scope_id = 5 AND o.pool_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Update existing pd pool level option.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_PD_POOL_ID,
+      MYSQL_UPDATE_OPTION6_NO_TAG(o.scope_id = 6 AND o.pd_pool_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Update existing shared network level option.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_SHARED_NETWORK,
+      MYSQL_UPDATE_OPTION6_NO_TAG(o.scope_id = 4 AND o.shared_network_name = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Update existing client class level option.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_CLIENT_CLASS,
+      MYSQL_UPDATE_OPTION6_NO_TAG(o.scope_id = 2 AND o.dhcp_client_class = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Update existing client class with specifying its position.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_CLIENT_CLASS6,
+      MYSQL_UPDATE_CLIENT_CLASS6("follow_class_name = ?,")
+    },
+
+    // Update existing client class without specifying its position.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_CLIENT_CLASS6_SAME_POSITION,
+      MYSQL_UPDATE_CLIENT_CLASS6("")
+    },
+
+    // Update existing server, e.g. server description.
+    { MySqlConfigBackendDHCPv6Impl::UPDATE_SERVER6,
+      MYSQL_UPDATE_SERVER(dhcp6)
+    },
+
+    // Delete global parameter by name.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_GLOBAL_PARAMETER6,
+      MYSQL_DELETE_GLOBAL_PARAMETER(dhcp6, AND g.name = ?)
+    },
+
+    // Delete all global parameters.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_GLOBAL_PARAMETERS6,
+      MYSQL_DELETE_GLOBAL_PARAMETER(dhcp6)
+    },
+
+    // Delete all global parameters which are unassigned to any servers.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_GLOBAL_PARAMETERS6_UNASSIGNED,
+      MYSQL_DELETE_GLOBAL_PARAMETER_UNASSIGNED(dhcp6)
+    },
+
+    // Delete subnet by id with specifying server tag.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_ID_WITH_TAG,
+      MYSQL_DELETE_SUBNET_WITH_TAG(dhcp6, AND s.subnet_id = ?)
+    },
+
+    // Delete subnet by id without specifying server tag.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_ID_ANY,
+      MYSQL_DELETE_SUBNET_ANY(dhcp6, WHERE s.subnet_id = ?)
+    },
+
+    // Delete subnet by prefix with specifying server tag.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_PREFIX_WITH_TAG,
+      MYSQL_DELETE_SUBNET_WITH_TAG(dhcp6, AND s.subnet_prefix = ?)
+    },
+
+    // Delete subnet by prefix without specifying server tag.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_PREFIX_ANY,
+      MYSQL_DELETE_SUBNET_ANY(dhcp6, WHERE s.subnet_prefix = ?)
+    },
+
+    // Delete all subnets.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6,
+      MYSQL_DELETE_SUBNET_WITH_TAG(dhcp6)
+    },
+
+    // Delete all unassigned subnets.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6_UNASSIGNED,
+      MYSQL_DELETE_SUBNET_UNASSIGNED(dhcp6)
+    },
+
+    // Delete all subnets for a shared network.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6_SHARED_NETWORK_NAME,
+      MYSQL_DELETE_SUBNET_ANY(dhcp6, WHERE s.shared_network_name = ?)
+    },
+
+    // Delete associations of a subnet with server.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_SERVER,
+      MYSQL_DELETE_SUBNET_SERVER(dhcp6),
+    },
+
+    // Delete pools for a subnet.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_POOLS6,
+      MYSQL_DELETE_POOLS(dhcp6)
+    },
+
+    // Delete pd pools for a subnet.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_PD_POOLS,
+      MYSQL_DELETE_PD_POOLS()
+    },
+
+    // Delete shared network by name with specifying server tag.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_NAME_WITH_TAG,
+      MYSQL_DELETE_SHARED_NETWORK_WITH_TAG(dhcp6, AND n.name = ?)
+    },
+
+    // Delete shared network by name without specifying server tag.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_NAME_ANY,
+      MYSQL_DELETE_SHARED_NETWORK_ANY(dhcp6, WHERE n.name = ?)
+    },
+
+    // Delete all shared networks.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SHARED_NETWORKS6,
+      MYSQL_DELETE_SHARED_NETWORK_WITH_TAG(dhcp6)
+    },
+
+    // Delete all unassigned shared networks.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SHARED_NETWORKS6_UNASSIGNED,
+      MYSQL_DELETE_SHARED_NETWORK_UNASSIGNED(dhcp6)
+    },
+
+    // Delete associations of a shared network with server.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_SERVER,
+      MYSQL_DELETE_SHARED_NETWORK_SERVER(dhcp6)
+    },
+
+    // Delete option definition.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_OPTION_DEF6_CODE_NAME,
+      MYSQL_DELETE_OPTION_DEF(dhcp6, AND code = ? AND space = ?)
+    },
+
+    // Delete all option definitions.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_OPTION_DEFS6,
+      MYSQL_DELETE_OPTION_DEF(dhcp6)
+    },
+
+    // Delete all option definitions which are assigned to no servers.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_OPTION_DEFS6_UNASSIGNED,
+      MYSQL_DELETE_OPTION_DEF_UNASSIGNED(dhcp6)
+    },
+
+    // Delete client class specific option definitions.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_OPTION_DEFS6_CLIENT_CLASS,
+      MYSQL_DELETE_OPTION_DEFS_CLIENT_CLASS(dhcp6)
+    },
+
+    // Delete single global option.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_OPTION6,
+      MYSQL_DELETE_OPTION_WITH_TAG(dhcp6, AND o.scope_id = 0  AND o.code = ? AND o.space = ?)
+    },
+
+    // Delete all global options which are unassigned to any servers.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_GLOBAL_OPTIONS6_UNASSIGNED,
+      MYSQL_DELETE_OPTION_UNASSIGNED(dhcp6, AND o.scope_id = 0)
+    },
+
+    // Delete single option from a subnet.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_OPTION6_SUBNET_ID,
+      MYSQL_DELETE_OPTION_NO_TAG(dhcp6,
+                          WHERE o.scope_id = 1 AND o.dhcp6_subnet_id = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Delete single option from a pool.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_OPTION6_POOL_RANGE,
+      MYSQL_DELETE_OPTION_POOL_RANGE(dhcp6, o.scope_id = 5 AND o.code = ? AND o.space = ?)
+    },
+
+    // Delete single option from a pd pool.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_OPTION6_PD_POOL,
+      MYSQL_DELETE_OPTION_PD_POOL(o.scope_id = 6 AND o.code = ? AND o.space = ?)
+    },
+
+    // Delete single option from a shared network.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_OPTION6_SHARED_NETWORK,
+      MYSQL_DELETE_OPTION_NO_TAG(dhcp6,
+                          WHERE o.scope_id = 4 AND o.shared_network_name = ? AND o.code = ? AND o.space = ?)
+    },
+
+    // Delete options belonging to a subnet.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_OPTIONS6_SUBNET_ID_PREFIX,
+      MYSQL_DELETE_OPTION_SUBNET_ID_PREFIX(dhcp6)
+    },
+
+    // Delete options belonging to a shared_network.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_OPTIONS6_SHARED_NETWORK,
+      MYSQL_DELETE_OPTION_NO_TAG(dhcp6, WHERE o.scope_id = 4 AND o.shared_network_name = ?)
+    },
+
+    // Delete options belonging to a client class.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_OPTIONS6_CLIENT_CLASS,
+      MYSQL_DELETE_OPTION_NO_TAG(dhcp6, WHERE o.scope_id = 2 AND o.dhcp_client_class = ?)
+    },
+
+    // Delete all dependencies of a client class.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_DEPENDENCY,
+      MYSQL_DELETE_CLIENT_CLASS_DEPENDENCY(dhcp6)
+    },
+
+    // Delete associations of a client class with server.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_SERVER,
+      MYSQL_DELETE_CLIENT_CLASS_SERVER(dhcp6),
+    },
+
+    // Delete all client classes.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_CLIENT_CLASSES6,
+      MYSQL_DELETE_CLIENT_CLASS_WITH_TAG(dhcp6)
+    },
+
+    // Delete all unassigned client classes.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_CLIENT_CLASSES6_UNASSIGNED,
+      MYSQL_DELETE_CLIENT_CLASS_UNASSIGNED(dhcp6)
+    },
+
+    // Delete specified client class.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6,
+      MYSQL_DELETE_CLIENT_CLASS_WITH_TAG(dhcp6, AND name = ?)
+    },
+
+    // Delete any client class with a given name.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_ANY,
+      MYSQL_DELETE_CLIENT_CLASS_ANY(dhcp6, AND name = ?)
+    },
+
+    // Delete a server by tag.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_SERVER6,
+      MYSQL_DELETE_SERVER(dhcp6)
+    },
+
+    // Deletes all servers except logical server 'all'.
+    { MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SERVERS6,
+      MYSQL_DELETE_ALL_SERVERS(dhcp6)
+    }
+}
+};
+
+} // end anonymous namespace
+
+MySqlConfigBackendDHCPv6Impl::MySqlConfigBackendDHCPv6Impl(const DatabaseConnection::ParameterMap& parameters)
+    : MySqlConfigBackendImpl(parameters, &MySqlConfigBackendDHCPv6Impl::dbReconnect) {
+    // Prepare query statements. Those are will be only used to retrieve
+    // information from the database, so they can be used even if the
+    // database is read only for the current user.
+    conn_.prepareStatements(tagged_statements.begin(),
+                            tagged_statements.end());
+// @todo As part of enabling read-only CB access, statements need to
+// be limited:
+//                            tagged_statements.begin() + WRITE_STMTS_BEGIN);
+
+    // Create unique timer name per instance.
+    timer_name_ = "MySqlConfigBackend6[";
+    timer_name_ += boost::lexical_cast<std::string>(reinterpret_cast<uint64_t>(this));
+    timer_name_ += "]DbReconnectTimer";
+
+    // Create ReconnectCtl for this connection.
+    conn_.makeReconnectCtl(timer_name_);
+}
+
+MySqlConfigBackendDHCPv6Impl::~MySqlConfigBackendDHCPv6Impl() {
+}
+
+MySqlConfigBackendDHCPv6::MySqlConfigBackendDHCPv6(const DatabaseConnection::ParameterMap& parameters)
+    : impl_(new MySqlConfigBackendDHCPv6Impl(parameters)), base_impl_(impl_) {
+}
+
+bool
+MySqlConfigBackendDHCPv6::isUnusable() {
+    return (impl_->conn_.isUnusable());
+}
+
+DatabaseConnection::ParameterMap
+MySqlConfigBackendDHCPv6::getParameters() const {
+    return (impl_->getParameters());
+}
+
+Subnet6Ptr
+MySqlConfigBackendDHCPv6::getSubnet6(const ServerSelector& server_selector,
+                                     const std::string& subnet_prefix) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SUBNET6_BY_PREFIX)
+        .arg(subnet_prefix);
+    return (impl_->getSubnet6(server_selector, subnet_prefix));
+}
+
+Subnet6Ptr
+MySqlConfigBackendDHCPv6::getSubnet6(const ServerSelector& server_selector,
+                                     const SubnetID& subnet_id) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SUBNET6_BY_SUBNET_ID)
+        .arg(subnet_id);
+    return (impl_->getSubnet6(server_selector, subnet_id));
+}
+
+Subnet6Collection
+MySqlConfigBackendDHCPv6::getAllSubnets6(const ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SUBNETS6);
+    Subnet6Collection subnets;
+    impl_->getAllSubnets6(server_selector, subnets);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SUBNETS6_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+Subnet6Collection
+MySqlConfigBackendDHCPv6::getModifiedSubnets6(const ServerSelector& server_selector,
+                                              const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_SUBNETS6)
+        .arg(util::ptimeToText(modification_time));
+    Subnet6Collection subnets;
+    impl_->getModifiedSubnets6(server_selector, modification_time, subnets);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_SUBNETS6_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+Subnet6Collection
+MySqlConfigBackendDHCPv6::getSharedNetworkSubnets6(const ServerSelector& /* server_selector */,
+                                                   const std::string& shared_network_name) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6)
+        .arg(shared_network_name);
+    Subnet6Collection subnets;
+    impl_->getSharedNetworkSubnets6(ServerSelector::ANY(), shared_network_name, subnets);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+SharedNetwork6Ptr
+MySqlConfigBackendDHCPv6::getSharedNetwork6(const ServerSelector& server_selector,
+                                            const std::string& name) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SHARED_NETWORK6)
+        .arg(name);
+    return (impl_->getSharedNetwork6(server_selector, name));
+}
+
+SharedNetwork6Collection
+MySqlConfigBackendDHCPv6::getAllSharedNetworks6(const ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SHARED_NETWORKS6);
+    SharedNetwork6Collection shared_networks;
+    impl_->getAllSharedNetworks6(server_selector, shared_networks);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT)
+        .arg(shared_networks.size());
+    return (shared_networks);
+}
+
+SharedNetwork6Collection
+MySqlConfigBackendDHCPv6::getModifiedSharedNetworks6(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6)
+        .arg(util::ptimeToText(modification_time));
+    SharedNetwork6Collection shared_networks;
+    impl_->getModifiedSharedNetworks6(server_selector, modification_time, shared_networks);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT)
+        .arg(shared_networks.size());
+    return (shared_networks);
+}
+
+OptionDefinitionPtr
+MySqlConfigBackendDHCPv6::getOptionDef6(const ServerSelector& server_selector,
+                                        const uint16_t code,
+                                        const std::string& space) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_OPTION_DEF6)
+        .arg(code).arg(space);
+    return (impl_->getOptionDef(MySqlConfigBackendDHCPv6Impl::GET_OPTION_DEF6_CODE_SPACE,
+                                server_selector, code, space));
+}
+
+OptionDefContainer
+MySqlConfigBackendDHCPv6::getAllOptionDefs6(const ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_OPTION_DEFS6);
+    OptionDefContainer option_defs;
+    impl_->getAllOptionDefs(MySqlConfigBackendDHCPv6Impl::GET_ALL_OPTION_DEFS6,
+                            server_selector, option_defs);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_OPTION_DEFS6_RESULT)
+        .arg(option_defs.size());
+    return (option_defs);
+}
+
+OptionDefContainer
+MySqlConfigBackendDHCPv6::getModifiedOptionDefs6(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_OPTION_DEFS6)
+        .arg(util::ptimeToText(modification_time));
+    OptionDefContainer option_defs;
+    impl_->getModifiedOptionDefs(MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_OPTION_DEFS6,
+                                 server_selector, modification_time, option_defs);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT)
+        .arg(option_defs.size());
+    return (option_defs);
+}
+
+OptionDescriptorPtr
+MySqlConfigBackendDHCPv6::getOption6(const ServerSelector& server_selector,
+                                     const uint16_t code,
+                                     const std::string& space) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_OPTION6)
+        .arg(code).arg(space);
+    return (impl_->getOption(MySqlConfigBackendDHCPv6Impl::GET_OPTION6_CODE_SPACE,
+                             Option::V6, server_selector, code, space));
+}
+
+OptionContainer
+MySqlConfigBackendDHCPv6::getAllOptions6(const ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_OPTIONS6);
+    OptionContainer options = impl_->getAllOptions(MySqlConfigBackendDHCPv6Impl::GET_ALL_OPTIONS6,
+            Option::V6, server_selector);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_OPTIONS6_RESULT)
+        .arg(options.size());
+    return (options);
+}
+
+OptionContainer
+MySqlConfigBackendDHCPv6::getModifiedOptions6(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_OPTIONS6)
+        .arg(util::ptimeToText(modification_time));
+    OptionContainer options = impl_->getModifiedOptions(MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_OPTIONS6,
+            Option::V6, server_selector, modification_time);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_OPTIONS6_RESULT)
+        .arg(options.size());
+    return (options);
+}
+
+StampedValuePtr
+MySqlConfigBackendDHCPv6::getGlobalParameter6(const ServerSelector& server_selector,
+                                              const std::string& name) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_GLOBAL_PARAMETER6)
+        .arg(name);
+    return (impl_->getGlobalParameter6(server_selector, name));
+}
+
+StampedValueCollection
+MySqlConfigBackendDHCPv6::getAllGlobalParameters6(const ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6);
+    StampedValueCollection parameters;
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        MySqlBindingCollection in_bindings = { MySqlBinding::createString(tag.get()) };
+        impl_->getGlobalParameters(MySqlConfigBackendDHCPv6Impl::GET_ALL_GLOBAL_PARAMETERS6,
+                                   in_bindings, parameters);
+    }
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT)
+        .arg(parameters.size());
+    return (parameters);
+}
+
+StampedValueCollection
+MySqlConfigBackendDHCPv6::getModifiedGlobalParameters6(const db::ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6)
+        .arg(util::ptimeToText(modification_time));
+    StampedValueCollection parameters;
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(tag.get()),
+            MySqlBinding::createTimestamp(modification_time)
+        };
+        impl_->getGlobalParameters(MySqlConfigBackendDHCPv6Impl::GET_MODIFIED_GLOBAL_PARAMETERS6,
+                                   in_bindings, parameters);
+    }
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT)
+        .arg(parameters.size());
+    return (parameters);
+}
+
+ClientClassDefPtr
+MySqlConfigBackendDHCPv6::getClientClass6(const db::ServerSelector& server_selector,
+                                          const std::string& name) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_CLIENT_CLASS6)
+        .arg(name);
+    return (impl_->getClientClass6(server_selector, name));
+}
+
+ClientClassDictionary
+MySqlConfigBackendDHCPv6::getAllClientClasses6(const db::ServerSelector& server_selector) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_CLIENT_CLASSES6);
+    ClientClassDictionary client_classes;
+    impl_->getAllClientClasses6(server_selector, client_classes);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT)
+        .arg(client_classes.getClasses()->size());
+    return (client_classes);
+}
+
+ClientClassDictionary
+MySqlConfigBackendDHCPv6::getModifiedClientClasses6(const db::ServerSelector& server_selector,
+                                                    const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6)
+        .arg(util::ptimeToText(modification_time));
+    ClientClassDictionary client_classes;
+    impl_->getModifiedClientClasses6(server_selector, modification_time, client_classes);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT)
+        .arg(client_classes.getClasses()->size());
+    return (client_classes);
+}
+
+AuditEntryCollection
+MySqlConfigBackendDHCPv6::getRecentAuditEntries(const db::ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time,
+        const uint64_t& modification_id) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6)
+      .arg(util::ptimeToText(modification_time))
+      .arg(modification_id);
+    AuditEntryCollection audit_entries;
+    impl_->getRecentAuditEntries(MySqlConfigBackendDHCPv6Impl::GET_AUDIT_ENTRIES6_TIME,
+                                 server_selector, modification_time,
+                                 modification_id, audit_entries);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT)
+        .arg(audit_entries.size());
+    return (audit_entries);
+}
+
+ServerCollection
+MySqlConfigBackendDHCPv6::getAllServers6() const {
+    ServerCollection servers;
+
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SERVERS6);
+    impl_->getAllServers(MySqlConfigBackendDHCPv6Impl::GET_ALL_SERVERS6,
+                         servers);
+
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_ALL_SERVERS6_RESULT)
+        .arg(servers.size());
+    return (servers);
+}
+
+ServerPtr
+MySqlConfigBackendDHCPv6::getServer6(const data::ServerTag& server_tag) const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_SERVER6)
+        .arg(server_tag.get());
+    return (impl_->getServer(MySqlConfigBackendDHCPv6Impl::GET_SERVER6, server_tag));
+}
+
+void
+MySqlConfigBackendDHCPv6::createUpdateSubnet6(const ServerSelector& server_selector,
+                                              const Subnet6Ptr& subnet) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_SUBNET6)
+        .arg(subnet);
+    impl_->createUpdateSubnet6(server_selector, subnet);
+}
+
+void
+MySqlConfigBackendDHCPv6::createUpdateSharedNetwork6(const ServerSelector& server_selector,
+                                                     const SharedNetwork6Ptr& shared_network) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK6)
+        .arg(shared_network->getName());
+    impl_->createUpdateSharedNetwork6(server_selector, shared_network);
+}
+
+void
+MySqlConfigBackendDHCPv6::createUpdateOptionDef6(const ServerSelector& server_selector,
+                                                 const OptionDefinitionPtr& option_def) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_OPTION_DEF6)
+        .arg(option_def->getName()).arg(option_def->getCode());
+    impl_->createUpdateOptionDef6(server_selector, option_def);
+}
+
+void
+MySqlConfigBackendDHCPv6::createUpdateOption6(const ServerSelector& server_selector,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_OPTION6);
+    impl_->createUpdateOption6(server_selector, option);
+}
+
+void
+MySqlConfigBackendDHCPv6::createUpdateOption6(const db::ServerSelector& server_selector,
+                                              const std::string& shared_network_name,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6)
+        .arg(shared_network_name);
+    impl_->createUpdateOption6(server_selector, shared_network_name, option, false);
+}
+
+void
+MySqlConfigBackendDHCPv6::createUpdateOption6(const ServerSelector& server_selector,
+                                              const SubnetID& subnet_id,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6)
+        .arg(subnet_id);
+    impl_->createUpdateOption6(server_selector, subnet_id, option, false);
+}
+
+void
+MySqlConfigBackendDHCPv6::createUpdateOption6(const ServerSelector& server_selector,
+                                              const asiolink::IOAddress& pool_start_address,
+                                              const asiolink::IOAddress& pool_end_address,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6)
+        .arg(pool_start_address.toText()).arg(pool_end_address.toText());
+    impl_->createUpdateOption6(server_selector, pool_start_address, pool_end_address,
+                               option);
+}
+
+void
+MySqlConfigBackendDHCPv6::createUpdateOption6(const ServerSelector& server_selector,
+                                              const asiolink::IOAddress& pd_pool_prefix,
+                                              const uint8_t pd_pool_prefix_length,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6)
+        .arg(pd_pool_prefix.toText()).arg(pd_pool_prefix_length);
+    impl_->createUpdateOption6(server_selector, pd_pool_prefix,
+                               pd_pool_prefix_length, option);
+}
+
+void
+MySqlConfigBackendDHCPv6::createUpdateGlobalParameter6(const ServerSelector& server_selector,
+                                                       const StampedValuePtr& value) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6)
+        .arg(value->getName());
+    impl_->createUpdateGlobalParameter6(server_selector, value);
+}
+
+void
+MySqlConfigBackendDHCPv6::createUpdateClientClass6(const db::ServerSelector& server_selector,
+                                                   const ClientClassDefPtr& client_class,
+                                                   const std::string& follow_class_name) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS6)
+        .arg(client_class->getName());
+    impl_->createUpdateClientClass6(server_selector, client_class, follow_class_name);
+}
+
+void
+MySqlConfigBackendDHCPv6::createUpdateServer6(const ServerPtr& server) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_CREATE_UPDATE_SERVER6)
+        .arg(server->getServerTagAsText());
+    impl_->createUpdateServer(MySqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                              MySqlConfigBackendDHCPv6Impl::INSERT_SERVER6,
+                              MySqlConfigBackendDHCPv6Impl::UPDATE_SERVER6,
+                              server);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteSubnet6(const ServerSelector& server_selector,
+                                        const std::string& subnet_prefix) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_PREFIX_SUBNET6)
+        .arg(subnet_prefix);
+    uint64_t result = impl_->deleteSubnet6(server_selector, subnet_prefix);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteSubnet6(const ServerSelector& server_selector,
+                                        const SubnetID& subnet_id) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6)
+        .arg(subnet_id);
+    uint64_t result = impl_->deleteSubnet6(server_selector, subnet_id);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteAllSubnets6(const ServerSelector& server_selector) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SUBNETS6);
+
+    int index = (server_selector.amUnassigned() ?
+                 MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6_UNASSIGNED :
+                 MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all subnets",
+                                                 "deleted all subnets", true);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SUBNETS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteSharedNetworkSubnets6(const db::ServerSelector& server_selector,
+                                                      const std::string& shared_network_name) {
+    if (!server_selector.amAny()) {
+        isc_throw(InvalidOperation, "deleting all subnets from a shared "
+                  "network requires using ANY server selector");
+    }
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6)
+        .arg(shared_network_name);
+    uint64_t result = impl_->deleteTransactional(MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6_SHARED_NETWORK_NAME,
+                                                 server_selector,
+                                                 "deleting all subnets for a shared network",
+                                                 "deleted all subnets for a shared network",
+                                                 true, shared_network_name);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteSharedNetwork6(const ServerSelector& server_selector,
+                                               const std::string& name) {
+    /// @todo Using UNASSIGNED selector is allowed by the CB API but we don't have
+    /// dedicated query for this at the moment. The user should use ANY to delete
+    /// the shared network by name.
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "deleting an unassigned shared network requires "
+                  "an explicit server tag or using ANY server. The UNASSIGNED server "
+                  "selector is currently not supported");
+    }
+
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK6)
+        .arg(name);
+
+    int index = (server_selector.amAny() ?
+                 MySqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_NAME_ANY :
+                 MySqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_NAME_WITH_TAG);
+    uint64_t result = impl_->deleteTransactional(index, server_selector,
+                                                 "deleting a shared network",
+                                                 "shared network deleted", true, name);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteAllSharedNetworks6(const ServerSelector& server_selector) {
+    if (server_selector.amAny()) {
+        isc_throw(InvalidOperation, "deleting all shared networks for ANY server is not"
+                  " supported");
+    }
+
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6);
+
+    int index = (server_selector.amUnassigned() ?
+                 MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SHARED_NETWORKS6_UNASSIGNED :
+                 MySqlConfigBackendDHCPv6Impl::DELETE_ALL_SHARED_NETWORKS6);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all shared networks",
+                                                 "deleted all shared networks", true);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteOptionDef6(const ServerSelector& server_selector,
+                                           const uint16_t code,
+                                           const std::string& space) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_OPTION_DEF6)
+        .arg(code).arg(space);
+    uint64_t result = impl_->deleteOptionDef6(server_selector, code, space);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_OPTION_DEF6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteAllOptionDefs6(const ServerSelector& server_selector) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_OPTION_DEFS6);
+    uint64_t result = impl_->deleteTransactional(MySqlConfigBackendDHCPv6Impl::DELETE_ALL_OPTION_DEFS6,
+                                                 server_selector, "deleting all option definitions",
+                                                 "deleted all option definitions", true);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteOption6(const ServerSelector& server_selector,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_OPTION6)
+        .arg(code).arg(space);
+    uint64_t result = impl_->deleteOption6(server_selector, code, space);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_OPTION6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteOption6(const ServerSelector& /* server_selector */,
+                                        const std::string& shared_network_name,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6)
+        .arg(shared_network_name).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption6(ServerSelector::ANY(), shared_network_name,
+                                           code, space);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteOption6(const ServerSelector& /* server_selector */,
+                                        const SubnetID& subnet_id,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6)
+        .arg(subnet_id).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption6(ServerSelector::ANY(), subnet_id, code, space);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteOption6(const ServerSelector& /* server_selector */,
+                                        const asiolink::IOAddress& pool_start_address,
+                                        const asiolink::IOAddress& pool_end_address,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_POOL_OPTION6)
+        .arg(pool_start_address.toText()).arg(pool_end_address.toText()).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption6(ServerSelector::ANY(), pool_start_address,
+                                           pool_end_address, code, space);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_POOL_OPTION6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteOption6(const ServerSelector& /* server_selector */,
+                                        const asiolink::IOAddress& pd_pool_prefix,
+                                        const uint8_t pd_pool_prefix_length,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6)
+        .arg(pd_pool_prefix.toText()).arg(pd_pool_prefix_length).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption6(ServerSelector::ANY(), pd_pool_prefix,
+                                           pd_pool_prefix_length, code, space);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteGlobalParameter6(const ServerSelector& server_selector,
+                                                 const std::string& name) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_GLOBAL_PARAMETER6)
+        .arg(name);
+    uint64_t result = impl_->deleteTransactional(MySqlConfigBackendDHCPv6Impl::DELETE_GLOBAL_PARAMETER6,
+                                                 server_selector, "deleting global parameter",
+                                                 "global parameter deleted", false, name);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteAllGlobalParameters6(const ServerSelector& server_selector) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6);
+    uint64_t result = impl_->deleteTransactional(MySqlConfigBackendDHCPv6Impl::DELETE_ALL_GLOBAL_PARAMETERS6,
+                                                 server_selector, "deleting all global parameters",
+                                                 "all global parameters deleted", true);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteClientClass6(const db::ServerSelector& server_selector,
+                                             const std::string& name) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_CLIENT_CLASS6)
+        .arg(name);
+    auto result = impl_->deleteClientClass6(server_selector, name);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_CLIENT_CLASS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteAllClientClasses6(const db::ServerSelector& server_selector) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6);
+
+    int index = (server_selector.amUnassigned() ?
+                 MySqlConfigBackendDHCPv6Impl::DELETE_ALL_CLIENT_CLASSES6_UNASSIGNED :
+                 MySqlConfigBackendDHCPv6Impl::DELETE_ALL_CLIENT_CLASSES6);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all client classes",
+                                                 "deleted all client classes", true);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteServer6(const ServerTag& server_tag) {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SERVER6)
+        .arg(server_tag.get());
+    uint64_t result = impl_->deleteServer6(server_tag);
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SERVER6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+MySqlConfigBackendDHCPv6::deleteAllServers6() {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SERVERS6);
+    uint64_t result = impl_->deleteAllServers6();
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_ALL_SERVERS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+std::string
+MySqlConfigBackendDHCPv6::getType() const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_TYPE6);
+    return (impl_->getType());
+}
+
+std::string
+MySqlConfigBackendDHCPv6::getHost() const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_HOST6);
+    return (impl_->getHost());
+}
+
+uint16_t
+MySqlConfigBackendDHCPv6::getPort() const {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_GET_PORT6);
+    return (impl_->getPort());
+}
+
+bool
+MySqlConfigBackendDHCPv6::registerBackendType() {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_REGISTER_BACKEND_TYPE6);
+    return (
+        dhcp::ConfigBackendDHCPv6Mgr::instance().registerBackendFactory("mysql",
+            [](const db::DatabaseConnection::ParameterMap& params) -> dhcp::ConfigBackendDHCPv6Ptr {
+            return (dhcp::MySqlConfigBackendDHCPv6Ptr(new dhcp::MySqlConfigBackendDHCPv6(params)));
+        })
+    );
+}
+
+void
+MySqlConfigBackendDHCPv6::unregisterBackendType() {
+    LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_UNREGISTER_BACKEND_TYPE6);
+    dhcp::ConfigBackendDHCPv6Mgr::instance().unregisterBackendFactory("mysql");
+}
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp6.h b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp6.h
new file mode 100644
index 0000000..c829bf1
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp6.h
@@ -0,0 +1,664 @@
+// Copyright (C) 2019-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef MYSQL_CONFIG_BACKEND_DHCP6_H
+#define MYSQL_CONFIG_BACKEND_DHCP6_H
+
+#include <mysql_cb_impl.h>
+#include <database/database_connection.h>
+#include <dhcpsrv/client_class_def.h>
+#include <dhcpsrv/config_backend_dhcp6.h>
+#include <mysql_cb_log.h>
+#include <boost/shared_ptr.hpp>
+
+namespace isc {
+namespace dhcp {
+
+class MySqlConfigBackendDHCPv6Impl;
+
+/// @brief Implementation of the MySql Configuration Backend for
+/// Kea DHCPv6 server.
+///
+/// All POSIX times specified in the methods belonging to this
+/// class must be local times.
+///
+/// The server selection mechanisms used by this backend generally adhere
+/// to the rules described for @c ConfigBackendDHCPv6, but support for
+/// some of the selectors is not implemented. Whenever this is the case,
+/// the methods throw @c isc::NotImplemented exception.
+class MySqlConfigBackendDHCPv6 : public ConfigBackendDHCPv6 {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit MySqlConfigBackendDHCPv6(const db::DatabaseConnection::ParameterMap& parameters);
+
+    /// @brief Retrieves a single subnet by subnet_prefix.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be retrieved.
+    /// @return Pointer to the retrieved subnet or NULL if not found.
+    virtual Subnet6Ptr
+    getSubnet6(const db::ServerSelector& server_selector,
+               const std::string& subnet_prefix) const;
+
+    /// @brief Retrieves a single subnet by subnet identifier.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of a subnet to be retrieved.
+    /// @return Pointer to the retrieved subnet or NULL if not found.
+    virtual Subnet6Ptr
+    getSubnet6(const db::ServerSelector& server_selector, const SubnetID& subnet_id) const;
+
+    /// @brief Retrieves all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet6Collection
+    getAllSubnets6(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves subnets modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound subnet modification time.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet6Collection
+    getModifiedSubnets6(const db::ServerSelector& server_selector,
+                        const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves all subnets belonging to a specified shared network.
+    ///
+    /// The server selector is currently ignored by this method. All subnets
+    /// for the given shared network are returned regardless of their
+    /// associations with the servers.
+    ///
+    /// @param server_selector Server selector (currently ignored).
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be retrieved.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet6Collection
+    getSharedNetworkSubnets6(const db::ServerSelector& server_selector,
+                             const std::string& shared_network_name) const;
+
+    /// @brief Retrieves shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the shared network to be retrieved.
+    /// @return Pointer to the shared network or NULL if not found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual SharedNetwork6Ptr
+    getSharedNetwork6(const db::ServerSelector& server_selector,
+                      const std::string& name) const;
+
+    /// @brief Retrieves all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of shared network or empty collection if
+    /// no shared network found.
+    virtual SharedNetwork6Collection
+    getAllSharedNetworks6(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves shared networks modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound shared network modification time.
+    /// @return Collection of shared network or empty collection if
+    /// no shared network found.
+    virtual SharedNetwork6Collection
+    getModifiedSharedNetworks6(const db::ServerSelector& server_selector,
+                               const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves single option definition by code and space.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be retrieved.
+    /// @param space Option space of the option to be retrieved.
+    /// @return Pointer to the option definition or NULL if not found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual OptionDefinitionPtr
+    getOptionDef6(const db::ServerSelector& server_selector, const uint16_t code,
+                  const std::string& space) const;
+
+    /// @brief Retrieves all option definitions.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of option definitions or empty collection if
+    /// no option definition found.
+    virtual OptionDefContainer
+    getAllOptionDefs6(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves option definitions modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound option definition modification
+    /// time.
+    /// @return Collection of option definitions or empty collection if
+    /// no option definition found.
+    virtual OptionDefContainer
+    getModifiedOptionDefs6(const db::ServerSelector& server_selector,
+                           const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves single option by code and space.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Pointer to the retrieved option descriptor or null if
+    /// no option was found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual OptionDescriptorPtr
+    getOption6(const db::ServerSelector& server_selector, const uint16_t code,
+               const std::string& space) const;
+
+    /// @brief Retrieves all global options.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of global options or empty collection if no
+    /// option found.
+    virtual OptionContainer
+    getAllOptions6(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves option modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound option modification time.
+    /// @return Collection of global options or empty collection if no
+    /// option found.
+    virtual OptionContainer
+    getModifiedOptions6(const db::ServerSelector& server_selector,
+                        const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves global parameter value.
+    ///
+    /// Typically, the server selector used for this query should be set to
+    /// ONE. It is possible to use the MULTIPLE server selector but in that
+    /// case only the first found parameter is returned.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter to be retrieved.
+    /// @return Value of the global parameter.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual data::StampedValuePtr
+    getGlobalParameter6(const db::ServerSelector& server_selector,
+                        const std::string& name) const;
+
+    /// @brief Retrieves all global parameters.
+    ///
+    /// Using the server selector it is possible to fetch the parameters for
+    /// one or more servers. The following list describes what parameters are
+    /// returned depending on the server selector specified:
+    /// - ALL: only common parameters are returned which are associated with
+    ///   the logical server 'all'. No parameters associated with the explicit
+    ///   server tags are returned.
+    ///
+    /// - ONE: parameters used by the particular sever are returned. This includes
+    ///   parameters associated with the particular server (identified by tag)
+    ///   and parameters associated with the logical server 'all' when server
+    ///   specific parameters are not given. For example, if there is a
+    ///   renew-timer specified for 'server1' tag, different value of the
+    ///   renew-timer specified for 'all' servers and a rebind-timer specified
+    ///   for 'all' servers, the caller will receive renew-timer value associated
+    ///   with the server1 and the rebind-timer value associated with all servers,
+    ///   because there is no explicit rebind-timer specified for server1.
+    ///
+    /// - MULTIPLE: parameters used by multiple servers, but those associated
+    ///   with specific server tags take precedence over the values specified for
+    ///   'all' servers. This is similar to the case of ONE server described
+    ///   above. The effect of querying for parameters belonging to multiple
+    ///   servers is the same as issuing multiple queries with ONE server
+    ///   being selected multiple times.
+    ///
+    /// - UNASSIGNED: parameters not associated with any servers.
+    ///
+    ///
+    /// @param server_selector Server selector.
+    virtual data::StampedValueCollection
+    getAllGlobalParameters6(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves global parameters modified after specified time.
+    ///
+    /// @param modification_time Lower bound modification time.
+    /// @return Collection of modified global parameters.
+    virtual data::StampedValueCollection
+    getModifiedGlobalParameters6(const db::ServerSelector& server_selector,
+                                 const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves a client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Client class name.
+    /// @return Pointer to the retrieved client class.
+    virtual ClientClassDefPtr
+    getClientClass6(const db::ServerSelector& selector, const std::string& name) const;
+
+    /// @brief Retrieves all client classes.
+    ///
+    /// @param selector Server selector.
+    /// @return Collection of client classes.
+    virtual ClientClassDictionary
+    getAllClientClasses6(const db::ServerSelector& selector) const;
+
+    /// @brief Retrieves client classes modified after specified time.
+    ///
+    /// @param selector Server selector.
+    /// @param modification_time Modification time.
+    /// @return Collection of client classes.
+    virtual ClientClassDictionary
+    getModifiedClientClasses6(const db::ServerSelector& selector,
+                              const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves the most recent audit entries.
+    ///
+    /// @param selector Server selector.
+    /// @param modification_time Timestamp being a lower limit for the returned
+    /// result set, i.e. entries later than specified time are returned.
+    /// @param modification_id Identifier being a lower limit for the returned
+    /// result set, used when two (or more) entries have the same
+    /// modification_time.
+    /// @return Collection of audit entries.
+    virtual db::AuditEntryCollection
+    getRecentAuditEntries(const db::ServerSelector& server_selector,
+                          const boost::posix_time::ptime& modification_time,
+                          const uint64_t& modification_id) const;
+
+    /// @brief Retrieves all servers.
+    ///
+    /// This method returns the list of servers excluding the logical server
+    /// 'all'.
+    ///
+    /// @return Collection of servers from the backend.
+    virtual db::ServerCollection
+    getAllServers6() const;
+
+    /// @brief Retrieves a server.
+    ///
+    /// @param server_tag Tag of the server to be retrieved.
+    /// @return Pointer to the server instance or null pointer if no server
+    /// with the particular tag was found.
+    virtual db::ServerPtr
+    getServer6(const data::ServerTag& server_tag) const;
+
+    /// @brief Creates or updates a subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Subnet to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateSubnet6(const db::ServerSelector& server_selector,
+                        const Subnet6Ptr& subnet);
+
+    /// @brief Creates or updates a shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network Shared network to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateSharedNetwork6(const db::ServerSelector& server_selector,
+                               const SharedNetwork6Ptr& shared_network);
+
+    /// @brief Creates or updates an option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Option definition to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOptionDef6(const db::ServerSelector& server_selector,
+                           const OptionDefinitionPtr& option_def);
+
+    /// @brief Creates or updates global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption6(const db::ServerSelector& server_selector,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of a shared network to which option
+    /// belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption6(const db::ServerSelector& server_selector,
+                        const std::string& shared_network_name,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of a subnet to which option belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption6(const db::ServerSelector& server_selector,
+                        const SubnetID& subnet_id,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool to which
+    /// the option belongs.
+    /// @param pool_end_address Upper bound address of the pool to which the
+    /// option belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption6(const db::ServerSelector& server_selector,
+                        const asiolink::IOAddress& pool_start_address,
+                        const asiolink::IOAddress& pool_end_address,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates prefix delegation pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pd_pool_prefix Address part of the prefix of the prefix
+    /// delegation pool to which the option belongs.
+    /// @param pd_pool_prefix_length Prefix length of the prefix
+    /// delegation pool to which the option belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption6(const db::ServerSelector& server_selector,
+                        const asiolink::IOAddress& pd_pool_prefix,
+                        const uint8_t pd_pool_prefix_length,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter.
+    /// @param value Value of the global parameter.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateGlobalParameter6(const db::ServerSelector& server_selector,
+                                 const data::StampedValuePtr& value);
+
+    /// @brief Creates or updates DHCPv6 client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Client class to be added or updated.
+    /// @param follow_class_name name of the class after which the
+    /// new or updated class should be positioned. An empty value
+    /// causes the class to be appended at the end of the class
+    /// hierarchy.
+    virtual void
+    createUpdateClientClass6(const db::ServerSelector& server_selector,
+                             const ClientClassDefPtr& client_class,
+                             const std::string& follow_class_name);
+
+    /// @brief Creates or updates a server.
+    ///
+    /// @param server Instance of the server to be stored.
+    /// @throw InvalidOperation when trying to create a duplicate or
+    /// update the logical server 'all'.
+    virtual void
+    createUpdateServer6(const db::ServerPtr& server);
+
+    /// @brief Deletes subnet by prefix.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSubnet6(const db::ServerSelector& server_selector,
+                  const std::string& subnet_prefix);
+
+    /// @brief Deletes subnet by identifier.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSubnet6(const db::ServerSelector& server_selector, const SubnetID& subnet_id);
+
+    /// @brief Deletes all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllSubnets6(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes all subnets belonging to a specified shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be deleted.
+    /// @return Number of deleted subnets.
+    virtual uint64_t
+    deleteSharedNetworkSubnets6(const db::ServerSelector& server_selector,
+                                const std::string& shared_network_name);
+
+    /// @brief Deletes shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the shared network to be deleted.
+    /// @return Number of deleted shared networks.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSharedNetwork6(const db::ServerSelector& server_selector,
+                         const std::string& name);
+
+    /// @brief Deletes all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted shared networks.
+    virtual uint64_t
+    deleteAllSharedNetworks6(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be deleted.
+    /// @param space Option space of the option to be deleted.
+    /// @return Number of deleted option definitions.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOptionDef6(const db::ServerSelector& server_selector, const uint16_t code,
+                     const std::string& space);
+
+    /// @brief Deletes all option definitions.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted option definitions.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllOptionDefs6(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be deleted.
+    /// @param space Option space of the option to be deleted.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption6(const db::ServerSelector& server_selector, const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network which deleted
+    /// option belongs to
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption6(const db::ServerSelector& server_selector,
+                  const std::string& shared_network_name,
+                  const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to which deleted option
+    /// belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption6(const db::ServerSelector& server_selector, const SubnetID& subnet_id,
+                  const uint16_t code, const std::string& space);
+
+    /// @brief Deletes pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool to which
+    /// deleted option belongs.
+    /// @param pool_end_address Upper bound address of the pool to which the
+    /// deleted option belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption6(const db::ServerSelector& server_selector,
+                  const asiolink::IOAddress& pool_start_address,
+                  const asiolink::IOAddress& pool_end_address,
+                  const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes prefix delegation pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the prefix
+    /// delegation pool to which deleted option belongs.
+    /// @param pool_end_address Upper bound address of the prefix
+    /// delegation pool to which the deleted option belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption6(const db::ServerSelector& server_selector,
+                  const asiolink::IOAddress& pd_pool_prefix,
+                  const uint8_t pd_pool_prefix_length,
+                  const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter to be deleted.
+    /// @return Number of deleted global parameters.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteGlobalParameter6(const db::ServerSelector& server_selector,
+                           const std::string& name);
+
+    /// @brief Deletes all global parameters.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted global parameters.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllGlobalParameters6(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes DHCPv6 client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the class to be deleted.
+    /// @return Number of deleted client classes.
+    virtual uint64_t
+    deleteClientClass6(const db::ServerSelector& server_selector,
+                       const std::string& name);
+
+    /// @brief Deletes all client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted client classes.
+    virtual uint64_t
+    deleteAllClientClasses6(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes a server from the backend.
+    ///
+    /// @param server_tag Tag of the server to be deleted.
+    /// @return Number of deleted servers.
+    /// @throw isc::InvalidOperation when trying to delete the logical
+    /// server 'all'.
+    virtual uint64_t
+    deleteServer6(const data::ServerTag& server_tag);
+
+    /// @brief Deletes all servers from the backend except the logical
+    /// server 'all'.
+    ///
+    /// @return Number of deleted servers.
+    virtual uint64_t
+    deleteAllServers6();
+
+    /// @brief Returns backend type in the textual format.
+    ///
+    /// @return "mysql".
+    virtual std::string getType() const;
+
+    /// @brief Returns backend host.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return host on which the database is located.
+    virtual std::string getHost() const;
+
+    /// @brief Returns backend port number.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return Port number on which database service is available.
+    virtual uint16_t getPort() const;
+
+    /// @brief Registers the MySQL backend factory with backend config manager
+    ///
+    /// This should be called by the hook lib load() function.
+    /// @return True if the factory was registered successfully, false otherwise.
+    static bool registerBackendType();
+
+    /// @brief Unregisters the MySQL backend factory and discards MySQL backends
+    ///
+    /// This should be called by the hook lib unload() function.
+    static void unregisterBackendType();
+
+    /// @brief Flag which indicates if the config backend has an unusable
+    /// connection.
+    ///
+    /// @return true if there is at least one unusable connection, false
+    /// otherwise
+    virtual bool isUnusable();
+
+    /// @brief Return backend parameters
+    ///
+    /// Returns the backend parameters
+    ///
+    /// @return Parameters of the backend.
+    isc::db::DatabaseConnection::ParameterMap getParameters() const;
+
+protected:
+
+    /// @brief Pointer to the implementation of the @c MySqlConfigBackendDHCPv6
+    /// class.
+    boost::shared_ptr<MySqlConfigBackendDHCPv6Impl> impl_;
+
+    /// @brief Pointer to the base implementation of the backend shared by
+    /// DHCPv4 and DHCPv6 servers.
+    boost::shared_ptr<MySqlConfigBackendImpl> base_impl_;
+};
+
+/// @brief Pointer to the @c MySqlConfigBackendDHCPv6 class.
+typedef boost::shared_ptr<MySqlConfigBackendDHCPv6> MySqlConfigBackendDHCPv6Ptr;
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif // MYSQL_CONFIG_BACKEND_DHCP6_H
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_impl.cc b/src/hooks/dhcp/mysql_cb/mysql_cb_impl.cc
new file mode 100644
index 0000000..679fe20
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_impl.cc
@@ -0,0 +1,1110 @@
+// Copyright (C) 2018-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <mysql_cb_impl.h>
+#include <mysql_cb_log.h>
+#include <asiolink/io_address.h>
+#include <config_backend/constants.h>
+#include <dhcp/option_space.h>
+#include <util/buffer.h>
+
+#include <mysql.h>
+#include <mysqld_error.h>
+#include <cstdint>
+#include <utility>
+
+using namespace isc::asiolink;
+using namespace isc::cb;
+using namespace isc::data;
+using namespace isc::db;
+using namespace isc::log;
+using namespace isc::util;
+
+namespace isc {
+namespace dhcp {
+
+isc::asiolink::IOServicePtr MySqlConfigBackendImpl::io_service_ = isc::asiolink::IOServicePtr();
+
+MySqlConfigBackendImpl::
+ScopedAuditRevision::ScopedAuditRevision(MySqlConfigBackendImpl* impl,
+                                         const int index,
+                                         const ServerSelector& server_selector,
+                                         const std::string& log_message,
+                                         bool cascade_transaction)
+    : impl_(impl) {
+    impl_->createAuditRevision(index, server_selector,
+                               boost::posix_time::microsec_clock::local_time(),
+                               log_message,
+                               cascade_transaction);
+}
+
+MySqlConfigBackendImpl::
+ScopedAuditRevision::~ScopedAuditRevision() {
+    impl_->clearAuditRevision();
+}
+
+MySqlConfigBackendImpl::
+MySqlConfigBackendImpl(const DatabaseConnection::ParameterMap& parameters,
+                       const DbCallback db_reconnect_callback)
+    : conn_(parameters,
+            IOServiceAccessorPtr(new IOServiceAccessor(MySqlConfigBackendImpl::getIOService)),
+            db_reconnect_callback), timer_name_(""),
+      audit_revision_ref_count_(0), parameters_(parameters) {
+    // Test schema version first.
+    std::pair<uint32_t, uint32_t> code_version(MYSQL_SCHEMA_VERSION_MAJOR,
+                                               MYSQL_SCHEMA_VERSION_MINOR);
+    std::pair<uint32_t, uint32_t> db_version =
+        MySqlConnection::getVersion(parameters);
+    if (code_version != db_version) {
+        isc_throw(DbOpenError, "MySQL schema version mismatch: need version: "
+                  << code_version.first << "." << code_version.second
+                  << " found version: " << db_version.first << "."
+                  << db_version.second);
+    }
+
+    // Open the database.
+    conn_.openDatabase();
+
+    // Check if we have TLS when we required it.
+    if (conn_.getTls()) {
+        std::string cipher = conn_.getTlsCipher();
+        if (cipher.empty()) {
+            LOG_ERROR(mysql_cb_logger, MYSQL_CB_NO_TLS);
+        } else {
+            LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC,
+                      MYSQL_CB_TLS_CIPHER)
+                .arg(cipher);
+        }
+    }
+}
+
+MySqlConfigBackendImpl::~MySqlConfigBackendImpl() {
+    // Free up the prepared statements, ignoring errors. (What would we do
+    // about them? We're destroying this object and are not really concerned
+    // with errors on a database connection that is about to go away.)
+    for (int i = 0; i < conn_.statements_.size(); ++i) {
+        if (conn_.statements_[i] != NULL) {
+            (void) mysql_stmt_close(conn_.statements_[i]);
+            conn_.statements_[i] = NULL;
+        }
+    }
+}
+
+MySqlBindingPtr
+MySqlConfigBackendImpl::createBinding(const Triplet<uint32_t>& triplet) {
+    if (triplet.unspecified()) {
+        return (MySqlBinding::createNull());
+    }
+    return (MySqlBinding::createInteger<uint32_t>(triplet.get()));
+}
+
+MySqlBindingPtr
+MySqlConfigBackendImpl::createMinBinding(const Triplet<uint32_t>& triplet) {
+    if (triplet.unspecified() || (triplet.getMin() == triplet.get())) {
+        return (MySqlBinding::createNull());
+    }
+    return (MySqlBinding::createInteger<uint32_t>(triplet.getMin()));
+}
+
+MySqlBindingPtr
+MySqlConfigBackendImpl::createMaxBinding(const Triplet<uint32_t>& triplet) {
+    if (triplet.unspecified() || (triplet.getMax() == triplet.get())) {
+        return (MySqlBinding::createNull());
+    }
+    return (MySqlBinding::createInteger<uint32_t>(triplet.getMax()));
+}
+
+Triplet<uint32_t>
+MySqlConfigBackendImpl::createTriplet(const MySqlBindingPtr& binding) {
+    if (!binding) {
+        isc_throw(Unexpected, "MySQL configuration backend internal error: "
+                  "binding pointer is NULL when creating a triplet value");
+    }
+
+    if (binding->amNull()) {
+        return (Triplet<uint32_t>());
+    }
+
+    return (Triplet<uint32_t>(binding->getInteger<uint32_t>()));
+}
+
+Triplet<uint32_t>
+MySqlConfigBackendImpl::createTriplet(const MySqlBindingPtr& def_binding,
+                                      const MySqlBindingPtr& min_binding,
+                                      const MySqlBindingPtr& max_binding) {
+    if (!def_binding || !min_binding || !max_binding) {
+        isc_throw(Unexpected, "MySQL configuration backend internal error: "
+                  "binding pointer is NULL when creating a triplet value");
+    }
+
+    // This code assumes the database was filled using the API, e.g. it
+    // is not possible (so not handled) to have only the min_binding not NULL.
+    if (def_binding->amNull()) {
+        return (Triplet<uint32_t>());
+    }
+
+    uint32_t value = def_binding->getInteger<uint32_t>();
+    uint32_t min_value = value;
+    if (!min_binding->amNull()) {
+        min_value = min_binding->getInteger<uint32_t>();
+    }
+    uint32_t max_value = value;
+    if (!max_binding->amNull()) {
+        max_value = max_binding->getInteger<uint32_t>();
+    }
+
+    return (Triplet<uint32_t>(min_value, value, max_value));
+}
+
+void
+MySqlConfigBackendImpl::createAuditRevision(const int index,
+                                            const ServerSelector& server_selector,
+                                            const boost::posix_time::ptime& audit_ts,
+                                            const std::string& log_message,
+                                            const bool cascade_transaction) {
+    // Do not touch existing audit revision in case of the cascade update.
+    if (++audit_revision_ref_count_ > 1) {
+        return;
+    }
+
+    /// @todo The audit trail is not really well prepared to handle multiple server
+    /// tags or no server tags. Therefore, if the server selector appears to be
+    /// pointing to multiple servers, no servers or any server we simply associate the
+    /// audit revision with all servers. The only case when we create a dedicated
+    /// audit entry is when there is a single server tag, i.e. "all" or explicit
+    /// server name. In fact, these are the most common two cases.
+    std::string tag = ServerTag::ALL;
+    auto const& tags = server_selector.getTags();
+    if (tags.size() == 1) {
+        tag = tags.begin()->get();
+    }
+
+    MySqlBindingCollection in_bindings = {
+        MySqlBinding::createTimestamp(audit_ts),
+        MySqlBinding::createString(tag),
+        MySqlBinding::createString(log_message),
+        MySqlBinding::createInteger<uint8_t>(static_cast<uint8_t>(cascade_transaction))
+    };
+    conn_.insertQuery(index, in_bindings);
+}
+
+void
+MySqlConfigBackendImpl::clearAuditRevision() {
+    if (audit_revision_ref_count_ <= 0) {
+        isc_throw(Unexpected, "attempted to clear audit revision that does not exist - coding error");
+    }
+    --audit_revision_ref_count_;
+}
+
+void
+MySqlConfigBackendImpl::getRecentAuditEntries(const int index,
+                                              const db::ServerSelector& server_selector,
+                                              const boost::posix_time::ptime& modification_time,
+                                              const uint64_t& modification_id,
+                                              AuditEntryCollection& audit_entries) {
+    // Create the output bindings for receiving the data.
+    MySqlBindingCollection out_bindings = {
+        MySqlBinding::createInteger<uint64_t>(), // id
+        MySqlBinding::createString(AUDIT_ENTRY_OBJECT_TYPE_BUF_LENGTH), // object_type
+        MySqlBinding::createInteger<uint64_t>(), // object_id
+        MySqlBinding::createInteger<uint8_t>(), // modification_type
+        MySqlBinding::createTimestamp(), // modification_time
+        MySqlBinding::createInteger<uint64_t>(), // revision_id
+        MySqlBinding::createString(AUDIT_ENTRY_LOG_MESSAGE_BUF_LENGTH) // log_message
+    };
+
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+
+        // There are only a few input bindings
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(tag.get()),
+            MySqlBinding::createTimestamp(modification_time),
+            MySqlBinding::createInteger<uint64_t>(modification_id)
+        };
+
+        // Execute select.
+        conn_.selectQuery(index, in_bindings, out_bindings,
+                          [&audit_entries] (MySqlBindingCollection& out_bindings) {
+             // Convert the numeric modification type into modification type enum.
+            AuditEntry::ModificationType mod_type =
+                static_cast<AuditEntry::ModificationType>(out_bindings[3]->getInteger<uint8_t>());
+
+            // Create new audit entry and add it to the collection of received
+            // entries.
+            AuditEntryPtr audit_entry =
+                AuditEntry::create(out_bindings[1]->getString(),
+                                   out_bindings[2]->getInteger<uint64_t>(),
+                                   mod_type,
+                                   out_bindings[4]->getTimestamp(),
+                                   out_bindings[5]->getInteger<uint64_t>(),
+                                   out_bindings[6]->getStringOrDefault(""));
+            audit_entries.insert(audit_entry);
+        });
+    }
+}
+
+uint64_t
+MySqlConfigBackendImpl::deleteFromTable(const int index,
+                                        const ServerSelector& server_selector,
+                                        const std::string& operation) {
+    // When deleting multiple objects we must not use ANY server.
+    if (server_selector.amAny()) {
+        isc_throw(InvalidOperation, "deleting multiple objects for ANY server is not"
+                                    " supported");
+    }
+
+    MySqlBindingCollection in_bindings;
+    return (deleteFromTable(index, server_selector, operation, in_bindings));
+}
+
+void
+MySqlConfigBackendImpl::getGlobalParameters(const int index,
+                                            const MySqlBindingCollection& in_bindings,
+                                            StampedValueCollection& parameters) {
+    // The following parameters from the dhcp[46]_global_parameter table are
+    // returned:
+    // - id
+    // - name - parameter name
+    // - value - parameter value
+    // - modification_ts - modification timestamp.
+    MySqlBindingCollection out_bindings = {
+        MySqlBinding::createInteger<uint64_t>(), // id
+        MySqlBinding::createString(GLOBAL_PARAMETER_NAME_BUF_LENGTH), // name
+        MySqlBinding::createString(GLOBAL_PARAMETER_VALUE_BUF_LENGTH), // value
+        MySqlBinding::createInteger<uint8_t>(), // parameter_type
+        MySqlBinding::createTimestamp(), // modification_ts
+        MySqlBinding::createString(SERVER_TAG_BUF_LENGTH) // server_tag
+    };
+
+    StampedValuePtr last_param;
+
+    StampedValueCollection local_parameters;
+
+    conn_.selectQuery(index, in_bindings, out_bindings,
+                      [&last_param, &local_parameters]
+                      (MySqlBindingCollection& out_bindings) {
+
+        uint64_t id = out_bindings[0]->getInteger<uint64_t>();
+
+        // If we're starting or if this is new parameter being processed...
+        if (!last_param || (last_param->getId() != id)) {
+
+            // parameter name
+            std::string name = out_bindings[1]->getString();
+
+            if (!name.empty()) {
+                last_param = StampedValue::create(name,
+                                                  out_bindings[2]->getString(),
+                                                  static_cast<Element::types>
+                                                  (out_bindings[3]->getInteger<uint8_t>()));
+
+                // id
+                last_param->setId(id);
+
+                // modification_ts
+                last_param->setModificationTime(out_bindings[4]->getTimestamp());
+
+                // server_tag
+                ServerTag last_param_server_tag(out_bindings[5]->getString());
+                last_param->setServerTag(last_param_server_tag.get());
+
+                // If we're fetching parameters for a given server (explicit server
+                // tag is provided), it takes precedence over the same parameter
+                // specified for all servers. Therefore, we check if the given
+                // parameter already exists and belongs to 'all'.
+                auto& index = local_parameters.get<StampedValueNameIndexTag>();
+                auto existing = index.find(name);
+                if (existing != index.end()) {
+                    // This parameter was already fetched. Let's check if we should
+                    // replace it or not.
+                    if (!last_param_server_tag.amAll() && (*existing)->hasAllServerTag()) {
+                        // Replace parameter specified for 'all' with the one associated
+                        // with the particular server tag.
+                        local_parameters.replace(existing, last_param);
+                        return;
+                    }
+
+                }
+
+                // If there is no such parameter yet or the existing parameter
+                // belongs to a different server and the inserted parameter is
+                // not for all servers.
+                if ((existing == index.end()) ||
+                    (!(*existing)->hasServerTag(last_param_server_tag) &&
+                     !last_param_server_tag.amAll())) {
+                    local_parameters.insert(last_param);
+                }
+            }
+        }
+    });
+
+    parameters.insert(local_parameters.begin(), local_parameters.end());
+}
+
+OptionDefinitionPtr
+MySqlConfigBackendImpl::getOptionDef(const int index,
+                                     const ServerSelector& server_selector,
+                                     const uint16_t code,
+                                     const std::string& space) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                  " (unassigned) is unsupported at the moment");
+    }
+
+    auto tag = getServerTag(server_selector, "fetching option definition");
+
+    OptionDefContainer option_defs;
+    MySqlBindingCollection in_bindings = {
+        MySqlBinding::createString(tag),
+        MySqlBinding::createInteger<uint16_t>(code),
+        MySqlBinding::createString(space)
+    };
+    getOptionDefs(index, in_bindings, option_defs);
+    return (option_defs.empty() ? OptionDefinitionPtr() : *option_defs.begin());
+}
+
+void
+MySqlConfigBackendImpl::getAllOptionDefs(const int index,
+                                         const ServerSelector& server_selector,
+                                         OptionDefContainer& option_defs) {
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(tag.get())
+        };
+        getOptionDefs(index, in_bindings, option_defs);
+    }
+}
+
+void
+MySqlConfigBackendImpl::getModifiedOptionDefs(const int index,
+                                              const ServerSelector& server_selector,
+                                              const boost::posix_time::ptime& modification_time,
+                                              OptionDefContainer& option_defs) {
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(tag.get()),
+            MySqlBinding::createTimestamp(modification_time)
+        };
+        getOptionDefs(index, in_bindings, option_defs);
+    }
+}
+
+void
+MySqlConfigBackendImpl::getOptionDefs(const int index,
+                                      const MySqlBindingCollection& in_bindings,
+                                      OptionDefContainer& option_defs) {
+    // Create output bindings. The order must match that in the prepared
+    // statement.
+    MySqlBindingCollection out_bindings = {
+        MySqlBinding::createInteger<uint64_t>(), // id
+        MySqlBinding::createInteger<uint16_t>(), // code
+        MySqlBinding::createString(OPTION_NAME_BUF_LENGTH), // name
+        MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH), // space
+        MySqlBinding::createInteger<uint8_t>(), // type
+        MySqlBinding::createTimestamp(), // modification_ts
+        MySqlBinding::createInteger<uint8_t>(), // array
+        MySqlBinding::createString(OPTION_ENCAPSULATE_BUF_LENGTH), // encapsulate
+        MySqlBinding::createString(OPTION_RECORD_TYPES_BUF_LENGTH), // record_types
+        MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH), // user_context
+        MySqlBinding::createString(SERVER_TAG_BUF_LENGTH) // server_tag
+    };
+
+    uint64_t last_def_id = 0;
+
+    OptionDefContainer local_option_defs;
+
+    // Run select query.
+    conn_.selectQuery(index, in_bindings, out_bindings,
+                      [this, &local_option_defs, &last_def_id]
+                      (MySqlBindingCollection& out_bindings) {
+        // Get pointer to last fetched option definition.
+        OptionDefinitionPtr last_def;
+        if (!local_option_defs.empty()) {
+            last_def = *local_option_defs.rbegin();
+        }
+
+        // See if the last fetched definition is the one for which we now got
+        // the row of data. If not, it means that we need to create new option
+        // definition.
+        if ((last_def_id == 0) ||
+            (last_def_id != out_bindings[0]->getInteger<uint64_t>())) {
+
+            last_def_id = out_bindings[0]->getInteger<uint64_t>();
+
+            last_def = processOptionDefRow(out_bindings.begin());
+
+            // server_tag
+            ServerTag last_def_server_tag(out_bindings[10]->getString());
+            last_def->setServerTag(last_def_server_tag.get());
+
+            // If we're fetching option definitions for a given server
+            // (explicit server tag is provided), it takes precedence over
+            // the same option definition specified for all servers.
+            // Therefore, we check if the given option already exists and
+            // belongs to 'all'.
+            auto& index = local_option_defs.get<1>();
+            auto existing_it_pair = index.equal_range(last_def->getCode());
+            auto existing_it = existing_it_pair.first;
+            bool found = false;
+            for ( ; existing_it != existing_it_pair.second; ++existing_it) {
+                if ((*existing_it)->getOptionSpaceName() == last_def->getOptionSpaceName()) {
+                    found = true;
+                    // This option definition was already fetched. Let's check
+                    // if we should replace it or not.
+                    if (!last_def_server_tag.amAll() && (*existing_it)->hasAllServerTag()) {
+                        index.replace(existing_it, last_def);
+                        return;
+                    }
+                    break;
+                }
+            }
+
+            // If there is no such option definition yet or the existing option
+            // definition belongs to a different server and the inserted option
+            // definition is not for all servers.
+            if (!found ||
+                (!(*existing_it)->hasServerTag(last_def_server_tag) &&
+                 !last_def_server_tag.amAll())) {
+                static_cast<void>(local_option_defs.push_back(last_def));
+            }
+        }
+    });
+
+    // Append the option definition fetched by this function into the container
+    // supplied by the caller. The container supplied by the caller may already
+    // hold some option definitions fetched for other server tags.
+    option_defs.insert(option_defs.end(), local_option_defs.begin(),
+                       local_option_defs.end());
+}
+
+void
+MySqlConfigBackendImpl::createUpdateOptionDef(const db::ServerSelector& server_selector,
+                                              const OptionDefinitionPtr& option_def,
+                                              const std::string& /*space*/,
+                                              const int& /*get_option_def_code_space*/,
+                                              const int& insert_option_def,
+                                              const int& update_option_def,
+                                              const int& create_audit_revision,
+                                              const int& insert_option_def_server,
+                                              const std::string& client_class_name) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                                  " (unassigned) is unsupported at the moment");
+    }
+
+    auto tag = getServerTag(server_selector, "creating or updating option definition");
+
+    ElementPtr record_types = Element::createList();
+    for (auto field : option_def->getRecordFields()) {
+        record_types->add(Element::create(static_cast<int>(field)));
+    }
+    MySqlBindingPtr record_types_binding = record_types->empty() ?
+        MySqlBinding::createNull() : MySqlBinding::createString(record_types->str());
+
+    MySqlBindingPtr client_class_binding = client_class_name.empty() ?
+        MySqlBinding::createNull() : MySqlBinding::createString(client_class_name);
+
+    MySqlBindingCollection in_bindings = {
+        MySqlBinding::createInteger<uint16_t>(option_def->getCode()),
+        MySqlBinding::createString(option_def->getName()),
+        MySqlBinding::createString(option_def->getOptionSpaceName()),
+        MySqlBinding::createInteger<uint8_t>(static_cast<uint8_t>(option_def->getType())),
+        MySqlBinding::createTimestamp(option_def->getModificationTime()),
+        MySqlBinding::createBool(option_def->getArrayType()),
+        MySqlBinding::createString(option_def->getEncapsulatedSpace()),
+        record_types_binding,
+        createInputContextBinding(option_def),
+        client_class_binding,
+        MySqlBinding::createString(tag),
+        MySqlBinding::createInteger<uint16_t>(option_def->getCode()),
+        MySqlBinding::createString(option_def->getOptionSpaceName()),
+    };
+
+    MySqlTransaction transaction(conn_);
+
+    // Create scoped audit revision. As long as this instance exists
+    // no new audit revisions are created in any subsequent calls.
+    ScopedAuditRevision audit_revision(this,
+                                       create_audit_revision,
+                                       server_selector,
+                                       "option definition set",
+                                       true);
+
+    if (conn_.updateDeleteQuery(update_option_def, in_bindings) == 0) {
+        // Remove the bindings used only during the update.
+        in_bindings.resize(in_bindings.size() - 3);
+        conn_.insertQuery(insert_option_def, in_bindings);
+
+        // Fetch unique identifier of the inserted option definition and use it
+        // as input to the next query.
+        uint64_t id = mysql_insert_id(conn_.mysql_);
+
+        // Insert associations of the option definition with servers.
+        attachElementToServers(insert_option_def_server,
+                               server_selector,
+                               MySqlBinding::createInteger<uint64_t>(id),
+                               MySqlBinding::createTimestamp(option_def->getModificationTime()));
+    }
+
+    transaction.commit();
+}
+
+OptionDescriptorPtr
+MySqlConfigBackendImpl::getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const ServerSelector& server_selector,
+                                  const uint16_t code,
+                                  const std::string& space) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                                  " (unassigned) is unsupported at the moment");
+    }
+
+    auto tag = getServerTag(server_selector, "fetching global option");
+
+    OptionContainer options;
+    MySqlBindingCollection in_bindings;
+    in_bindings.push_back(MySqlBinding::createString(tag));
+    if (universe == Option::V4) {
+        in_bindings.push_back(MySqlBinding::createInteger<uint8_t>(static_cast<uint8_t>(code)));
+    } else {
+        in_bindings.push_back(MySqlBinding::createInteger<uint16_t>(code));
+    }
+    in_bindings.push_back(MySqlBinding::createString(space));
+    getOptions(index, in_bindings, universe, options);
+    return (options.empty() ? OptionDescriptorPtr() :
+            OptionDescriptor::create(*options.begin()));
+}
+
+OptionContainer
+MySqlConfigBackendImpl::getAllOptions(const int index,
+                                      const Option::Universe& universe,
+                                      const ServerSelector& server_selector) {
+    OptionContainer options;
+
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(tag.get())
+        };
+        getOptions(index, in_bindings, universe, options);
+    }
+
+    return (options);
+}
+
+OptionContainer
+MySqlConfigBackendImpl::getModifiedOptions(const int index,
+                                           const Option::Universe& universe,
+                                           const ServerSelector& server_selector,
+                                           const boost::posix_time::ptime& modification_time) {
+    OptionContainer options;
+
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        MySqlBindingCollection in_bindings = {
+            MySqlBinding::createString(tag.get()),
+            MySqlBinding::createTimestamp(modification_time)
+        };
+        getOptions(index, in_bindings, universe, options);
+    }
+
+    return (options);
+}
+
+OptionDescriptorPtr
+MySqlConfigBackendImpl::getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const ServerSelector& server_selector,
+                                  const SubnetID& subnet_id,
+                                  const uint16_t code,
+                                  const std::string& space) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                                  " (unassigned) is unsupported at the moment");
+    }
+
+    auto tag = getServerTag(server_selector, "fetching subnet level option");
+
+    OptionContainer options;
+    MySqlBindingCollection in_bindings;
+    in_bindings.push_back(MySqlBinding::createString(tag));
+    uint32_t id = static_cast<uint32_t>(subnet_id);
+    in_bindings.push_back(MySqlBinding::createInteger<uint32_t>(id));
+    if (universe == Option::V4) {
+        in_bindings.push_back(MySqlBinding::createInteger<uint8_t>(static_cast<uint8_t>(code)));
+    } else {
+        in_bindings.push_back(MySqlBinding::createInteger<uint16_t>(code));
+    }
+    in_bindings.push_back(MySqlBinding::createString(space));
+    getOptions(index, in_bindings, universe, options);
+    return (options.empty() ? OptionDescriptorPtr() :
+            OptionDescriptor::create(*options.begin()));
+}
+
+OptionDescriptorPtr
+MySqlConfigBackendImpl::getOption(const int index,
+                                  const ServerSelector& server_selector,
+                                  const Lease::Type& pool_type,
+                                  const uint64_t pool_id,
+                                  const uint16_t code,
+                                  const std::string& space) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                                  " (unassigned) is unsupported at the moment");
+    }
+
+    std::string msg = "fetching ";
+    if (pool_type == Lease::TYPE_PD) {
+        msg += "prefix delegation";
+    } else {
+        msg += "address";
+    }
+    msg += " pool level option";
+    auto tag = getServerTag(server_selector, msg);
+
+    Option::Universe universe = Option::V4;
+    OptionContainer options;
+    MySqlBindingCollection in_bindings;
+    in_bindings.push_back(MySqlBinding::createString(tag));
+    in_bindings.push_back(MySqlBinding::createInteger<uint64_t>(pool_id));
+    if (pool_type == Lease::TYPE_V4) {
+        in_bindings.push_back(MySqlBinding::createInteger<uint8_t>(static_cast<uint8_t>(code)));
+    } else {
+        in_bindings.push_back(MySqlBinding::createInteger<uint16_t>(code));
+        universe = Option::V6;
+    }
+    in_bindings.push_back(MySqlBinding::createString(space));
+    getOptions(index, in_bindings, universe, options);
+    return (options.empty() ? OptionDescriptorPtr() :
+            OptionDescriptor::create(*options.begin()));
+}
+
+OptionDescriptorPtr
+MySqlConfigBackendImpl::getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const ServerSelector& server_selector,
+                                  const std::string& shared_network_name,
+                                  const uint16_t code,
+                                  const std::string& space) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                                  " (unassigned) is unsupported at the moment");
+    }
+
+    auto tag = getServerTag(server_selector, "fetching shared network level option");
+
+    OptionContainer options;
+    MySqlBindingCollection in_bindings;
+    in_bindings.push_back(MySqlBinding::createString(tag));
+    in_bindings.push_back(MySqlBinding::createString(shared_network_name));
+    if (universe == Option::V4) {
+        in_bindings.push_back(MySqlBinding::createInteger<uint8_t>(static_cast<uint8_t>(code)));
+    } else {
+        in_bindings.push_back(MySqlBinding::createInteger<uint16_t>(code));
+    }
+    in_bindings.push_back(MySqlBinding::createString(space));
+    getOptions(index, in_bindings, universe, options);
+    return (options.empty() ? OptionDescriptorPtr() :
+            OptionDescriptor::create(*options.begin()));
+}
+
+void
+MySqlConfigBackendImpl::getOptions(const int index,
+                                   const db::MySqlBindingCollection& in_bindings,
+                                   const Option::Universe& universe,
+                                   OptionContainer& options) {
+    // Create output bindings. The order must match that in the prepared
+    // statement.
+    MySqlBindingCollection out_bindings;
+    // option_id
+    out_bindings.push_back(MySqlBinding::createInteger<uint64_t>());
+    // code
+    if (universe == Option::V4) {
+        out_bindings.push_back(MySqlBinding::createInteger<uint8_t>());
+    } else {
+        out_bindings.push_back(MySqlBinding::createInteger<uint16_t>());
+    }
+    // value
+    out_bindings.push_back(MySqlBinding::createBlob(OPTION_VALUE_BUF_LENGTH));
+    // formatted_value
+    out_bindings.push_back(MySqlBinding::createString(FORMATTED_OPTION_VALUE_BUF_LENGTH));
+    // space
+    out_bindings.push_back(MySqlBinding::createString(OPTION_SPACE_BUF_LENGTH));
+    // persistent
+    out_bindings.push_back(MySqlBinding::createInteger<uint8_t>());
+    // cancelled
+    out_bindings.push_back(MySqlBinding::createInteger<uint8_t>());
+    // dhcp[46]_subnet_id
+    out_bindings.push_back(MySqlBinding::createInteger<uint32_t>());
+    // scope_id
+    out_bindings.push_back(MySqlBinding::createInteger<uint8_t>());
+    // user_context
+    out_bindings.push_back(MySqlBinding::createString(USER_CONTEXT_BUF_LENGTH));
+    // shared_network_name
+    out_bindings.push_back(MySqlBinding::createString(SHARED_NETWORK_NAME_BUF_LENGTH));
+    // pool_id
+    out_bindings.push_back(MySqlBinding::createInteger<uint64_t>());
+    // modification_ts
+    out_bindings.push_back(MySqlBinding::createTimestamp());
+    // server_tag
+    out_bindings.push_back(MySqlBinding::createString(SERVER_TAG_BUF_LENGTH));
+    // pd_pool_id
+    if (universe == Option::V6) {
+        out_bindings.push_back(MySqlBinding::createInteger<uint64_t>());
+    }
+
+    uint64_t last_option_id = 0;
+
+    OptionContainer local_options;
+
+    conn_.selectQuery(index, in_bindings, out_bindings,
+                      [this, universe, &local_options, &last_option_id]
+                      (MySqlBindingCollection& out_bindings) {
+        // Parse option.
+        if (!out_bindings[0]->amNull() &&
+            ((last_option_id == 0) ||
+             (last_option_id < out_bindings[0]->getInteger<uint64_t>()))) {
+            last_option_id = out_bindings[0]->getInteger<uint64_t>();
+
+            OptionDescriptorPtr desc = processOptionRow(universe, out_bindings.begin());
+            if (desc) {
+                // server_tag for the global option
+                ServerTag last_option_server_tag(out_bindings[13]->getString());
+                desc->setServerTag(last_option_server_tag.get());
+
+                // If we're fetching options for a given server (explicit server
+                // tag is provided), it takes precedence over the same option
+                // specified for all servers. Therefore, we check if the given
+                // option already exists and belongs to 'all'.
+                auto& index = local_options.get<1>();
+                auto existing_it_pair = index.equal_range(desc->option_->getType());
+                auto existing_it = existing_it_pair.first;
+                bool found = false;
+                for ( ; existing_it != existing_it_pair.second; ++existing_it) {
+                    if (existing_it->space_name_ == desc->space_name_) {
+                        found = true;
+                        // This option was already fetched. Let's check if we should
+                        // replace it or not.
+                        if (!last_option_server_tag.amAll() && existing_it->hasAllServerTag()) {
+                            index.replace(existing_it, *desc);
+                            return;
+                        }
+                        break;
+                    }
+                }
+
+                // If there is no such global option yet or the existing option
+                // belongs to a different server and the inserted option is not
+                // for all servers.
+                if (!found ||
+                    (!existing_it->hasServerTag(last_option_server_tag) &&
+                     !last_option_server_tag.amAll())) {
+                    static_cast<void>(local_options.push_back(*desc));
+                }
+            }
+        }
+    });
+
+    // Append the options fetched by this function into the container supplied
+    // by the caller. The container supplied by the caller may already hold
+    // some options fetched for other server tags.
+    options.insert(options.end(), local_options.begin(), local_options.end());
+}
+
+OptionDescriptorPtr
+MySqlConfigBackendImpl::processOptionRow(const Option::Universe& universe,
+                                         MySqlBindingCollection::iterator first_binding) {
+    // Some of the options have standard or custom definitions.
+    // Depending whether the option has a definition or not a different
+    // C++ class may be used to represent the option. Therefore, the
+    // first thing to do is to see if there is a definition for our
+    // parsed option. The option code and space is needed for it.
+    std::string space = (*(first_binding + 4))->getString();
+    uint16_t code;
+    if (universe == Option::V4) {
+        code = (*(first_binding + 1))->getInteger<uint8_t>();
+    } else {
+        code = (*(first_binding + 1))->getInteger<uint16_t>();
+    }
+
+
+    // Get formatted value if available.
+    std::string formatted_value = (*(first_binding + 3))->getStringOrDefault("");
+
+    OptionPtr option = Option::create(universe, code);
+
+    // If we don't have a formatted value, check for a blob. Add it to the
+    // option if it exists.
+    if (formatted_value.empty()) {
+        std::vector<uint8_t> blob;
+        if (!(*(first_binding + 2))->amNull()) {
+            blob = (*(first_binding + 2))->getBlob();
+        }
+        option->setData(blob.begin(), blob.end());
+    }
+
+    // Check if the option is persistent.
+    bool persistent = static_cast<bool>((*(first_binding + 5))->getIntegerOrDefault<uint8_t>(0));
+
+    // Check if the option is cancelled.
+    bool cancelled = static_cast<bool>((*(first_binding + 6))->getIntegerOrDefault<uint8_t>(0));
+
+    // Create option descriptor which encapsulates our option and adds
+    // additional information, i.e. whether the option is persistent,
+    // its option space and timestamp.
+    OptionDescriptorPtr desc = OptionDescriptor::create(option,
+                                                        persistent,
+                                                        cancelled,
+                                                        formatted_value);
+    desc->space_name_ = space;
+    desc->setModificationTime((*(first_binding + 12))->getTimestamp());
+
+    // Set database id for the option.
+    if (!(*first_binding)->amNull()) {
+        desc->setId((*first_binding)->getInteger<uint64_t>());
+    }
+
+    return (desc);
+}
+
+OptionDefinitionPtr
+MySqlConfigBackendImpl::processOptionDefRow(MySqlBindingCollection::iterator first_binding) {
+    OptionDefinitionPtr def;
+
+    // Check array type, because depending on this value we have to use
+    // different constructor.
+    bool array_type = static_cast<bool>((*(first_binding + 6))->getInteger<uint8_t>());
+    if (array_type) {
+        // Create array option.
+        def = OptionDefinition::create((*(first_binding + 2))->getString(),
+                                       (*(first_binding + 1))->getInteger<uint16_t>(),
+                                       (*(first_binding + 3))->getString(),
+                                       static_cast<OptionDataType>
+                                       ((*(first_binding + 4))->getInteger<uint8_t>()),
+                                       array_type);
+    } else {
+        // Create non-array option.
+        def = OptionDefinition::create((*(first_binding + 2))->getString(),
+                                       (*(first_binding + 1))->getInteger<uint16_t>(),
+                                       (*(first_binding + 3))->getString(),
+                                       static_cast<OptionDataType>
+                                       ((*(first_binding + 4))->getInteger<uint8_t>()),
+                                       (*(first_binding + 7))->getStringOrDefault("").c_str());
+    }
+
+    // id
+    def->setId((*(first_binding))->getInteger<uint64_t>());
+
+    // record_types
+    ElementPtr record_types_element = (*(first_binding + 8))->getJSON();
+    if (record_types_element) {
+        if (record_types_element->getType() != Element::list) {
+            isc_throw(BadValue, "invalid record_types value "
+                      << (*(first_binding + 8))->getString());
+        }
+
+        // This element must contain a list of integers specifying
+        // types of the record fields.
+        for (auto i = 0; i < record_types_element->size(); ++i) {
+            auto type_element = record_types_element->get(i);
+            if (type_element->getType() != Element::integer) {
+                isc_throw(BadValue, "record type values must be integers");
+            }
+
+            def->addRecordField(static_cast<OptionDataType>(type_element->intValue()));
+        }
+    }
+
+    // Update modification time.
+    def->setModificationTime((*(first_binding + 5))->getTimestamp());
+
+    return (def);
+}
+
+void
+MySqlConfigBackendImpl::attachElementToServers(const int index,
+                                               const ServerSelector& server_selector,
+                                               const MySqlBindingPtr& first_binding,
+                                               const MySqlBindingPtr& in_bindings) {
+    // Create the vector from the parameter pack.
+    MySqlBindingCollection in_server_bindings = { first_binding, in_bindings };
+    for (auto const& tag : server_selector.getTags()) {
+        in_server_bindings.push_back(MySqlBinding::createString(tag.get()));
+        // Handles the case where the server does not exists.
+        try {
+            conn_.insertQuery(index, in_server_bindings);
+        } catch (const NullKeyError&) {
+            // The message should give the tag value.
+            isc_throw(NullKeyError,
+                      "server '" << tag.get() << "' does not exist");
+        }
+        in_server_bindings.pop_back();
+    }
+}
+
+MySqlBindingPtr
+MySqlConfigBackendImpl::createInputRelayBinding(const NetworkPtr& network) {
+    ElementPtr relay_element = Element::createList();
+    const auto& addresses = network->getRelayAddresses();
+    if (!addresses.empty()) {
+        for (const auto& address : addresses) {
+            relay_element->add(Element::create(address.toText()));
+        }
+    }
+
+    return (relay_element->empty() ? MySqlBinding::createNull() :
+            MySqlBinding::condCreateString(relay_element->str()));
+}
+
+MySqlBindingPtr
+MySqlConfigBackendImpl::createOptionValueBinding(const OptionDescriptorPtr& option) {
+    OptionPtr opt = option->option_;
+    if (option->formatted_value_.empty() && (opt->len() > opt->getHeaderLen())) {
+        OutputBuffer buf(opt->len());
+        opt->pack(buf);
+        const char* buf_ptr = static_cast<const char*>(buf.getData());
+        std::vector<uint8_t> blob(buf_ptr + opt->getHeaderLen(),
+                                  buf_ptr + buf.getLength());
+        return (MySqlBinding::createBlob(blob.begin(), blob.end()));
+
+    }
+
+    return (MySqlBinding::createNull());
+}
+
+ServerPtr
+MySqlConfigBackendImpl::getServer(const int index, const ServerTag& server_tag) {
+    ServerCollection servers;
+    MySqlBindingCollection in_bindings = {
+        MySqlBinding::createString(server_tag.get())
+    };
+    getServers(index, in_bindings, servers);
+
+    return (servers.empty() ? ServerPtr() : *servers.begin());
+}
+
+void
+MySqlConfigBackendImpl::getAllServers(const int index, db::ServerCollection& servers) {
+    MySqlBindingCollection in_bindings;
+    getServers(index, in_bindings, servers);
+}
+
+void
+MySqlConfigBackendImpl::getServers(const int index,
+                                   const MySqlBindingCollection& in_bindings,
+                                   ServerCollection& servers) {
+    MySqlBindingCollection out_bindings = {
+        MySqlBinding::createInteger<uint64_t>(),
+        MySqlBinding::createString(SERVER_TAG_BUF_LENGTH),
+        MySqlBinding::createString(SERVER_DESCRIPTION_BUF_LENGTH),
+        MySqlBinding::createTimestamp()
+    };
+
+    conn_.selectQuery(index, in_bindings, out_bindings,
+                      [&servers](MySqlBindingCollection& out_bindings) {
+
+        ServerPtr last_server;
+        uint64_t id = out_bindings[0]->getInteger<uint64_t>();
+        if (!last_server || (last_server->getId() != id)) {
+
+            // Set description if it is non-null.
+            auto desc = (out_bindings[2]->amNull() ? "" : out_bindings[2]->getString());
+            last_server = Server::create(ServerTag(out_bindings[1]->getString()),
+                                         desc);
+
+            // id
+            last_server->setId(id);
+
+            // modification_ts
+            last_server->setModificationTime(out_bindings[3]->getTimestamp());
+
+            // New server fetched. Let's store it.
+            servers.insert(last_server);
+        }
+    });
+}
+
+void
+MySqlConfigBackendImpl::createUpdateServer(const int& create_audit_revision,
+                                           const int& create_index,
+                                           const int& update_index,
+                                           const ServerPtr& server) {
+    // The server tag 'all' is reserved.
+    if (server->getServerTag().amAll()) {
+        isc_throw(InvalidOperation,
+                  "'all' is a name reserved for the server tag which"
+                  " associates the configuration elements with all servers connecting"
+                  " to the database and a server with this name may not be created");
+    }
+
+    // Create scoped audit revision. As long as this instance exists
+    // no new audit revisions are created in any subsequent calls.
+    ScopedAuditRevision audit_revision(this,
+                                       create_audit_revision,
+                                       ServerSelector::ALL(),
+                                       "server set",
+                                       true);
+
+    MySqlTransaction transaction(conn_);
+
+    MySqlBindingCollection in_bindings = {
+        MySqlBinding::createString(server->getServerTagAsText()),
+        MySqlBinding::createString(server->getDescription()),
+        MySqlBinding::createTimestamp(server->getModificationTime())
+    };
+
+    try {
+        conn_.insertQuery(create_index, in_bindings);
+
+    } catch (const DuplicateEntry&) {
+        in_bindings.push_back(MySqlBinding::createString(server->getServerTagAsText()));
+        conn_.updateDeleteQuery(update_index, in_bindings);
+    }
+
+    transaction.commit();
+}
+
+std::string
+MySqlConfigBackendImpl::getType() const {
+    return ("mysql");
+}
+
+std::string
+MySqlConfigBackendImpl::getHost() const {
+    std::string host = "localhost";
+    try {
+        host = conn_.getParameter("host");
+    } catch (...) {
+        // No host parameter. Return localhost as a default.
+    }
+    return (host);
+}
+
+uint16_t
+MySqlConfigBackendImpl::getPort() const {
+    try {
+        std::string sport = conn_.getParameter("port");
+        return (boost::lexical_cast<uint16_t>(sport));
+
+    } catch (...) {
+        // No port parameter or parameter invalid.
+    }
+    return (0);
+}
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_impl.h b/src/hooks/dhcp/mysql_cb/mysql_cb_impl.h
new file mode 100644
index 0000000..a822a5c
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_impl.h
@@ -0,0 +1,874 @@
+// Copyright (C) 2018-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef MYSQL_CONFIG_BACKEND_IMPL_H
+#define MYSQL_CONFIG_BACKEND_IMPL_H
+
+#include <cc/stamped_value.h>
+#include <database/audit_entry.h>
+#include <database/database_connection.h>
+#include <database/server.h>
+#include <database/server_collection.h>
+#include <database/server_selector.h>
+#include <dhcp/option.h>
+#include <dhcp/option_definition.h>
+#include <dhcpsrv/cfg_option.h>
+#include <dhcpsrv/lease.h>
+#include <dhcpsrv/network.h>
+#include <dhcpsrv/subnet_id.h>
+#include <exceptions/exceptions.h>
+#include <util/triplet.h>
+#include <mysql/mysql_binding.h>
+#include <mysql/mysql_connection.h>
+#include <set>
+#include <sstream>
+#include <string>
+#include <vector>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Base class for MySQL Config Backend implementations.
+///
+/// This class contains common methods for manipulating data in the
+/// MySQL database, used by all servers.
+///
+/// All POSIX times specified in the methods belonging to this
+/// class must be local times.
+class MySqlConfigBackendImpl {
+protected:
+
+    /// @brief RAII object used to protect against creating multiple
+    /// audit revisions during cascade configuration updates.
+    ///
+    /// Audit revision is created per a single database transaction.
+    /// It includes log message associated with the configuration
+    /// change. Single command sent over the control API should
+    /// result in a single audit revision entry in the database.
+    /// A single configuration update often consists of multiple
+    /// insertions, updates and/or deletes in the database. For
+    /// example, a subnet contains pools and DHCP options which are
+    /// inserted to their respective tables. We refer to such update
+    /// as a cascade update. Cascade update should result in a single
+    /// audit revision and an audit entry for a subnet, rather than
+    /// multiple audit revisions and audit entries for the subnet,
+    /// pools and child DHCP options.
+    ///
+    /// Creating an instance of the @c ScopedAuditRevision guards
+    /// against creation of multiple audit revisions when child
+    /// objects are inserted or updated in the database. When the
+    /// instance of this object goes out of scope the new audit
+    /// revisions can be created. The caller must ensure that
+    /// the instance of this object exists throughout the whole
+    /// transaction with the database.
+    class ScopedAuditRevision {
+    public:
+
+        /// @brief Constructor.
+        ///
+        /// Creates new audit revision and sets the flag in the
+        /// MySQL CB implementation object which prevents new audit
+        /// revisions to be created while this instance exists.
+        ///
+        /// @param impl pointer to the MySQL CB implementation.
+        /// @param index index of the query to set session variables
+        /// used for creation of the audit revision and the audit
+        /// entries.
+        /// @param server_selector Server selector.
+        /// @param log_message log message associated with the audit
+        /// revision to be inserted into the database.
+        /// @param cascade_transaction boolean flag indicating if
+        /// we're performing cascade transaction. If set to true,
+        /// the audit entries for the child objects (e.g. DHCP
+        /// options) won't be created.
+        ScopedAuditRevision(MySqlConfigBackendImpl* impl,
+                            const int index,
+                            const db::ServerSelector& server_selector,
+                            const std::string& log_message,
+                            bool cascade_transaction);
+
+        /// @brief Destructor.
+        ///
+        /// Clears the flag which is blocking creation of the new
+        /// audit revisions.
+        ~ScopedAuditRevision();
+
+    private:
+
+        /// @brief Pointer to the MySQL CB implementation.
+        MySqlConfigBackendImpl* impl_;
+    };
+
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    /// @param db_reconnect_callback The connection recovery callback.
+    explicit MySqlConfigBackendImpl(const db::DatabaseConnection::ParameterMap& parameters,
+                                    const db::DbCallback db_reconnect_callback);
+
+    /// @brief Destructor.
+    virtual ~MySqlConfigBackendImpl();
+
+    /// @brief Creates MySQL binding from an @c Optional of integer type.
+    ///
+    /// @tparam T Numeric type corresponding to the binding type, e.g.
+    /// @c uint8_t, @c uint16_t etc.
+    /// @param value Optional integer of type T.
+    /// @return Pointer to a null binding if the value is "unspecified" or
+    /// a pointer to a binding representing integer value.
+    template<typename T>
+    static db::MySqlBindingPtr condCreateInteger(const util::Optional<T>& value) {
+        if (value.unspecified()) {
+            return (db::MySqlBinding::createNull());
+        }
+        return (db::MySqlBinding::createInteger(value.get()));
+    }
+
+    /// @brief Creates MySQL binding from a @c Triplet.
+    ///
+    /// @param triplet Triplet value from which the binding should be created.
+    /// @return Pointer to a null binding if the triplet is "unspecified" or
+    /// a pointer to a binding representing 32-bit unsigned integer value
+    /// otherwise.
+    static db::MySqlBindingPtr createBinding(const util::Triplet<uint32_t>& triplet);
+
+    /// @brief Creates MySQL binding from a @c Triplet max value.
+    ///
+    /// @param triplet Triplet value from which the binding should be created.
+    /// @return Pointer to a null binding if the triplet is "unspecified" or
+    /// the max value is the same as the default value, or a pointer to
+    /// a binding representing 32-bit unsigned integer value from the max
+    /// value otherwise.
+    static db::MySqlBindingPtr createMaxBinding(const util::Triplet<uint32_t>& triplet);
+
+    /// @brief Creates MySQL binding from a @c Triplet min value.
+    ///
+    /// @param triplet Triplet value from which the binding should be created.
+    /// @return Pointer to a null binding if the triplet is "unspecified" or
+    /// the min value is the same as the default value, or a pointer to
+    /// a binding representing 32-bit unsigned integer value from the min
+    /// value otherwise.
+    static db::MySqlBindingPtr createMinBinding(const util::Triplet<uint32_t>& triplet);
+
+    /// @brief Creates @c Triplet object from MySQL binding.
+    ///
+    /// @param binding Pointer to the MySQL binding.
+    /// @return Triplet value set to "unspecified" if the MySQL binding
+    /// represents a NULL value or a Triplet value encapsulating 32-bit
+    /// unsigned integer if the MySQL represents an integer.
+    /// @throw isc::Unexpected if the provided binding pointer is NULL.
+    /// @throw isc::InvalidOperation if the binding does not represent
+    /// a 32-bit unsigned integer.
+    static util::Triplet<uint32_t> createTriplet(const db::MySqlBindingPtr& binding);
+
+    /// @brief Creates @c Triplet object from MySQL bindings.
+    ///
+    /// @param def_binding Pointer to the MySQL binding of the default.
+    /// @param min_binding Pointer to the MySQL binding of the min value.
+    /// @param max_binding Pointer to the MySQL binding of the max value.
+    /// @return Triplet value set to "unspecified" if the MySQL binding
+    /// represents a NULL value or a Triplet value encapsulating 32-bit
+    /// unsigned integer if the MySQL represents an integer.
+    /// When max or max bindings are not NULL their values are used.
+    /// @throw isc::Unexpected if the provided binding pointer is NULL.
+    /// @throw isc::InvalidOperation if the binding does not represent
+    /// a 32-bit unsigned integer.
+    static util::Triplet<uint32_t> createTriplet(const db::MySqlBindingPtr& def_binding,
+                                                 const db::MySqlBindingPtr& min_binding,
+                                                 const db::MySqlBindingPtr& max_binding);
+
+    /// @brief Returns server tag associated with the particular selector.
+    ///
+    /// This method expects that there is exactly one server tag associated with
+    /// the server selector.
+    ///
+    /// @param server_selector Server selector.
+    /// @param operation Operation which results in calling this function. This is
+    /// used for error reporting purposes.
+    /// @return Server tag.
+    /// @throw InvalidOperation if the server selector is unassigned or if there
+    /// is more than one server tag associated with the selector.
+    std::string getServerTag(const db::ServerSelector& server_selector,
+                             const std::string& operation) const {
+        auto const& tags = server_selector.getTags();
+        if (tags.size() != 1) {
+            isc_throw(InvalidOperation, "expected exactly one server tag to be specified"
+                      " while " << operation << ". Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        return (tags.begin()->get());
+    }
+
+    /// @brief Returns server tags associated with the particular selector
+    /// as text.
+    ///
+    /// This method is useful for logging purposes.
+    std::string getServerTagsAsText(const db::ServerSelector& server_selector) const {
+        std::ostringstream s;
+        auto const& server_tags = server_selector.getTags();
+        for (auto const& tag : server_tags) {
+            if (s.tellp() != 0) {
+                s << ", ";
+            }
+            s << tag.get();
+        }
+
+        return (s.str());
+    }
+
+    /// @brief Invokes the corresponding stored procedure in MySQL.
+    ///
+    /// The @c createAuditRevision stored procedure creates new audit
+    /// revision and initializes several session variables to be used when
+    /// the audit entries will be created for the inserted, updated or
+    /// deleted configuration elements.
+    ///
+    /// @param index query index.
+    /// @param server_selector Server selector.
+    /// @param audit_ts Timestamp to be associated with the audit
+    /// revision.
+    /// @param log_message log message to be used for the audit revision.
+    /// @param cascade_transaction Boolean value indicating whether the
+    /// configuration modification is performed as part of the owning
+    /// element modification, e.g. subnet is modified resulting in
+    /// modification of the DHCP options it owns. In that case only the
+    /// audit entry for the owning element should be created.
+    void createAuditRevision(const int index,
+                             const db::ServerSelector& server_selector,
+                             const boost::posix_time::ptime& audit_ts,
+                             const std::string& log_message,
+                             const bool cascade_transaction);
+
+    /// @brief Clears the flag blocking creation of the new audit revisions.
+    ///
+    /// This is used by the @c ScopedAuditRevision object.
+    void clearAuditRevision();
+
+    /// @brief Sends query to the database to retrieve most recent audit entries.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param modification_time Timestamp being a lower limit for the returned
+    /// result set, i.e. entries later than specified time are returned.
+    /// @param modification_id Identifier being a lower limit for the returned
+    /// result set, used when two (or more) revisions have the same
+    /// modification_time.
+    /// @param [out] audit_entries Reference to the container where fetched audit
+    /// entries will be inserted.
+    void getRecentAuditEntries(const int index,
+                               const db::ServerSelector& server_selector,
+                               const boost::posix_time::ptime& modification_time,
+                               const uint64_t& modification_id,
+                               db::AuditEntryCollection& audit_entries);
+
+    /// @brief Sends query to delete rows from a table.
+    ///
+    /// @param index Index of the statement to be executed.
+    /// @param server_selector Server selector.
+    /// @param operation Operation which results in calling this function. This is
+    /// used for logging purposes.
+    /// @param in_bindings Reference to the MySQL input bindings. They are modified
+    /// as a result of this function - server tag is inserted into the beginning
+    /// of the bindings collection.
+    /// @return Number of deleted rows.
+    uint64_t deleteFromTable(const int index,
+                             const db::ServerSelector& server_selector,
+                             const std::string& operation,
+                             db::MySqlBindingCollection& in_bindings) {
+
+        // For ANY server, we use queries that lack server tag.
+        if (!server_selector.amAny() && !server_selector.amUnassigned()) {
+            auto tag = getServerTag(server_selector, operation);
+            in_bindings.insert(in_bindings.begin(), db::MySqlBinding::createString(tag));
+        }
+
+        return (conn_.updateDeleteQuery(index, in_bindings));
+    }
+
+    /// @brief Sends query to delete rows from a table.
+    ///
+    /// @param index Index of the statement to be executed.
+    /// @param server_selector Server selector.
+    /// @param operation Operation which results in calling this function. This is
+    /// used for error reporting purposes.
+    /// @return Number of deleted rows.
+    uint64_t deleteFromTable(const int index,
+                             const db::ServerSelector& server_selector,
+                             const std::string& operation);
+
+    /// @brief Sends query to delete rows from a table.
+    ///
+    /// @tparam KeyType Type of the key used as the second binding. The
+    /// server tag is used as first binding.
+    ///
+    /// @param index Index of the statement to be executed.
+    /// @param server_selector Server selector.
+    /// @param operation Operation which results in calling this function. This is
+    /// used for error reporting purposes.
+    /// @param key Value to be used as input binding to the delete
+    /// statement. The default value is empty which indicates that the
+    /// key should not be used in the query.
+    /// @return Number of deleted rows.
+    /// @throw InvalidOperation if the server selector is unassigned or
+    /// if there are more than one server tags associated with the
+    /// server selector.
+    template<typename KeyType>
+    uint64_t deleteFromTable(const int index,
+                             const db::ServerSelector& server_selector,
+                             const std::string& operation,
+                             KeyType key) {
+        // When deleting by some key, we must use ANY.
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "deleting an unassigned object requires "
+                      "an explicit server tag or using ANY server. The UNASSIGNED "
+                      "server selector is currently not supported");
+        }
+
+        db::MySqlBindingCollection in_bindings;
+
+        if (db::MySqlBindingTraits<KeyType>::column_type == MYSQL_TYPE_STRING) {
+            in_bindings.push_back(db::MySqlBinding::createString(key));
+
+        } else {
+            in_bindings.push_back(db::MySqlBinding::createInteger<KeyType>(key));
+        }
+
+        return (deleteFromTable(index, server_selector, operation, in_bindings));
+    }
+
+    /// @brief Sends query to retrieve multiple global parameters.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] parameters Reference to the container where fetched parameters
+    /// will be inserted.
+    void getGlobalParameters(const int index,
+                             const db::MySqlBindingCollection& in_bindings,
+                             data::StampedValueCollection& parameters);
+
+    /// @brief Sends query to retrieve single option definition by code and
+    /// option space.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param code Option code.
+    /// @param space Option space name.
+    ///
+    /// @return Pointer to the returned option definition or NULL if such
+    /// option definition doesn't exist.
+    OptionDefinitionPtr getOptionDef(const int index,
+                                     const db::ServerSelector& server_selector,
+                                     const uint16_t code,
+                                     const std::string& space);
+
+    /// @brief Sends query to retrieve all option definitions.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param [out] option_defs Reference to the container where option
+    /// definitions are to be stored.
+    void getAllOptionDefs(const int index,
+                          const db::ServerSelector& server_selector,
+                          OptionDefContainer& option_defs);
+
+    /// @brief Sends query to retrieve option definitions with modification
+    /// time later than specified timestamp.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound subnet modification time.
+    /// @param [out] option_defs Reference to the container where option
+    /// definitions are to be stored.
+    void getModifiedOptionDefs(const int index,
+                               const db::ServerSelector& server_selector,
+                               const boost::posix_time::ptime& modification_time,
+                               OptionDefContainer& option_defs);
+
+    /// @brief Sends query to the database to retrieve multiple option
+    /// definitions.
+    ///
+    /// Query should order option definitions by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] option_defs Reference to the container where fetched
+    /// option definitions will be inserted.
+    void getOptionDefs(const int index,
+                       const db::MySqlBindingCollection& in_bindings,
+                       OptionDefContainer& option_defs);
+
+    /// @brief Creates or updates an option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Option definition to be added or updated.
+    /// @param space Default option space
+    /// @param get_option_def_code_space Statement getting option
+    /// definition by code and space.
+    /// @param insert_option_def Statement inserting option definition.
+    /// @param update_option_def Statement updating option definition.
+    /// @param create_audit_revision Statement creating audit revision.
+    /// @param insert_option_def_server Statement associating option
+    /// definition with a server.
+    /// @param client_class_name Optional client class name to which
+    /// the option definition belongs. If this value is not specified,
+    /// it is a global option definition.
+    /// @throw NotImplemented if server selector is "unassigned".
+    void createUpdateOptionDef(const db::ServerSelector& server_selector,
+                               const OptionDefinitionPtr& option_def,
+                               const std::string& space,
+                               const int& get_option_def_code_space,
+                               const int& insert_option_def,
+                               const int& update_option_def,
+                               const int& create_audit_revision,
+                               const int& insert_option_def_server,
+                               const std::string& client_class_name = "");
+
+    /// @brief Sends query to retrieve single global option by code and
+    /// option space.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param server_selector Server selector.
+    /// @param code Option code.
+    /// @param space Option space name.
+    ///
+    /// @return Pointer to the returned option or NULL if such option
+    /// doesn't exist.
+    OptionDescriptorPtr getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const db::ServerSelector& server_selector,
+                                  const uint16_t code,
+                                  const std::string& space);
+
+    /// @brief Sends query to retrieve all global options.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param server_selector Server selector.
+    /// @return Container holding returned options.
+    OptionContainer getAllOptions(const int index,
+                                  const Option::Universe& universe,
+                                  const db::ServerSelector& server_selector);
+
+    /// @brief Sends query to retrieve global options with modification
+    /// time later than specified timestamp.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param server_selector Server selector.
+    /// @return Container holding returned options.
+    OptionContainer getModifiedOptions(const int index,
+                                       const Option::Universe& universe,
+                                       const db::ServerSelector& server_selector,
+                                       const boost::posix_time::ptime& modification_time);
+
+    /// @brief Sends query to retrieve single option by code and option space
+    /// for a given subnet id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param server_selector Server selector.
+    /// @param subnet_id Subnet identifier.
+    /// @param code Option code.
+    /// @param space Option space name.
+    ///
+    /// @return Pointer to the returned option descriptor or NULL if such
+    /// option doesn't exist.
+    OptionDescriptorPtr getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const db::ServerSelector& server_selector,
+                                  const dhcp::SubnetID& subnet_id,
+                                  const uint16_t code,
+                                  const std::string& space);
+
+    /// @brief Sends query to retrieve single option by code and option space
+    /// for a given address or prefix delegation (v6) pool id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param pool_type Pool type (Lease::TYPE_V4, TYPE_NA or TYPE_PD).
+    /// @param pool_id Pool identifier in the database.
+    /// @param code Option code.
+    /// @param space Option space name.
+    ///
+    /// @return Pointer to the returned option descriptor or NULL if such
+    /// option doesn't exist.
+    OptionDescriptorPtr getOption(const int index,
+                                  const db::ServerSelector& server_selector,
+                                  const dhcp::Lease::Type& pool_type,
+                                  const uint64_t pool_id,
+                                  const uint16_t code,
+                                  const std::string& space);
+
+    /// @brief Sends query to retrieve single option by code and option space
+    /// for a given shared network.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Shared network name.
+    /// @param code Option code.
+    /// @param space Option space name.
+    ///
+    /// @return Pointer to the returned option descriptor or NULL if such
+    /// option doesn't exist.
+    OptionDescriptorPtr getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const db::ServerSelector& server_selector,
+                                  const std::string& shared_network_name,
+                                  const uint16_t code,
+                                  const std::string& space);
+
+    /// @brief Sends query to the database to retrieve multiple options.
+    ///
+    /// Query should order by option_id.
+    ///
+    /// @note The universe is reused to switch between DHCPv4 and DHCPv6
+    /// option layouts.
+    /// @param family Address family (either AF_INET or AF_INET6).
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param [out] options Reference to the container where fetched options
+    /// will be inserted.
+    void getOptions(const int index,
+                    const db::MySqlBindingCollection& in_bindings,
+                    const Option::Universe& universe,
+                    OptionContainer& options);
+
+    /// @brief Returns DHCP option instance from output bindings.
+    ///
+    /// The following is the expected order of columns specified in the SELECT
+    /// query:
+    /// - option_id,
+    /// - code,
+    /// - value,
+    /// - formatted_value,
+    /// - space,
+    /// - persistent,
+    /// - cancelled,
+    /// - dhcp4_subnet_id/dhcp6_subnet_id,
+    /// - scope_id,
+    /// - user_context,
+    /// - shared_network_name,
+    /// - pool_id,
+    /// - [pd_pool_id,]
+    /// - modification_ts
+    ///
+    /// @note The universe is reused to switch between DHCPv4 and DHCPv6
+    /// option layouts.
+    /// @param universe V4 or V6.
+    /// @param first_binding Iterator of the output binding containing
+    /// option_id.
+    OptionDescriptorPtr processOptionRow(const Option::Universe& universe,
+                                         db::MySqlBindingCollection::iterator first_binding);
+
+    /// @brief Returns DHCP option definition instance from output bindings.
+    ///
+    /// The following is the expected order of columns specified in the SELECT
+    /// query:
+    /// - id,
+    /// - code,
+    /// - name,
+    /// - space,
+    /// - type,
+    /// - modification_ts,
+    /// - is_array,
+    /// - encapsulate,
+    /// - record_types,
+    /// - user_context
+    ///
+    /// @param first_binding Iterator of the output binding containing
+    /// option definition id.
+    /// @return Pointer to the option definition.
+    OptionDefinitionPtr processOptionDefRow(db::MySqlBindingCollection::iterator first_binding);
+
+    /// @brief Associates a configuration element with multiple servers.
+    ///
+    /// @param index Query index.
+    /// @param server_selector Server selector, perhaps with multiple server tags.
+    /// @param first_binding First binding to be used in the query.
+    /// @param in_bindings Parameter pack holding bindings for the query. Note that
+    /// the server tag (or server id) must be the last binding in the prepared
+    /// statement. The caller must not include this binding in the parameter pack.
+    void attachElementToServers(const int index,
+                                const db::ServerSelector& server_selector,
+                                const db::MySqlBindingPtr& first_binding,
+                                const db::MySqlBindingPtr& in_bindings);
+
+    /// @brief Creates input binding for relay addresses.
+    ///
+    /// @param network Pointer to a shared network or subnet for which binding
+    /// should be created.
+    /// @return Pointer to the binding (possibly null binding if there are no
+    /// relay addresses specified).
+    db::MySqlBindingPtr createInputRelayBinding(const NetworkPtr& network);
+
+    /// @brief Creates input binding for 'require_client_classes' parameter.
+    ///
+    /// @tparam T of pointer to objects with getRequiredClasses
+    /// method, e.g. shared network, subnet, pool or prefix delegation pool.
+    /// @param object Pointer to an object with getRequiredClasses method
+    /// @return Pointer to the binding (possibly null binding if there are no
+    /// required classes specified).
+    template<typename T>
+    db::MySqlBindingPtr createInputRequiredClassesBinding(const T& object) {
+        // Create JSON list of required classes.
+        data::ElementPtr required_classes_element = data::Element::createList();
+        const auto& required_classes = object->getRequiredClasses();
+        for (auto required_class = required_classes.cbegin();
+             required_class != required_classes.cend();
+             ++required_class) {
+            required_classes_element->add(data::Element::create(*required_class));
+        }
+
+        return (required_classes_element ?
+                db::MySqlBinding::createString(required_classes_element->str()) :
+                db::MySqlBinding::createNull());
+    }
+
+    /// @brief Creates input binding for user context parameter.
+    ///
+    /// @tparam T Type of the configuration element to which context belongs.
+    /// @param network Pointer to a shared network, subnet or other configuration
+    /// element for which binding should be created.
+    /// @return Pointer to the binding (possibly null binding if context is
+    /// null).
+    template<typename T>
+    db::MySqlBindingPtr createInputContextBinding(const T& config_element) {
+        // Create user context binding if user context exists.
+        auto context_element = config_element->getContext();
+        return (context_element ? db::MySqlBinding::createString(context_element->str()) :
+                db::MySqlBinding::createNull());
+    }
+
+    /// @brief Creates input binding for option value parameter.
+    ///
+    /// @param option Option descriptor holding option for which binding is to
+    /// be created.
+    /// @return Pointer to the binding (possibly null binding if formatted
+    /// value is non-empty.
+    db::MySqlBindingPtr createOptionValueBinding(const OptionDescriptorPtr& option);
+
+    /// @brief Retrieves a server.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_tag Server tag of the server to be retrieved.
+    /// @return Pointer to the @c Server object representing the server or
+    /// null if such server doesn't exist.
+    db::ServerPtr getServer(const int index, const data::ServerTag& server_tag);
+
+    /// @brief Retrieves all servers.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param [out] servers Reference to the container where fetched servers
+    /// will be inserted.
+    void getAllServers(const int index, db::ServerCollection& servers);
+
+    /// @brief Sends query to retrieve servers.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Reference to the MySQL input bindings.
+    /// @param [out] servers Reference to the container where fetched servers
+    /// will be inserted.
+    void getServers(const int index,
+                    const db::MySqlBindingCollection& in_bindings,
+                    db::ServerCollection& servers);
+
+    /// @brief Creates or updates a server.
+    ///
+    /// This method attempts to insert a new server into the database using
+    /// the query identified by @c create_index. If the insertion fails because
+    /// the server with the given tag already exists in the database, the
+    /// existing server is updated using the query identified by the
+    /// @c update_index.
+    ///
+    /// @param create_audit_revision Index of the query inserting audit
+    /// revision.
+    /// @param create_index Index of the INSERT query to be used.
+    /// @param update_index Index of the UPDATE query to be used.
+    /// @param server Pointer to the server to be inserted or updated.
+    /// @throw InvalidOperation when trying to create a duplicate or
+    /// update the logical server 'all'.
+    void createUpdateServer(const int& create_audit_revision,
+                            const int& create_index,
+                            const int& update_index,
+                            const db::ServerPtr& server);
+
+    /// @brief Executes multiple update and/or delete queries with no input
+    /// bindings.
+    ///
+    /// This is a convenience function which takes multiple query indexes as
+    /// arguments and for each index executes an update or delete query.
+    /// One of the applications of this function is to remove dangling
+    /// configuration elements after the server associated with these elements
+    /// have been deleted.
+    ///
+    /// @tparam T type of the indexes, e.g. @c MySqlConfigBackendDHCPv4Impl::StatementIndex.
+    /// @tparam R parameter pack holding indexes of type @c T.
+    /// @param first_index first index.
+    /// @param other_indexes remaining indexes.
+    template<typename T, typename... R>
+    void multipleUpdateDeleteQueries(T first_index, R... other_indexes) {
+        std::vector<T> indexes({ first_index, other_indexes... });
+        db::MySqlBindingCollection empty_bindings;
+        for (auto index : indexes) {
+            conn_.updateDeleteQuery(index, empty_bindings);
+        }
+    }
+
+    /// @brief Removes configuration elements from the index which don't match
+    /// the specified server selector.
+    ///
+    /// This is a generic function which removes configuration elements which
+    /// don't match the specified selector. In order to fetch all server tags
+    /// for the returned configuration element, the query must not limit the
+    /// results to the given server tag. Instead, it must post process the
+    /// result to eliminate those configuration elements for which the desired
+    /// server tag wasn't found.
+    ///
+    /// If the server selector is set to ANY, this method is no-op.
+    ///
+    /// @tparam CollectionIndex Type of the collection to be processed.
+    /// @param server_selector Server selector.
+    /// @param index Reference to the index holding the returned configuration
+    /// elements to be processed.
+    template<typename CollectionIndex>
+    void tossNonMatchingElements(const db::ServerSelector& server_selector,
+                                 CollectionIndex& index) {
+        // Don't filter the matching server tags if the server selector is
+        // set to ANY.
+        if (server_selector.amAny()) {
+            return;
+        }
+
+        // Go over the collection of elements.
+        for (auto elem = index.begin(); elem != index.end();) {
+
+            // If we're asking for shared networks matching all servers,
+            // we have to make sure that the fetched element has "all"
+            // server tag.
+            if (server_selector.amAll()) {
+                if (!(*elem)->hasAllServerTag()) {
+                    // It doesn't so let's remove it.
+                    elem = index.erase(elem);
+                    continue;
+                }
+
+            } else if (server_selector.amUnassigned()) {
+                // Returned element has server tags but we expect that the
+                // elements are unassigned.
+                if (!(*elem)->getServerTags().empty()) {
+                    elem = index.erase(elem);
+                    continue;
+                }
+
+            } else {
+                // Server selector contains explicit server tags, so
+                // let's see if the returned elements includes any of
+                // them.
+                auto const& tags = server_selector.getTags();
+                bool tag_found = false;
+                for (auto const& tag : tags) {
+                    if ((*elem)->hasServerTag(tag) ||
+                        (*elem)->hasAllServerTag()) {
+                        tag_found = true;
+                        break;
+                    }
+                }
+                if (!tag_found) {
+                    // Tag not matching, so toss the element.
+                    elem = index.erase(elem);
+                    continue;
+                }
+            }
+
+            // Go to the next element if we didn't toss the current one.
+            // Otherwise, the erase() function should have already taken
+            // us to the next one.
+            ++elem;
+        }
+    }
+
+    /// @brief Returns backend type in the textual format.
+    ///
+    /// @return "mysql".
+    std::string getType() const;
+
+    /// @brief Returns backend host.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return host on which the database is located.
+    std::string getHost() const;
+
+    /// @brief Returns backend port number.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return Port number on which database service is available.
+    uint16_t getPort() const;
+
+    /// @brief Return backend parameters
+    ///
+    /// Returns the backend parameters
+    ///
+    /// @return Parameters of the backend.
+    const isc::db::DatabaseConnection::ParameterMap& getParameters() {
+        return (parameters_);
+    }
+
+    /// @brief Sets IO service to be used by the MySQL config backend.
+    ///
+    /// @param IOService object, used for all ASIO operations.
+    static void setIOService(const isc::asiolink::IOServicePtr& io_service) {
+        io_service_ = io_service;
+    }
+
+    /// @brief Returns pointer to the IO service.
+    static isc::asiolink::IOServicePtr& getIOService() {
+        return (io_service_);
+    }
+
+    /// @brief Represents connection to the MySQL database.
+    db::MySqlConnection conn_;
+
+protected:
+
+    /// @brief Timer name used to register database reconnect timer.
+    std::string timer_name_;
+
+private:
+
+    /// @brief Reference counter for @ScopedAuditRevision instances.
+    int audit_revision_ref_count_;
+
+    /// @brief Connection parameters
+    isc::db::DatabaseConnection::ParameterMap parameters_;
+
+    /// @brief The IOService object, used for all ASIO operations.
+    static isc::asiolink::IOServicePtr io_service_;
+};
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
+
+#endif
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_log.cc b/src/hooks/dhcp/mysql_cb/mysql_cb_log.cc
new file mode 100644
index 0000000..1177720
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_log.cc
@@ -0,0 +1,17 @@
+// Copyright (C) 2019-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <mysql_cb_log.h>
+
+namespace isc {
+namespace dhcp {
+
+isc::log::Logger mysql_cb_logger("mysql-cb-hooks");
+
+}  // namespace dhcp
+}  // namespace isc
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_log.h b/src/hooks/dhcp/mysql_cb/mysql_cb_log.h
new file mode 100644
index 0000000..dc56330
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_log.h
@@ -0,0 +1,22 @@
+// Copyright (C) 2019-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef LEASE_CMD_LOG_H
+#define LEASE_CMD_LOG_H
+
+#include <log/logger_support.h>
+#include <log/macros.h>
+#include <mysql_cb_messages.h>
+
+namespace isc {
+namespace dhcp {
+
+extern isc::log::Logger mysql_cb_logger;
+
+}  // namespace dhcp
+}  // namespace isc
+
+#endif
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_messages.cc b/src/hooks/dhcp/mysql_cb/mysql_cb_messages.cc
new file mode 100644
index 0000000..00a8dde
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_messages.cc
@@ -0,0 +1,405 @@
+// File created from ../../../../src/hooks/dhcp/mysql_cb/mysql_cb_messages.mes
+
+#include <cstddef>
+#include <log/message_types.h>
+#include <log/message_initializer.h>
+
+namespace isc {
+namespace cb {
+
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4 = "MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6 = "MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6 = "MYSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4 = "MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6 = "MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS4 = "MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS4";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS6 = "MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS6";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4 = "MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6 = "MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_OPTION4 = "MYSQL_CB_CREATE_UPDATE_OPTION4";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_OPTION6 = "MYSQL_CB_CREATE_UPDATE_OPTION6";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_OPTION_DEF4 = "MYSQL_CB_CREATE_UPDATE_OPTION_DEF4";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_OPTION_DEF6 = "MYSQL_CB_CREATE_UPDATE_OPTION_DEF6";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SERVER4 = "MYSQL_CB_CREATE_UPDATE_SERVER4";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SERVER6 = "MYSQL_CB_CREATE_UPDATE_SERVER6";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK4 = "MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK4";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK6 = "MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK6";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4 = "MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6 = "MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SUBNET4 = "MYSQL_CB_CREATE_UPDATE_SUBNET4";
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SUBNET6 = "MYSQL_CB_CREATE_UPDATE_SUBNET6";
+extern const isc::log::MessageID MYSQL_CB_DEINIT_OK = "MYSQL_CB_DEINIT_OK";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4 = "MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT = "MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6 = "MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT = "MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4 = "MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT = "MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6 = "MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT = "MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_OPTION_DEFS4 = "MYSQL_CB_DELETE_ALL_OPTION_DEFS4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT = "MYSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_OPTION_DEFS6 = "MYSQL_CB_DELETE_ALL_OPTION_DEFS6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT = "MYSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SERVERS4 = "MYSQL_CB_DELETE_ALL_SERVERS4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SERVERS4_RESULT = "MYSQL_CB_DELETE_ALL_SERVERS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SERVERS6 = "MYSQL_CB_DELETE_ALL_SERVERS6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SERVERS6_RESULT = "MYSQL_CB_DELETE_ALL_SERVERS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4 = "MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT = "MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6 = "MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT = "MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SUBNETS4 = "MYSQL_CB_DELETE_ALL_SUBNETS4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SUBNETS4_RESULT = "MYSQL_CB_DELETE_ALL_SUBNETS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SUBNETS6 = "MYSQL_CB_DELETE_ALL_SUBNETS6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SUBNETS6_RESULT = "MYSQL_CB_DELETE_ALL_SUBNETS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_OPTION4 = "MYSQL_CB_DELETE_BY_POOL_OPTION4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_OPTION4_RESULT = "MYSQL_CB_DELETE_BY_POOL_OPTION4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_OPTION6 = "MYSQL_CB_DELETE_BY_POOL_OPTION6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_OPTION6_RESULT = "MYSQL_CB_DELETE_BY_POOL_OPTION6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6 = "MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT = "MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_PREFIX_SUBNET4 = "MYSQL_CB_DELETE_BY_PREFIX_SUBNET4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT = "MYSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_PREFIX_SUBNET6 = "MYSQL_CB_DELETE_BY_PREFIX_SUBNET6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT = "MYSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4 = "MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT = "MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6 = "MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT = "MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4 = "MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT = "MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6 = "MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT = "MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_CLIENT_CLASS4 = "MYSQL_CB_DELETE_CLIENT_CLASS4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_CLIENT_CLASS4_RESULT = "MYSQL_CB_DELETE_CLIENT_CLASS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_CLIENT_CLASS6 = "MYSQL_CB_DELETE_CLIENT_CLASS6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_CLIENT_CLASS6_RESULT = "MYSQL_CB_DELETE_CLIENT_CLASS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_GLOBAL_PARAMETER4 = "MYSQL_CB_DELETE_GLOBAL_PARAMETER4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT = "MYSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_GLOBAL_PARAMETER6 = "MYSQL_CB_DELETE_GLOBAL_PARAMETER6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT = "MYSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION4 = "MYSQL_CB_DELETE_OPTION4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION4_RESULT = "MYSQL_CB_DELETE_OPTION4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION6 = "MYSQL_CB_DELETE_OPTION6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION6_RESULT = "MYSQL_CB_DELETE_OPTION6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION_DEF4 = "MYSQL_CB_DELETE_OPTION_DEF4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION_DEF4_RESULT = "MYSQL_CB_DELETE_OPTION_DEF4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION_DEF6 = "MYSQL_CB_DELETE_OPTION_DEF6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION_DEF6_RESULT = "MYSQL_CB_DELETE_OPTION_DEF6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SERVER4 = "MYSQL_CB_DELETE_SERVER4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SERVER4_RESULT = "MYSQL_CB_DELETE_SERVER4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SERVER6 = "MYSQL_CB_DELETE_SERVER6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SERVER6_RESULT = "MYSQL_CB_DELETE_SERVER6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK4 = "MYSQL_CB_DELETE_SHARED_NETWORK4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK4_RESULT = "MYSQL_CB_DELETE_SHARED_NETWORK4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK6 = "MYSQL_CB_DELETE_SHARED_NETWORK6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK6_RESULT = "MYSQL_CB_DELETE_SHARED_NETWORK6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4 = "MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT = "MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6 = "MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT = "MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4 = "MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT = "MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6 = "MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6";
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT = "MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_CLIENT_CLASSES4 = "MYSQL_CB_GET_ALL_CLIENT_CLASSES4";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT = "MYSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_CLIENT_CLASSES6 = "MYSQL_CB_GET_ALL_CLIENT_CLASSES6";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT = "MYSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4 = "MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT = "MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6 = "MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT = "MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTIONS4 = "MYSQL_CB_GET_ALL_OPTIONS4";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTIONS4_RESULT = "MYSQL_CB_GET_ALL_OPTIONS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTIONS6 = "MYSQL_CB_GET_ALL_OPTIONS6";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTIONS6_RESULT = "MYSQL_CB_GET_ALL_OPTIONS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTION_DEFS4 = "MYSQL_CB_GET_ALL_OPTION_DEFS4";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTION_DEFS4_RESULT = "MYSQL_CB_GET_ALL_OPTION_DEFS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTION_DEFS6 = "MYSQL_CB_GET_ALL_OPTION_DEFS6";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTION_DEFS6_RESULT = "MYSQL_CB_GET_ALL_OPTION_DEFS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SERVERS4 = "MYSQL_CB_GET_ALL_SERVERS4";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SERVERS4_RESULT = "MYSQL_CB_GET_ALL_SERVERS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SERVERS6 = "MYSQL_CB_GET_ALL_SERVERS6";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SERVERS6_RESULT = "MYSQL_CB_GET_ALL_SERVERS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SHARED_NETWORKS4 = "MYSQL_CB_GET_ALL_SHARED_NETWORKS4";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT = "MYSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SHARED_NETWORKS6 = "MYSQL_CB_GET_ALL_SHARED_NETWORKS6";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT = "MYSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SUBNETS4 = "MYSQL_CB_GET_ALL_SUBNETS4";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SUBNETS4_RESULT = "MYSQL_CB_GET_ALL_SUBNETS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SUBNETS6 = "MYSQL_CB_GET_ALL_SUBNETS6";
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SUBNETS6_RESULT = "MYSQL_CB_GET_ALL_SUBNETS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_CLIENT_CLASS4 = "MYSQL_CB_GET_CLIENT_CLASS4";
+extern const isc::log::MessageID MYSQL_CB_GET_CLIENT_CLASS6 = "MYSQL_CB_GET_CLIENT_CLASS6";
+extern const isc::log::MessageID MYSQL_CB_GET_GLOBAL_PARAMETER4 = "MYSQL_CB_GET_GLOBAL_PARAMETER4";
+extern const isc::log::MessageID MYSQL_CB_GET_GLOBAL_PARAMETER6 = "MYSQL_CB_GET_GLOBAL_PARAMETER6";
+extern const isc::log::MessageID MYSQL_CB_GET_HOST4 = "MYSQL_CB_GET_HOST4";
+extern const isc::log::MessageID MYSQL_CB_GET_HOST6 = "MYSQL_CB_GET_HOST6";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4 = "MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT = "MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6 = "MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT = "MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4 = "MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT = "MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6 = "MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT = "MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTIONS4 = "MYSQL_CB_GET_MODIFIED_OPTIONS4";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTIONS4_RESULT = "MYSQL_CB_GET_MODIFIED_OPTIONS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTIONS6 = "MYSQL_CB_GET_MODIFIED_OPTIONS6";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTIONS6_RESULT = "MYSQL_CB_GET_MODIFIED_OPTIONS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTION_DEFS4 = "MYSQL_CB_GET_MODIFIED_OPTION_DEFS4";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT = "MYSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTION_DEFS6 = "MYSQL_CB_GET_MODIFIED_OPTION_DEFS6";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT = "MYSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4 = "MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT = "MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6 = "MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT = "MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SUBNETS4 = "MYSQL_CB_GET_MODIFIED_SUBNETS4";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SUBNETS4_RESULT = "MYSQL_CB_GET_MODIFIED_SUBNETS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SUBNETS6 = "MYSQL_CB_GET_MODIFIED_SUBNETS6";
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SUBNETS6_RESULT = "MYSQL_CB_GET_MODIFIED_SUBNETS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_OPTION4 = "MYSQL_CB_GET_OPTION4";
+extern const isc::log::MessageID MYSQL_CB_GET_OPTION6 = "MYSQL_CB_GET_OPTION6";
+extern const isc::log::MessageID MYSQL_CB_GET_OPTION_DEF4 = "MYSQL_CB_GET_OPTION_DEF4";
+extern const isc::log::MessageID MYSQL_CB_GET_OPTION_DEF6 = "MYSQL_CB_GET_OPTION_DEF6";
+extern const isc::log::MessageID MYSQL_CB_GET_PORT4 = "MYSQL_CB_GET_PORT4";
+extern const isc::log::MessageID MYSQL_CB_GET_PORT6 = "MYSQL_CB_GET_PORT6";
+extern const isc::log::MessageID MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4 = "MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4";
+extern const isc::log::MessageID MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT = "MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6 = "MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6";
+extern const isc::log::MessageID MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT = "MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_SERVER4 = "MYSQL_CB_GET_SERVER4";
+extern const isc::log::MessageID MYSQL_CB_GET_SERVER6 = "MYSQL_CB_GET_SERVER6";
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK4 = "MYSQL_CB_GET_SHARED_NETWORK4";
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK6 = "MYSQL_CB_GET_SHARED_NETWORK6";
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4 = "MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4";
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT = "MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6 = "MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6";
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT = "MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT";
+extern const isc::log::MessageID MYSQL_CB_GET_SUBNET4_BY_PREFIX = "MYSQL_CB_GET_SUBNET4_BY_PREFIX";
+extern const isc::log::MessageID MYSQL_CB_GET_SUBNET4_BY_SUBNET_ID = "MYSQL_CB_GET_SUBNET4_BY_SUBNET_ID";
+extern const isc::log::MessageID MYSQL_CB_GET_SUBNET6_BY_PREFIX = "MYSQL_CB_GET_SUBNET6_BY_PREFIX";
+extern const isc::log::MessageID MYSQL_CB_GET_SUBNET6_BY_SUBNET_ID = "MYSQL_CB_GET_SUBNET6_BY_SUBNET_ID";
+extern const isc::log::MessageID MYSQL_CB_GET_TYPE4 = "MYSQL_CB_GET_TYPE4";
+extern const isc::log::MessageID MYSQL_CB_GET_TYPE6 = "MYSQL_CB_GET_TYPE6";
+extern const isc::log::MessageID MYSQL_CB_INIT_OK = "MYSQL_CB_INIT_OK";
+extern const isc::log::MessageID MYSQL_CB_NO_TLS = "MYSQL_CB_NO_TLS";
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_ATTEMPT_FAILED4 = "MYSQL_CB_RECONNECT_ATTEMPT_FAILED4";
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_ATTEMPT_FAILED6 = "MYSQL_CB_RECONNECT_ATTEMPT_FAILED6";
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4 = "MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4";
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6 = "MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6";
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_FAILED4 = "MYSQL_CB_RECONNECT_FAILED4";
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_FAILED6 = "MYSQL_CB_RECONNECT_FAILED6";
+extern const isc::log::MessageID MYSQL_CB_REGISTER_BACKEND_TYPE4 = "MYSQL_CB_REGISTER_BACKEND_TYPE4";
+extern const isc::log::MessageID MYSQL_CB_REGISTER_BACKEND_TYPE6 = "MYSQL_CB_REGISTER_BACKEND_TYPE6";
+extern const isc::log::MessageID MYSQL_CB_TLS_CIPHER = "MYSQL_CB_TLS_CIPHER";
+extern const isc::log::MessageID MYSQL_CB_UNREGISTER_BACKEND_TYPE4 = "MYSQL_CB_UNREGISTER_BACKEND_TYPE4";
+extern const isc::log::MessageID MYSQL_CB_UNREGISTER_BACKEND_TYPE6 = "MYSQL_CB_UNREGISTER_BACKEND_TYPE6";
+
+} // namespace cb
+} // namespace isc
+
+namespace {
+
+const char* values[] = {
+    "MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4", "create or update option pool start: %1 pool end: %2",
+    "MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6", "create or update option pool start: %1 pool end: %2",
+    "MYSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6", "create or update option prefix: %1 prefix len: %2",
+    "MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4", "create or update option by subnet id: %1",
+    "MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6", "create or update option by subnet id: %1",
+    "MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS4", "create or update client class: %1",
+    "MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS6", "create or update client class: %1",
+    "MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4", "create or update global parameter: %1",
+    "MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6", "create or update global parameter: %1",
+    "MYSQL_CB_CREATE_UPDATE_OPTION4", "create or update option",
+    "MYSQL_CB_CREATE_UPDATE_OPTION6", "create or update option",
+    "MYSQL_CB_CREATE_UPDATE_OPTION_DEF4", "create or update option definition: %1 code: %2",
+    "MYSQL_CB_CREATE_UPDATE_OPTION_DEF6", "create or update option definition: %1 code: %2",
+    "MYSQL_CB_CREATE_UPDATE_SERVER4", "create or update server: %1",
+    "MYSQL_CB_CREATE_UPDATE_SERVER6", "create or update server: %1",
+    "MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK4", "create or update shared network: %1",
+    "MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK6", "create or update shared network: %1",
+    "MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4", "create or update shared network: %1 option",
+    "MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6", "create or update shared network: %1 option",
+    "MYSQL_CB_CREATE_UPDATE_SUBNET4", "create or update subnet: %1",
+    "MYSQL_CB_CREATE_UPDATE_SUBNET6", "create or update subnet: %1",
+    "MYSQL_CB_DEINIT_OK", "unloading MYSQL CB hooks library successful",
+    "MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4", "delete all client classes",
+    "MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6", "delete all client classes",
+    "MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4", "delete all global parameters",
+    "MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6", "delete all global parameters",
+    "MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_ALL_OPTION_DEFS4", "delete all option definitions",
+    "MYSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_ALL_OPTION_DEFS6", "delete all option definitions",
+    "MYSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_ALL_SERVERS4", "delete all DHCPv4 servers",
+    "MYSQL_CB_DELETE_ALL_SERVERS4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_ALL_SERVERS6", "delete all DHCPv6 servers",
+    "MYSQL_CB_DELETE_ALL_SERVERS6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4", "delete all shared networks",
+    "MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6", "delete all shared networks",
+    "MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_ALL_SUBNETS4", "delete all subnets",
+    "MYSQL_CB_DELETE_ALL_SUBNETS4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_ALL_SUBNETS6", "delete all subnets",
+    "MYSQL_CB_DELETE_ALL_SUBNETS6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_BY_POOL_OPTION4", "delete pool start: %1 pool end: %2 option code: %3 space: %4",
+    "MYSQL_CB_DELETE_BY_POOL_OPTION4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_BY_POOL_OPTION6", "delete pool start: %1 pool end: %2 option code: %3 space: %4",
+    "MYSQL_CB_DELETE_BY_POOL_OPTION6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6", "delete prefix: %1 prefix len: %2 option code: %3 space: %4",
+    "MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_BY_PREFIX_SUBNET4", "delete subnet by prefix: %1",
+    "MYSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_BY_PREFIX_SUBNET6", "delete subnet by prefix: %1",
+    "MYSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4", "delete by subnet id: %1 option code: %2 space: %3",
+    "MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6", "delete by subnet id: %1 option code: %2 space: %3",
+    "MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4", "delete subnet by subnet id: %1",
+    "MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6", "delete subnet by subnet id: %1",
+    "MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_CLIENT_CLASS4", "delete client class: %1",
+    "MYSQL_CB_DELETE_CLIENT_CLASS4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_CLIENT_CLASS6", "delete client class: %1",
+    "MYSQL_CB_DELETE_CLIENT_CLASS6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_GLOBAL_PARAMETER4", "delete global parameter: %1",
+    "MYSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_GLOBAL_PARAMETER6", "delete global parameter: %1",
+    "MYSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_OPTION4", "delete option code: %1 space: %2",
+    "MYSQL_CB_DELETE_OPTION4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_OPTION6", "delete option code: %1 space: %2",
+    "MYSQL_CB_DELETE_OPTION6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_OPTION_DEF4", "delete option definition code: %1 space: %2",
+    "MYSQL_CB_DELETE_OPTION_DEF4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_OPTION_DEF6", "delete option definition code: %1 space: %2",
+    "MYSQL_CB_DELETE_OPTION_DEF6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_SERVER4", "delete DHCPv4 server: %1",
+    "MYSQL_CB_DELETE_SERVER4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_SERVER6", "delete DHCPv6 server: %1",
+    "MYSQL_CB_DELETE_SERVER6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_SHARED_NETWORK4", "delete shared network: %1",
+    "MYSQL_CB_DELETE_SHARED_NETWORK4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_SHARED_NETWORK6", "delete shared network: %1",
+    "MYSQL_CB_DELETE_SHARED_NETWORK6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4", "delete shared network: %1 option code: %2 space: %3",
+    "MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6", "delete shared network: %1 option code: %2 space: %3",
+    "MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4", "delete shared network: %1 subnets",
+    "MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6", "delete shared network: %1 subnets",
+    "MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT", "deleted: %1 entries",
+    "MYSQL_CB_GET_ALL_CLIENT_CLASSES4", "retrieving all client classes",
+    "MYSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_CLIENT_CLASSES6", "retrieving all client classes",
+    "MYSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4", "retrieving all global parameters",
+    "MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6", "retrieving all global parameters",
+    "MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_OPTIONS4", "retrieving all options",
+    "MYSQL_CB_GET_ALL_OPTIONS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_OPTIONS6", "retrieving all options",
+    "MYSQL_CB_GET_ALL_OPTIONS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_OPTION_DEFS4", "retrieving all option definitions",
+    "MYSQL_CB_GET_ALL_OPTION_DEFS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_OPTION_DEFS6", "retrieving all option definitions",
+    "MYSQL_CB_GET_ALL_OPTION_DEFS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_SERVERS4", "retrieving all servers",
+    "MYSQL_CB_GET_ALL_SERVERS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_SERVERS6", "retrieving all DHCPv6 servers",
+    "MYSQL_CB_GET_ALL_SERVERS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_SHARED_NETWORKS4", "retrieving all shared networks",
+    "MYSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_SHARED_NETWORKS6", "retrieving all shared networks",
+    "MYSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_SUBNETS4", "retrieving all subnets",
+    "MYSQL_CB_GET_ALL_SUBNETS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_ALL_SUBNETS6", "retrieving all subnets",
+    "MYSQL_CB_GET_ALL_SUBNETS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_CLIENT_CLASS4", "retrieving client class: %1",
+    "MYSQL_CB_GET_CLIENT_CLASS6", "retrieving client class: %1",
+    "MYSQL_CB_GET_GLOBAL_PARAMETER4", "retrieving global parameter: %1",
+    "MYSQL_CB_GET_GLOBAL_PARAMETER6", "retrieving global parameter: %1",
+    "MYSQL_CB_GET_HOST4", "get host",
+    "MYSQL_CB_GET_HOST6", "get host",
+    "MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4", "retrieving modified client classes from: %1",
+    "MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6", "retrieving modified client classes from: %1",
+    "MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4", "retrieving modified global parameters from: %1",
+    "MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6", "retrieving modified global parameters from: %1",
+    "MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_MODIFIED_OPTIONS4", "retrieving modified options from: %1",
+    "MYSQL_CB_GET_MODIFIED_OPTIONS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_MODIFIED_OPTIONS6", "retrieving modified options from: %1",
+    "MYSQL_CB_GET_MODIFIED_OPTIONS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_MODIFIED_OPTION_DEFS4", "retrieving modified option definitions from: %1",
+    "MYSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_MODIFIED_OPTION_DEFS6", "retrieving modified option definitions from: %1",
+    "MYSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4", "retrieving modified shared networks from: %1",
+    "MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6", "retrieving modified shared networks from: %1",
+    "MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_MODIFIED_SUBNETS4", "retrieving modified subnets from: %1",
+    "MYSQL_CB_GET_MODIFIED_SUBNETS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_MODIFIED_SUBNETS6", "retrieving modified subnets from: %1",
+    "MYSQL_CB_GET_MODIFIED_SUBNETS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_OPTION4", "retrieving option code: %1 space: %2",
+    "MYSQL_CB_GET_OPTION6", "retrieving option code: %1 space: %2",
+    "MYSQL_CB_GET_OPTION_DEF4", "retrieving option definition code: %1 space: %2",
+    "MYSQL_CB_GET_OPTION_DEF6", "retrieving option definition code: %1 space: %2",
+    "MYSQL_CB_GET_PORT4", "get port",
+    "MYSQL_CB_GET_PORT6", "get port",
+    "MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4", "retrieving audit entries from: %1 %2",
+    "MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6", "retrieving audit entries from: %1 %2",
+    "MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_SERVER4", "retrieving DHCPv4 server: %1",
+    "MYSQL_CB_GET_SERVER6", "retrieving DHCPv6 server: %1",
+    "MYSQL_CB_GET_SHARED_NETWORK4", "retrieving shared network: %1",
+    "MYSQL_CB_GET_SHARED_NETWORK6", "retrieving shared network: %1",
+    "MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4", "retrieving shared network: %1 subnets",
+    "MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6", "retrieving shared network: %1 subnets",
+    "MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT", "retrieving: %1 elements",
+    "MYSQL_CB_GET_SUBNET4_BY_PREFIX", "retrieving subnet by prefix: %1",
+    "MYSQL_CB_GET_SUBNET4_BY_SUBNET_ID", "retrieving subnet by subnet id: %1",
+    "MYSQL_CB_GET_SUBNET6_BY_PREFIX", "retrieving subnet by prefix: %1",
+    "MYSQL_CB_GET_SUBNET6_BY_SUBNET_ID", "retrieving subnet by subnet id: %1",
+    "MYSQL_CB_GET_TYPE4", "get type",
+    "MYSQL_CB_GET_TYPE6", "get type",
+    "MYSQL_CB_INIT_OK", "loading MYSQL CB hooks library successful",
+    "MYSQL_CB_NO_TLS", "TLS was required but is not used",
+    "MYSQL_CB_RECONNECT_ATTEMPT_FAILED4", "database reconnect failed: %1",
+    "MYSQL_CB_RECONNECT_ATTEMPT_FAILED6", "database reconnect failed: %1",
+    "MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4", "scheduling attempt %1 of %2 in %3 milliseconds",
+    "MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6", "scheduling attempt %1 of %2 in %3 milliseconds",
+    "MYSQL_CB_RECONNECT_FAILED4", "maximum number of database reconnect attempts: %1, has been exhausted without success",
+    "MYSQL_CB_RECONNECT_FAILED6", "maximum number of database reconnect attempts: %1, has been exhausted without success",
+    "MYSQL_CB_REGISTER_BACKEND_TYPE4", "register backend",
+    "MYSQL_CB_REGISTER_BACKEND_TYPE6", "register backend",
+    "MYSQL_CB_TLS_CIPHER", "TLS cipher: %1",
+    "MYSQL_CB_UNREGISTER_BACKEND_TYPE4", "unregister backend",
+    "MYSQL_CB_UNREGISTER_BACKEND_TYPE6", "unregister backend",
+    NULL
+};
+
+const isc::log::MessageInitializer initializer(values);
+
+} // Anonymous namespace
+
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_messages.h b/src/hooks/dhcp/mysql_cb/mysql_cb_messages.h
new file mode 100644
index 0000000..7b3b39d
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_messages.h
@@ -0,0 +1,206 @@
+// File created from ../../../../src/hooks/dhcp/mysql_cb/mysql_cb_messages.mes
+
+#ifndef MYSQL_CB_MESSAGES_H
+#define MYSQL_CB_MESSAGES_H
+
+#include <log/message_types.h>
+
+namespace isc {
+namespace cb {
+
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS4;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS6;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_OPTION4;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_OPTION6;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_OPTION_DEF4;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_OPTION_DEF6;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SERVER4;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SERVER6;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK4;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK6;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SUBNET4;
+extern const isc::log::MessageID MYSQL_CB_CREATE_UPDATE_SUBNET6;
+extern const isc::log::MessageID MYSQL_CB_DEINIT_OK;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_OPTION_DEFS4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_OPTION_DEFS6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SERVERS4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SERVERS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SERVERS6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SERVERS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SUBNETS4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SUBNETS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SUBNETS6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_ALL_SUBNETS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_OPTION4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_OPTION4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_OPTION6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_OPTION6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_PREFIX_SUBNET4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_PREFIX_SUBNET6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_CLIENT_CLASS4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_CLIENT_CLASS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_CLIENT_CLASS6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_CLIENT_CLASS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_GLOBAL_PARAMETER4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_GLOBAL_PARAMETER6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION_DEF4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION_DEF4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION_DEF6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_OPTION_DEF6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SERVER4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SERVER4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SERVER6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SERVER6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6;
+extern const isc::log::MessageID MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_CLIENT_CLASSES4;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_CLIENT_CLASSES6;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTIONS4;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTIONS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTIONS6;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTIONS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTION_DEFS4;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTION_DEFS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTION_DEFS6;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_OPTION_DEFS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SERVERS4;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SERVERS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SERVERS6;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SERVERS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SHARED_NETWORKS4;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SHARED_NETWORKS6;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SUBNETS4;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SUBNETS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SUBNETS6;
+extern const isc::log::MessageID MYSQL_CB_GET_ALL_SUBNETS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_CLIENT_CLASS4;
+extern const isc::log::MessageID MYSQL_CB_GET_CLIENT_CLASS6;
+extern const isc::log::MessageID MYSQL_CB_GET_GLOBAL_PARAMETER4;
+extern const isc::log::MessageID MYSQL_CB_GET_GLOBAL_PARAMETER6;
+extern const isc::log::MessageID MYSQL_CB_GET_HOST4;
+extern const isc::log::MessageID MYSQL_CB_GET_HOST6;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTIONS4;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTIONS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTIONS6;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTIONS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTION_DEFS4;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTION_DEFS6;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SUBNETS4;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SUBNETS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SUBNETS6;
+extern const isc::log::MessageID MYSQL_CB_GET_MODIFIED_SUBNETS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_OPTION4;
+extern const isc::log::MessageID MYSQL_CB_GET_OPTION6;
+extern const isc::log::MessageID MYSQL_CB_GET_OPTION_DEF4;
+extern const isc::log::MessageID MYSQL_CB_GET_OPTION_DEF6;
+extern const isc::log::MessageID MYSQL_CB_GET_PORT4;
+extern const isc::log::MessageID MYSQL_CB_GET_PORT6;
+extern const isc::log::MessageID MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4;
+extern const isc::log::MessageID MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6;
+extern const isc::log::MessageID MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_SERVER4;
+extern const isc::log::MessageID MYSQL_CB_GET_SERVER6;
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK4;
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK6;
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4;
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6;
+extern const isc::log::MessageID MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT;
+extern const isc::log::MessageID MYSQL_CB_GET_SUBNET4_BY_PREFIX;
+extern const isc::log::MessageID MYSQL_CB_GET_SUBNET4_BY_SUBNET_ID;
+extern const isc::log::MessageID MYSQL_CB_GET_SUBNET6_BY_PREFIX;
+extern const isc::log::MessageID MYSQL_CB_GET_SUBNET6_BY_SUBNET_ID;
+extern const isc::log::MessageID MYSQL_CB_GET_TYPE4;
+extern const isc::log::MessageID MYSQL_CB_GET_TYPE6;
+extern const isc::log::MessageID MYSQL_CB_INIT_OK;
+extern const isc::log::MessageID MYSQL_CB_NO_TLS;
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_ATTEMPT_FAILED4;
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_ATTEMPT_FAILED6;
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4;
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6;
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_FAILED4;
+extern const isc::log::MessageID MYSQL_CB_RECONNECT_FAILED6;
+extern const isc::log::MessageID MYSQL_CB_REGISTER_BACKEND_TYPE4;
+extern const isc::log::MessageID MYSQL_CB_REGISTER_BACKEND_TYPE6;
+extern const isc::log::MessageID MYSQL_CB_TLS_CIPHER;
+extern const isc::log::MessageID MYSQL_CB_UNREGISTER_BACKEND_TYPE4;
+extern const isc::log::MessageID MYSQL_CB_UNREGISTER_BACKEND_TYPE6;
+
+} // namespace cb
+} // namespace isc
+
+#endif // MYSQL_CB_MESSAGES_H
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_messages.mes b/src/hooks/dhcp/mysql_cb/mysql_cb_messages.mes
new file mode 100644
index 0000000..6272298
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_messages.mes
@@ -0,0 +1,592 @@
+# Copyright (C) 2018-2023 Internet Systems Consortium, Inc. ("ISC")
+
+$NAMESPACE isc::cb
+
+% MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4 create or update option pool start: %1 pool end: %2
+Debug message issued when triggered an action to create or update option by pool
+
+% MYSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6 create or update option pool start: %1 pool end: %2
+Debug message issued when triggered an action to create or update option by pool
+
+% MYSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6 create or update option prefix: %1 prefix len: %2
+Debug message issued when triggered an action to create or update option by prefix
+
+% MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4 create or update option by subnet id: %1
+Debug message issued when triggered an action to create or update option by subnet id
+
+% MYSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6 create or update option by subnet id: %1
+Debug message issued when triggered an action to create or update option by subnet id
+
+% MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS4 create or update client class: %1
+Debug message issued when triggered an action to create or update client class
+
+% MYSQL_CB_CREATE_UPDATE_CLIENT_CLASS6 create or update client class: %1
+Debug message issued when triggered an action to create or update client class
+
+% MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4 create or update global parameter: %1
+Debug message issued when triggered an action to create or update global parameter
+
+% MYSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6 create or update global parameter: %1
+Debug message issued when triggered an action to create or update global parameter
+
+% MYSQL_CB_CREATE_UPDATE_OPTION4 create or update option
+Debug message issued when triggered an action to create or update option
+
+% MYSQL_CB_CREATE_UPDATE_OPTION6 create or update option
+Debug message issued when triggered an action to create or update option
+
+% MYSQL_CB_CREATE_UPDATE_OPTION_DEF4 create or update option definition: %1 code: %2
+Debug message issued when triggered an action to create or update option definition
+
+% MYSQL_CB_CREATE_UPDATE_OPTION_DEF6 create or update option definition: %1 code: %2
+Debug message issued when triggered an action to create or update option definition
+
+% MYSQL_CB_CREATE_UPDATE_SERVER4 create or update server: %1
+Debug message issued when triggered an action to create or update a DHCPv4
+server information.
+
+% MYSQL_CB_CREATE_UPDATE_SERVER6 create or update server: %1
+Debug message issued when triggered an action to create or update a DHCPv6
+server information.
+
+% MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK4 create or update shared network: %1
+Debug message issued when triggered an action to create or update shared network
+
+% MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK6 create or update shared network: %1
+Debug message issued when triggered an action to create or update shared network
+
+% MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4 create or update shared network: %1 option
+Debug message issued when triggered an action to create or update shared network option
+
+% MYSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6 create or update shared network: %1 option
+Debug message issued when triggered an action to create or update shared network option
+
+% MYSQL_CB_CREATE_UPDATE_SUBNET4 create or update subnet: %1
+Debug message issued when triggered an action to create or update subnet
+
+% MYSQL_CB_CREATE_UPDATE_SUBNET6 create or update subnet: %1
+Debug message issued when triggered an action to create or update subnet
+
+% MYSQL_CB_DEINIT_OK unloading MYSQL CB hooks library successful
+This informational message indicates that the MySQL Configuration Backend hooks
+library has been unloaded successfully.
+
+% MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4 delete all client classes
+Debug message issued when triggered an action to delete all client classes
+
+% MYSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all client classes
+
+% MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6 delete all client classes
+Debug message issued when triggered an action to delete all client classes
+
+% MYSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all client classes
+
+% MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4 delete all global parameters
+Debug message issued when triggered an action to delete all global parameters
+
+% MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all global parameters
+
+% MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6 delete all global parameters
+Debug message issued when triggered an action to delete all global parameters
+
+% MYSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all global parameters
+
+% MYSQL_CB_DELETE_ALL_OPTION_DEFS4 delete all option definitions
+Debug message issued when triggered an action to delete all option definitions
+
+% MYSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all option definitions
+
+% MYSQL_CB_DELETE_ALL_OPTION_DEFS6 delete all option definitions
+Debug message issued when triggered an action to delete all option definitions
+
+% MYSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all option definitions
+
+% MYSQL_CB_DELETE_ALL_SERVERS4 delete all DHCPv4 servers
+Debug message issued when triggered an action to delete all servers.
+
+% MYSQL_CB_DELETE_ALL_SERVERS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all servers.
+
+% MYSQL_CB_DELETE_ALL_SERVERS6 delete all DHCPv6 servers
+Debug message issued when triggered an action to delete all servers.
+
+% MYSQL_CB_DELETE_ALL_SERVERS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all servers.
+
+% MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4 delete all shared networks
+Debug message issued when triggered an action to delete all shared networks
+
+% MYSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all shared networks
+
+% MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6 delete all shared networks
+Debug message issued when triggered an action to delete all shared networks
+
+% MYSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all shared networks
+
+% MYSQL_CB_DELETE_ALL_SUBNETS4 delete all subnets
+Debug message issued when triggered an action to delete all subnets
+
+% MYSQL_CB_DELETE_ALL_SUBNETS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all subnets
+
+% MYSQL_CB_DELETE_ALL_SUBNETS6 delete all subnets
+Debug message issued when triggered an action to delete all subnets
+
+% MYSQL_CB_DELETE_ALL_SUBNETS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all subnets
+
+% MYSQL_CB_DELETE_BY_POOL_OPTION4 delete pool start: %1 pool end: %2 option code: %3 space: %4
+Debug message issued when triggered an action to delete option by pool
+
+% MYSQL_CB_DELETE_BY_POOL_OPTION4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option by pool
+
+% MYSQL_CB_DELETE_BY_POOL_OPTION6 delete pool start: %1 pool end: %2 option code: %3 space: %4
+Debug message issued when triggered an action to delete option by pool
+
+% MYSQL_CB_DELETE_BY_POOL_OPTION6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option by pool
+
+% MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6 delete prefix: %1 prefix len: %2 option code: %3 space: %4
+Debug message issued when triggered an action to delete option by prefix
+
+% MYSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option by prefix
+
+% MYSQL_CB_DELETE_BY_PREFIX_SUBNET4 delete subnet by prefix: %1
+Debug message issued when triggered an action to delete subnet by prefix
+
+% MYSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete subnet by prefix
+
+% MYSQL_CB_DELETE_BY_PREFIX_SUBNET6 delete subnet by prefix: %1
+Debug message issued when triggered an action to delete subnet by prefix
+
+% MYSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete subnet by prefix
+
+% MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4 delete by subnet id: %1 option code: %2 space: %3
+Debug message issued when triggered an action to delete option by subnet id
+
+% MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option by subnet id
+
+% MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6 delete by subnet id: %1 option code: %2 space: %3
+Debug message issued when triggered an action to delete option by subnet id
+
+% MYSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option by subnet id
+
+% MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4 delete subnet by subnet id: %1
+Debug message issued when triggered an action to delete subnet by subnet id
+
+% MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete subnet by subnet id
+
+% MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6 delete subnet by subnet id: %1
+Debug message issued when triggered an action to delete subnet by subnet id
+
+% MYSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete subnet by subnet id
+
+% MYSQL_CB_DELETE_CLIENT_CLASS4 delete client class: %1
+Debug message issued when triggered an action to delete client class
+
+% MYSQL_CB_DELETE_CLIENT_CLASS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete client class
+
+% MYSQL_CB_DELETE_CLIENT_CLASS6 delete client class: %1
+Debug message issued when triggered an action to delete client class
+
+% MYSQL_CB_DELETE_CLIENT_CLASS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete client class
+
+% MYSQL_CB_DELETE_GLOBAL_PARAMETER4 delete global parameter: %1
+Debug message issued when triggered an action to delete global parameter
+
+% MYSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete global parameter
+
+% MYSQL_CB_DELETE_GLOBAL_PARAMETER6 delete global parameter: %1
+Debug message issued when triggered an action to delete global parameter
+
+% MYSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete global parameter
+
+% MYSQL_CB_DELETE_OPTION4 delete option code: %1 space: %2
+Debug message issued when triggered an action to delete option
+
+% MYSQL_CB_DELETE_OPTION4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option
+
+% MYSQL_CB_DELETE_OPTION6 delete option code: %1 space: %2
+Debug message issued when triggered an action to delete option
+
+% MYSQL_CB_DELETE_OPTION6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option
+
+% MYSQL_CB_DELETE_OPTION_DEF4 delete option definition code: %1 space: %2
+Debug message issued when triggered an action to delete option definition
+
+% MYSQL_CB_DELETE_OPTION_DEF4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option definition
+
+% MYSQL_CB_DELETE_OPTION_DEF6 delete option definition code: %1 space: %2
+Debug message issued when triggered an action to delete option definition
+
+% MYSQL_CB_DELETE_OPTION_DEF6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option definition
+
+% MYSQL_CB_DELETE_SERVER4 delete DHCPv4 server: %1
+Debug message issued when triggered an action to delete a server.
+
+% MYSQL_CB_DELETE_SERVER4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete a server.
+
+% MYSQL_CB_DELETE_SERVER6 delete DHCPv6 server: %1
+Debug message issued when triggered an action to delete a server.
+
+% MYSQL_CB_DELETE_SERVER6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete a server.
+
+% MYSQL_CB_DELETE_SHARED_NETWORK4 delete shared network: %1
+Debug message issued when triggered an action to delete shared network
+
+% MYSQL_CB_DELETE_SHARED_NETWORK4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network
+
+% MYSQL_CB_DELETE_SHARED_NETWORK6 delete shared network: %1
+Debug message issued when triggered an action to delete shared network
+
+% MYSQL_CB_DELETE_SHARED_NETWORK6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network
+
+% MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4 delete shared network: %1 option code: %2 space: %3
+Debug message issued when triggered an action to delete shared network option
+
+% MYSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network option
+
+% MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6 delete shared network: %1 option code: %2 space: %3
+Debug message issued when triggered an action to delete shared network option
+
+% MYSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network option
+
+% MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4 delete shared network: %1 subnets
+Debug message issued when triggered an action to delete shared network subnets
+
+% MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network subnets
+
+% MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6 delete shared network: %1 subnets
+Debug message issued when triggered an action to delete shared network subnets
+
+% MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network subnets
+
+% MYSQL_CB_GET_ALL_CLIENT_CLASSES4 retrieving all client classes
+Debug message issued when triggered an action to retrieve all client classes
+
+% MYSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all client classes
+
+% MYSQL_CB_GET_ALL_CLIENT_CLASSES6 retrieving all client classes
+Debug message issued when triggered an action to retrieve all client classes
+
+% MYSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all client classes
+
+% MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4 retrieving all global parameters
+Debug message issued when triggered an action to retrieve all global parameters
+
+% MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all global parameters
+
+% MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6 retrieving all global parameters
+Debug message issued when triggered an action to retrieve all global parameters
+
+% MYSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all global parameters
+
+% MYSQL_CB_GET_ALL_OPTIONS4 retrieving all options
+Debug message issued when triggered an action to retrieve all options
+
+% MYSQL_CB_GET_ALL_OPTIONS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all options
+
+% MYSQL_CB_GET_ALL_OPTIONS6 retrieving all options
+Debug message issued when triggered an action to retrieve all options
+
+% MYSQL_CB_GET_ALL_OPTIONS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all options
+
+% MYSQL_CB_GET_ALL_OPTION_DEFS4 retrieving all option definitions
+Debug message issued when triggered an action to retrieve all option definitions
+
+% MYSQL_CB_GET_ALL_OPTION_DEFS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all option definitions
+
+% MYSQL_CB_GET_ALL_OPTION_DEFS6 retrieving all option definitions
+Debug message issued when triggered an action to retrieve all option definitions
+
+% MYSQL_CB_GET_ALL_OPTION_DEFS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all option definitions
+
+% MYSQL_CB_GET_ALL_SERVERS4 retrieving all servers
+Debug message issued when triggered an action to retrieve all DHCPv4
+servers
+
+% MYSQL_CB_GET_ALL_SERVERS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all DHCPv4
+servers
+
+% MYSQL_CB_GET_ALL_SERVERS6 retrieving all DHCPv6 servers
+Debug message issued when triggered an action to retrieve all DHCPv6
+servers
+
+% MYSQL_CB_GET_ALL_SERVERS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all DHCPv6
+servers
+
+% MYSQL_CB_GET_ALL_SHARED_NETWORKS4 retrieving all shared networks
+Debug message issued when triggered an action to retrieve all shared networks
+
+% MYSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all shared networks
+
+% MYSQL_CB_GET_ALL_SHARED_NETWORKS6 retrieving all shared networks
+Debug message issued when triggered an action to retrieve all shared networks
+
+% MYSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all shared networks
+
+% MYSQL_CB_GET_ALL_SUBNETS4 retrieving all subnets
+Debug message issued when triggered an action to retrieve all subnets
+
+% MYSQL_CB_GET_ALL_SUBNETS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all subnets
+
+% MYSQL_CB_GET_ALL_SUBNETS6 retrieving all subnets
+Debug message issued when triggered an action to retrieve all subnets
+
+% MYSQL_CB_GET_ALL_SUBNETS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all subnets
+
+% MYSQL_CB_GET_CLIENT_CLASS4 retrieving client class: %1
+Debug message issued when triggered an action to retrieve a client class
+
+% MYSQL_CB_GET_CLIENT_CLASS6 retrieving client class: %1
+Debug message issued when triggered an action to retrieve a client class
+
+% MYSQL_CB_GET_GLOBAL_PARAMETER4 retrieving global parameter: %1
+Debug message issued when triggered an action to retrieve global parameter
+
+% MYSQL_CB_GET_GLOBAL_PARAMETER6 retrieving global parameter: %1
+Debug message issued when triggered an action to retrieve global parameter
+
+% MYSQL_CB_GET_HOST4 get host
+Debug message issued when triggered an action to retrieve host
+
+% MYSQL_CB_GET_HOST6 get host
+Debug message issued when triggered an action to retrieve host
+
+% MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4 retrieving modified client classes from: %1
+Debug message issued when triggered an action to retrieve modified client classes from specified time
+
+% MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified client classes from specified time
+
+% MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6 retrieving modified client classes from: %1
+Debug message issued when triggered an action to retrieve modified client classes from specified time
+
+% MYSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified client classes from specified time
+
+% MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4 retrieving modified global parameters from: %1
+Debug message issued when triggered an action to retrieve modified global parameters from specified time
+
+% MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified global parameters from specified time
+
+% MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6 retrieving modified global parameters from: %1
+Debug message issued when triggered an action to retrieve modified global parameters from specified time
+
+% MYSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified global parameters from specified time
+
+% MYSQL_CB_GET_MODIFIED_OPTIONS4 retrieving modified options from: %1
+Debug message issued when triggered an action to retrieve modified options from specified time
+
+% MYSQL_CB_GET_MODIFIED_OPTIONS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified options from specified time
+
+% MYSQL_CB_GET_MODIFIED_OPTIONS6 retrieving modified options from: %1
+Debug message issued when triggered an action to retrieve modified options from specified time
+
+% MYSQL_CB_GET_MODIFIED_OPTIONS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified options from specified time
+
+% MYSQL_CB_GET_MODIFIED_OPTION_DEFS4 retrieving modified option definitions from: %1
+Debug message issued when triggered an action to retrieve modified option definitions from specified time
+
+% MYSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified option definitions from specified time
+
+% MYSQL_CB_GET_MODIFIED_OPTION_DEFS6 retrieving modified option definitions from: %1
+Debug message issued when triggered an action to retrieve modified option definitions from specified time
+
+% MYSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified option definitions from specified time
+
+% MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4 retrieving modified shared networks from: %1
+Debug message issued when triggered an action to retrieve modified shared networks from specified time
+
+% MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified shared networks from specified time
+
+% MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6 retrieving modified shared networks from: %1
+Debug message issued when triggered an action to retrieve modified shared networks from specified time
+
+% MYSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified shared networks from specified time
+
+% MYSQL_CB_GET_MODIFIED_SUBNETS4 retrieving modified subnets from: %1
+Debug message issued when triggered an action to retrieve modified subnets from specified time
+
+% MYSQL_CB_GET_MODIFIED_SUBNETS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified subnets from specified time
+
+% MYSQL_CB_GET_MODIFIED_SUBNETS6 retrieving modified subnets from: %1
+Debug message issued when triggered an action to retrieve modified subnets from specified time
+
+% MYSQL_CB_GET_MODIFIED_SUBNETS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified subnets from specified time
+
+% MYSQL_CB_GET_OPTION4 retrieving option code: %1 space: %2
+Debug message issued when triggered an action to retrieve option
+
+% MYSQL_CB_GET_OPTION6 retrieving option code: %1 space: %2
+Debug message issued when triggered an action to retrieve option
+
+% MYSQL_CB_GET_OPTION_DEF4 retrieving option definition code: %1 space: %2
+Debug message issued when triggered an action to retrieve option definition
+
+% MYSQL_CB_GET_OPTION_DEF6 retrieving option definition code: %1 space: %2
+Debug message issued when triggered an action to retrieve option definition
+
+% MYSQL_CB_GET_PORT4 get port
+Debug message issued when triggered an action to retrieve port
+
+% MYSQL_CB_GET_PORT6 get port
+Debug message issued when triggered an action to retrieve port
+
+% MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4 retrieving audit entries from: %1 %2
+Debug message issued when triggered an action to retrieve audit entries from specified time and id.
+
+% MYSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve audit entries from specified time
+
+% MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6 retrieving audit entries from: %1 %2
+Debug message issued when triggered an action to retrieve audit entries from specified time and id
+
+% MYSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve audit entries from specified time
+
+% MYSQL_CB_GET_SERVER4 retrieving DHCPv4 server: %1
+Debug message issued when triggered an action to retrieve a DHCPv4 server information.
+
+% MYSQL_CB_GET_SERVER6 retrieving DHCPv6 server: %1
+Debug message issued when triggered an action to retrieve a DHCPv6 server information.
+
+% MYSQL_CB_GET_SHARED_NETWORK4 retrieving shared network: %1
+Debug message issued when triggered an action to retrieve shared network
+
+% MYSQL_CB_GET_SHARED_NETWORK6 retrieving shared network: %1
+Debug message issued when triggered an action to retrieve shared network
+
+% MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4 retrieving shared network: %1 subnets
+Debug message issued when triggered an action to retrieve shared network subnets
+
+% MYSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve shared network subnets
+
+% MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6 retrieving shared network: %1 subnets
+Debug message issued when triggered an action to retrieve shared network subnets
+
+% MYSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve shared network subnets
+
+% MYSQL_CB_GET_SUBNET4_BY_PREFIX retrieving subnet by prefix: %1
+Debug message issued when triggered an action to retrieve subnet by prefix
+
+% MYSQL_CB_GET_SUBNET4_BY_SUBNET_ID retrieving subnet by subnet id: %1
+Debug message issued when triggered an action to retrieve subnet by subnet id
+
+% MYSQL_CB_GET_SUBNET6_BY_PREFIX retrieving subnet by prefix: %1
+Debug message issued when triggered an action to retrieve subnet by prefix
+
+% MYSQL_CB_GET_SUBNET6_BY_SUBNET_ID retrieving subnet by subnet id: %1
+Debug message issued when triggered an action to retrieve subnet by subnet id
+
+% MYSQL_CB_GET_TYPE4 get type
+Debug message issued when triggered an action to retrieve type
+
+% MYSQL_CB_GET_TYPE6 get type
+Debug message issued when triggered an action to retrieve type
+
+% MYSQL_CB_INIT_OK loading MYSQL CB hooks library successful
+This informational message indicates that the MySQL Configuration Backend hooks
+library has been loaded successfully. Enjoy!
+
+% MYSQL_CB_NO_TLS TLS was required but is not used
+This error message is issued when TLS for the connection was required but
+TLS is not used.
+
+% MYSQL_CB_RECONNECT_ATTEMPT_FAILED4 database reconnect failed: %1
+Error message issued when an attempt to reconnect has failed.
+
+% MYSQL_CB_RECONNECT_ATTEMPT_FAILED6 database reconnect failed: %1
+Error message issued when an attempt to reconnect has failed.
+
+% MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4 scheduling attempt %1 of %2 in %3 milliseconds
+Info message issued when the server is scheduling the next attempt to reconnect
+to the database.  This occurs when the server has lost database connectivity and
+is attempting to reconnect automatically.
+
+% MYSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6 scheduling attempt %1 of %2 in %3 milliseconds
+Info message issued when the server is scheduling the next attempt to reconnect
+to the database.  This occurs when the server has lost database connectivity and
+is attempting to reconnect automatically.
+
+% MYSQL_CB_RECONNECT_FAILED4 maximum number of database reconnect attempts: %1, has been exhausted without success
+Error message issued when the server failed to reconnect.  Loss of connectivity
+is typically a network or database server issue.
+
+% MYSQL_CB_RECONNECT_FAILED6 maximum number of database reconnect attempts: %1, has been exhausted without success
+Error message issued when the server failed to reconnect.  Loss of connectivity
+is typically a network or database server issue.
+
+% MYSQL_CB_REGISTER_BACKEND_TYPE4 register backend
+Debug message issued when triggered an action to register backend
+
+% MYSQL_CB_REGISTER_BACKEND_TYPE6 register backend
+Debug message issued when triggered an action to register backend
+
+% MYSQL_CB_TLS_CIPHER TLS cipher: %1
+A debug message issued when a new MySQL connected is created with TLS.
+The TLS cipher name is logged.
+
+% MYSQL_CB_UNREGISTER_BACKEND_TYPE4 unregister backend
+Debug message issued when triggered an action to unregister backend
+
+% MYSQL_CB_UNREGISTER_BACKEND_TYPE6 unregister backend
+Debug message issued when triggered an action to unregister backend
diff --git a/src/hooks/dhcp/mysql_cb/mysql_query_macros_dhcp.h b/src/hooks/dhcp/mysql_cb/mysql_query_macros_dhcp.h
new file mode 100644
index 0000000..60b3e80
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/mysql_query_macros_dhcp.h
@@ -0,0 +1,1356 @@
+// Copyright (C) 2018-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef MYSQL_QUERY_MACROS_DHCP_H
+#define MYSQL_QUERY_MACROS_DHCP_H
+
+/// @file mysql_query_macros_dhcp.h
+/// Collection of common macros defining MySQL prepared statements used
+/// to manage Kea DHCP configuration in the database.
+///
+/// Some of the macros are DHCPv4 specific, other are DHCPv6 specific.
+/// Some macros are common for both DHCP server types. The first
+/// parameter @c table_prefix should be set to @c dhcp4 or @c dhcp6,
+/// depending which DHCP server type it relates to. Provided value
+/// is used as a prefix for MySQL table names. For example, if the
+/// prefix is set to @c dhcp4, the table name referred to in the
+/// query may be dhcp4_subnet etc. The second argument in the variadic
+/// macro is a part of the WHERE clause in the MySQL query. The fixed
+/// part of the WHERE clause is included in the macro.
+
+/// @todo Update queries to also fetch server tags to associate
+/// returned configuration elements with particular servers.
+
+namespace isc {
+namespace dhcp {
+
+namespace {
+
+#ifndef MYSQL_GET_GLOBAL_PARAMETER
+#define MYSQL_GET_GLOBAL_PARAMETER(table_prefix, ...) \
+    "SELECT" \
+    "  g.id," \
+    "  g.name," \
+    "  g.value," \
+    "  g.parameter_type," \
+    "  g.modification_ts," \
+    "  s.tag " \
+    "FROM " #table_prefix "_global_parameter AS g " \
+    "INNER JOIN " #table_prefix "_global_parameter_server AS a " \
+    "  ON g.id = a.parameter_id " \
+    "INNER JOIN " #table_prefix "_server AS s " \
+    "  ON (a.server_id = s.id) " \
+    "WHERE (s.tag = ? OR s.id = 1) " #__VA_ARGS__ \
+    " ORDER BY g.id, s.id"
+#endif
+
+#ifndef MYSQL_GET_SUBNET4
+#define MYSQL_GET_SUBNET4_COMMON(server_join, ...) \
+    "SELECT" \
+    "  s.subnet_id," \
+    "  s.subnet_prefix," \
+    "  s.4o6_interface," \
+    "  s.4o6_interface_id," \
+    "  s.4o6_subnet," \
+    "  s.boot_file_name," \
+    "  s.client_class," \
+    "  s.interface," \
+    "  s.match_client_id," \
+    "  s.modification_ts," \
+    "  s.next_server," \
+    "  s.rebind_timer," \
+    "  s.relay," \
+    "  s.renew_timer," \
+    "  s.require_client_classes," \
+    "  s.reservations_global," \
+    "  s.server_hostname," \
+    "  s.shared_network_name," \
+    "  s.user_context," \
+    "  s.valid_lifetime," \
+    "  p.id," \
+    "  p.start_address," \
+    "  p.end_address," \
+    "  p.subnet_id," \
+    "  p.modification_ts," \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp4_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  x.modification_ts," \
+    "  o.option_id," \
+    "  o.code," \
+    "  o.value," \
+    "  o.formatted_value," \
+    "  o.space," \
+    "  o.persistent," \
+    "  o.cancelled," \
+    "  o.dhcp4_subnet_id," \
+    "  o.scope_id," \
+    "  o.user_context," \
+    "  o.shared_network_name," \
+    "  o.pool_id," \
+    "  o.modification_ts," \
+    "  s.calculate_tee_times," \
+    "  s.t1_percent," \
+    "  s.t2_percent," \
+    "  s.authoritative," \
+    "  s.min_valid_lifetime," \
+    "  s.max_valid_lifetime," \
+    "  p.client_class," \
+    "  p.require_client_classes," \
+    "  p.user_context," \
+    "  s.ddns_send_updates," \
+    "  s.ddns_override_no_update," \
+    "  s.ddns_override_client_update," \
+    "  s.ddns_replace_client_name," \
+    "  s.ddns_generated_prefix," \
+    "  s.ddns_qualifying_suffix," \
+    "  s.reservations_in_subnet," \
+    "  s.reservations_out_of_pool," \
+    "  s.cache_threshold," \
+    "  s.cache_max_age," \
+    "  s.offer_lifetime, " \
+    "  s.allocator, " \
+    "  srv.tag " \
+    "FROM dhcp4_subnet AS s " \
+    server_join \
+    "LEFT JOIN dhcp4_pool AS p ON s.subnet_id = p.subnet_id " \
+    "LEFT JOIN dhcp4_options AS x ON x.scope_id = 5 AND p.id = x.pool_id " \
+    "LEFT JOIN dhcp4_options AS o ON o.scope_id = 1 AND s.subnet_id = o.dhcp4_subnet_id " \
+    #__VA_ARGS__ \
+    " ORDER BY s.subnet_id, p.id, x.option_id, o.option_id"
+
+#define MYSQL_GET_SUBNET4_NO_TAG(...) \
+    MYSQL_GET_SUBNET4_COMMON( \
+    "INNER JOIN dhcp4_subnet_server AS a " \
+    "  ON s.subnet_id = a.subnet_id " \
+    "INNER JOIN dhcp4_server AS srv " \
+    "  ON (a.server_id = srv.id) ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_SUBNET4_ANY(...) \
+    MYSQL_GET_SUBNET4_COMMON( \
+    "LEFT JOIN dhcp4_subnet_server AS a "\
+    "  ON s.subnet_id = a.subnet_id " \
+    "LEFT JOIN dhcp4_server AS srv " \
+    "  ON a.server_id = srv.id ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_SUBNET4_UNASSIGNED(...) \
+    MYSQL_GET_SUBNET4_COMMON( \
+    "LEFT JOIN dhcp4_subnet_server AS a "\
+    "  ON s.subnet_id = a.subnet_id " \
+    "LEFT JOIN dhcp4_server AS srv " \
+    "  ON a.server_id = srv.id ", \
+    WHERE a.subnet_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef MYSQL_GET_SUBNET6
+#define MYSQL_GET_SUBNET6_COMMON(server_join, ...) \
+    "SELECT" \
+    "  s.subnet_id," \
+    "  s.subnet_prefix," \
+    "  s.client_class," \
+    "  s.interface," \
+    "  s.modification_ts," \
+    "  s.preferred_lifetime," \
+    "  s.rapid_commit," \
+    "  s.rebind_timer," \
+    "  s.relay," \
+    "  s.renew_timer," \
+    "  s.require_client_classes," \
+    "  s.reservations_global," \
+    "  s.shared_network_name," \
+    "  s.user_context," \
+    "  s.valid_lifetime," \
+    "  p.id," \
+    "  p.start_address," \
+    "  p.end_address," \
+    "  p.subnet_id," \
+    "  p.modification_ts," \
+    "  d.id," \
+    "  d.prefix," \
+    "  d.prefix_length," \
+    "  d.delegated_prefix_length," \
+    "  d.subnet_id," \
+    "  d.modification_ts," \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp6_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  x.modification_ts," \
+    "  x.pd_pool_id," \
+    "  y.option_id," \
+    "  y.code," \
+    "  y.value," \
+    "  y.formatted_value," \
+    "  y.space," \
+    "  y.persistent," \
+    "  y.cancelled," \
+    "  y.dhcp6_subnet_id," \
+    "  y.scope_id," \
+    "  y.user_context," \
+    "  y.shared_network_name," \
+    "  y.pool_id," \
+    "  y.modification_ts," \
+    "  y.pd_pool_id," \
+    "  o.option_id," \
+    "  o.code," \
+    "  o.value," \
+    "  o.formatted_value," \
+    "  o.space," \
+    "  o.persistent," \
+    "  o.cancelled," \
+    "  o.dhcp6_subnet_id," \
+    "  o.scope_id," \
+    "  o.user_context," \
+    "  o.shared_network_name," \
+    "  o.pool_id," \
+    "  o.modification_ts," \
+    "  o.pd_pool_id, " \
+    "  s.calculate_tee_times," \
+    "  s.t1_percent," \
+    "  s.t2_percent," \
+    "  s.interface_id," \
+    "  s.min_preferred_lifetime," \
+    "  s.max_preferred_lifetime," \
+    "  s.min_valid_lifetime," \
+    "  s.max_valid_lifetime," \
+    "  p.client_class," \
+    "  p.require_client_classes," \
+    "  p.user_context," \
+    "  d.excluded_prefix," \
+    "  d.excluded_prefix_length," \
+    "  d.client_class," \
+    "  d.require_client_classes," \
+    "  d.user_context," \
+    "  s.ddns_send_updates," \
+    "  s.ddns_override_no_update," \
+    "  s.ddns_override_client_update," \
+    "  s.ddns_replace_client_name," \
+    "  s.ddns_generated_prefix," \
+    "  s.ddns_qualifying_suffix," \
+    "  s.reservations_in_subnet," \
+    "  s.reservations_out_of_pool," \
+    "  s.cache_threshold," \
+    "  s.cache_max_age," \
+    "  s.allocator," \
+    "  s.pd_allocator," \
+    "  srv.tag " \
+    "FROM dhcp6_subnet AS s " \
+    server_join \
+    "LEFT JOIN dhcp6_pool AS p ON s.subnet_id = p.subnet_id " \
+    "LEFT JOIN dhcp6_pd_pool AS d ON s.subnet_id = d.subnet_id " \
+    "LEFT JOIN dhcp6_options AS x ON x.scope_id = 5 AND p.id = x.pool_id " \
+    "LEFT JOIN dhcp6_options AS y ON y.scope_id = 6 AND d.id = y.pd_pool_id " \
+    "LEFT JOIN dhcp6_options AS o ON o.scope_id = 1 AND s.subnet_id = o.dhcp6_subnet_id " \
+    #__VA_ARGS__                                                        \
+    " ORDER BY s.subnet_id, p.id, d.id, x.option_id, y.option_id, o.option_id"
+
+#define MYSQL_GET_SUBNET6_NO_TAG(...) \
+    MYSQL_GET_SUBNET6_COMMON( \
+    "INNER JOIN dhcp6_subnet_server AS a " \
+    "  ON s.subnet_id = a.subnet_id " \
+    "INNER JOIN dhcp6_server AS srv " \
+    "  ON (a.server_id = srv.id) ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_SUBNET6_ANY(...) \
+    MYSQL_GET_SUBNET6_COMMON( \
+    "LEFT JOIN dhcp6_subnet_server AS a "\
+    "  ON s.subnet_id = a.subnet_id " \
+    "LEFT JOIN dhcp6_server AS srv " \
+    "  ON a.server_id = srv.id ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_SUBNET6_UNASSIGNED(...) \
+    MYSQL_GET_SUBNET6_COMMON( \
+    "LEFT JOIN dhcp6_subnet_server AS a "\
+    "  ON s.subnet_id = a.subnet_id " \
+    "LEFT JOIN dhcp6_server AS srv " \
+    "  ON a.server_id = srv.id ", \
+    WHERE a.subnet_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef MYSQL_GET_POOL4_COMMON
+#define MYSQL_GET_POOL4_COMMON(server_join, ...) \
+      "SELECT" \
+      "  p.id," \
+      "  p.start_address," \
+      "  p.end_address," \
+      "  p.subnet_id," \
+      "  p.client_class," \
+      "  p.require_client_classes," \
+      "  p.user_context," \
+      "  p.modification_ts," \
+      "  x.option_id," \
+      "  x.code," \
+      "  x.value," \
+      "  x.formatted_value," \
+      "  x.space," \
+      "  x.persistent," \
+      "  x.cancelled," \
+      "  x.dhcp4_subnet_id," \
+      "  x.scope_id," \
+      "  x.user_context," \
+      "  x.shared_network_name," \
+      "  x.pool_id," \
+      "  x.modification_ts " \
+      "FROM dhcp4_pool AS p " \
+      server_join \
+      "LEFT JOIN dhcp4_options AS x ON x.scope_id = 5 AND p.id = x.pool_id " \
+      #__VA_ARGS__ \
+      " ORDER BY p.id, x.option_id"
+
+#define MYSQL_GET_POOL4_RANGE_WITH_TAG(...) \
+    MYSQL_GET_POOL4_COMMON( \
+       "INNER JOIN dhcp4_subnet_server AS s ON p.subnet_id = s.subnet_id " \
+       "INNER JOIN dhcp4_server AS srv " \
+       " ON (s.server_id = srv.id) OR (s.server_id = 1) ", \
+       __VA_ARGS__)
+
+#define MYSQL_GET_POOL4_RANGE_NO_TAG(...) \
+    MYSQL_GET_POOL4_COMMON("", __VA_ARGS__)
+#endif
+
+#ifndef MYSQL_GET_POOL6_COMMON
+#define MYSQL_GET_POOL6_COMMON(server_join, ...) \
+    "SELECT" \
+    "  p.id," \
+    "  p.start_address," \
+    "  p.end_address," \
+    "  p.subnet_id," \
+    "  p.client_class," \
+    "  p.require_client_classes," \
+    "  p.user_context," \
+    "  p.modification_ts," \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp6_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  x.modification_ts," \
+    "  x.pd_pool_id " \
+    "FROM dhcp6_pool AS p " \
+    server_join \
+    "LEFT JOIN dhcp6_options AS x ON x.scope_id = 5 AND p.id = x.pool_id " \
+    #__VA_ARGS__ \
+    " ORDER BY p.id, x.option_id"
+
+#define MYSQL_GET_POOL6_RANGE_WITH_TAG(...) \
+    MYSQL_GET_POOL6_COMMON( \
+    "INNER JOIN dhcp6_subnet_server AS s ON p.subnet_id = s.subnet_id " \
+    "INNER JOIN dhcp6_server AS srv " \
+    " ON (s.server_id = srv.id) OR (s.server_id = 1) ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_POOL6_RANGE_NO_TAG(...) \
+    MYSQL_GET_POOL6_COMMON("", __VA_ARGS__)
+#endif
+
+#ifndef MYSQL_GET_PD_POOL_COMMON
+#define MYSQL_GET_PD_POOL_COMMON(server_join, ...) \
+    "SELECT" \
+    "  p.id," \
+    "  p.prefix," \
+    "  p.prefix_length," \
+    "  p.delegated_prefix_length," \
+    "  p.subnet_id," \
+    "  p.excluded_prefix," \
+    "  p.excluded_prefix_length," \
+    "  p.client_class," \
+    "  p.require_client_classes," \
+    "  p.user_context," \
+    "  p.modification_ts," \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp6_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  x.modification_ts," \
+    "  x.pd_pool_id " \
+    "FROM dhcp6_pd_pool AS p " \
+    server_join \
+    "LEFT JOIN dhcp6_options AS x ON x.scope_id = 6 AND p.id = x.pd_pool_id " \
+    #__VA_ARGS__ \
+    " ORDER BY p.id, x.option_id" \
+
+#define MYSQL_GET_PD_POOL_WITH_TAG(...) \
+    MYSQL_GET_PD_POOL_COMMON( \
+    "INNER JOIN dhcp6_subnet_server AS s ON p.subnet_id = s.subnet_id " \
+    "INNER JOIN dhcp6_server AS srv " \
+    " ON (s.server_id = srv.id) OR (s.server_id = 1) ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_PD_POOL_NO_TAG(...) \
+    MYSQL_GET_PD_POOL_COMMON("", __VA_ARGS__)
+#endif
+
+#ifndef MYSQL_GET_SHARED_NETWORK4
+#define MYSQL_GET_SHARED_NETWORK4_COMMON(server_join, ...) \
+    "SELECT" \
+    "  n.id," \
+    "  n.name," \
+    "  n.client_class," \
+    "  n.interface," \
+    "  n.match_client_id," \
+    "  n.modification_ts," \
+    "  n.rebind_timer," \
+    "  n.relay," \
+    "  n.renew_timer," \
+    "  n.require_client_classes," \
+    "  n.reservations_global," \
+    "  n.user_context," \
+    "  n.valid_lifetime," \
+    "  o.option_id," \
+    "  o.code," \
+    "  o.value," \
+    "  o.formatted_value," \
+    "  o.space," \
+    "  o.persistent," \
+    "  o.cancelled," \
+    "  o.dhcp4_subnet_id," \
+    "  o.scope_id," \
+    "  o.user_context," \
+    "  o.shared_network_name," \
+    "  o.pool_id," \
+    "  o.modification_ts," \
+    "  n.calculate_tee_times," \
+    "  n.t1_percent," \
+    "  n.t2_percent," \
+    "  n.authoritative," \
+    "  n.boot_file_name," \
+    "  n.next_server," \
+    "  n.server_hostname," \
+    "  n.min_valid_lifetime," \
+    "  n.max_valid_lifetime," \
+    "  n.ddns_send_updates," \
+    "  n.ddns_override_no_update," \
+    "  n.ddns_override_client_update," \
+    "  n.ddns_replace_client_name," \
+    "  n.ddns_generated_prefix," \
+    "  n.ddns_qualifying_suffix," \
+    "  n.reservations_in_subnet," \
+    "  n.reservations_out_of_pool," \
+    "  n.cache_threshold," \
+    "  n.cache_max_age," \
+    "  n.offer_lifetime, " \
+    "  n.allocator, " \
+    "  s.tag " \
+    "FROM dhcp4_shared_network AS n " \
+    server_join \
+    "LEFT JOIN dhcp4_options AS o ON o.scope_id = 4 AND n.name = o.shared_network_name " \
+    #__VA_ARGS__ \
+    " ORDER BY n.id, s.id, o.option_id"
+
+#define MYSQL_GET_SHARED_NETWORK4_NO_TAG(...) \
+    MYSQL_GET_SHARED_NETWORK4_COMMON( \
+    "INNER JOIN dhcp4_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "INNER JOIN dhcp4_server AS s " \
+    "  ON (a.server_id = s.id) ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_SHARED_NETWORK4_ANY(...) \
+    MYSQL_GET_SHARED_NETWORK4_COMMON( \
+    "LEFT JOIN dhcp4_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "LEFT JOIN dhcp4_server AS s " \
+    "  ON a.server_id = s.id ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_SHARED_NETWORK4_UNASSIGNED(...) \
+    MYSQL_GET_SHARED_NETWORK4_COMMON( \
+    "LEFT JOIN dhcp4_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "LEFT JOIN dhcp4_server AS s " \
+    "  ON a.server_id = s.id ", \
+    WHERE a.shared_network_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef MYSQL_GET_SHARED_NETWORK6
+#define MYSQL_GET_SHARED_NETWORK6_COMMON(server_join, ...) \
+    "SELECT" \
+    "  n.id," \
+    "  n.name," \
+    "  n.client_class," \
+    "  n.interface," \
+    "  n.modification_ts," \
+    "  n.preferred_lifetime," \
+    "  n.rapid_commit," \
+    "  n.rebind_timer," \
+    "  n.relay," \
+    "  n.renew_timer," \
+    "  n.require_client_classes," \
+    "  n.reservations_global," \
+    "  n.user_context," \
+    "  n.valid_lifetime," \
+    "  o.option_id," \
+    "  o.code," \
+    "  o.value," \
+    "  o.formatted_value," \
+    "  o.space," \
+    "  o.persistent," \
+    "  o.cancelled," \
+    "  o.dhcp6_subnet_id," \
+    "  o.scope_id," \
+    "  o.user_context," \
+    "  o.shared_network_name," \
+    "  o.pool_id," \
+    "  o.modification_ts," \
+    "  o.pd_pool_id, " \
+    "  n.calculate_tee_times," \
+    "  n.t1_percent," \
+    "  n.t2_percent," \
+    "  n.interface_id," \
+    "  n.min_preferred_lifetime," \
+    "  n.max_preferred_lifetime," \
+    "  n.min_valid_lifetime," \
+    "  n.max_valid_lifetime," \
+    "  n.ddns_send_updates," \
+    "  n.ddns_override_no_update," \
+    "  n.ddns_override_client_update," \
+    "  n.ddns_replace_client_name," \
+    "  n.ddns_generated_prefix," \
+    "  n.ddns_qualifying_suffix," \
+    "  n.reservations_in_subnet," \
+    "  n.reservations_out_of_pool," \
+    "  n.cache_threshold," \
+    "  n.cache_max_age," \
+    "  n.allocator," \
+    "  n.pd_allocator," \
+    "  s.tag " \
+    "FROM dhcp6_shared_network AS n " \
+    server_join \
+    "LEFT JOIN dhcp6_options AS o ON o.scope_id = 4 AND n.name = o.shared_network_name " \
+    #__VA_ARGS__ \
+    " ORDER BY n.id, s.id, o.option_id"
+
+#define MYSQL_GET_SHARED_NETWORK6_NO_TAG(...) \
+    MYSQL_GET_SHARED_NETWORK6_COMMON( \
+    "INNER JOIN dhcp6_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "INNER JOIN dhcp6_server AS s " \
+    "  ON (a.server_id = s.id) ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_SHARED_NETWORK6_ANY(...) \
+    MYSQL_GET_SHARED_NETWORK6_COMMON( \
+    "LEFT JOIN dhcp6_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "LEFT JOIN dhcp6_server AS s " \
+    "  ON a.server_id = s.id ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_SHARED_NETWORK6_UNASSIGNED(...) \
+    MYSQL_GET_SHARED_NETWORK6_COMMON( \
+    "LEFT JOIN dhcp6_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "LEFT JOIN dhcp6_server AS s " \
+    "  ON a.server_id = s.id ", \
+    WHERE a.shared_network_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef MYSQL_GET_OPTION_DEF
+#define MYSQL_GET_OPTION_DEF(table_prefix, ...) \
+    "SELECT" \
+    "  d.id," \
+    "  d.code," \
+    "  d.name," \
+    "  d.space," \
+    "  d.type," \
+    "  d.modification_ts," \
+    "  d.is_array," \
+    "  d.encapsulate," \
+    "  d.record_types," \
+    "  d.user_context," \
+    "  s.tag " \
+    "FROM " #table_prefix "_option_def AS d " \
+    "INNER JOIN " #table_prefix "_option_def_server AS a" \
+    "  ON d.id = a.option_def_id " \
+    "INNER JOIN " #table_prefix "_server AS s " \
+    "  ON a.server_id = s.id " \
+    "WHERE (s.tag = ? OR s.id = 1) " #__VA_ARGS__ \
+    " ORDER BY d.id"
+#endif
+
+#ifndef MYSQL_GET_OPTION_COMMON
+#define MYSQL_GET_OPTION_COMMON(table_prefix, pd_pool_id, ...) \
+    "SELECT" \
+    "  o.option_id," \
+    "  o.code," \
+    "  o.value," \
+    "  o.formatted_value," \
+    "  o.space," \
+    "  o.persistent," \
+    "  o.cancelled," \
+    "  o." #table_prefix "_subnet_id," \
+    "  o.scope_id," \
+    "  o.user_context," \
+    "  o.shared_network_name," \
+    "  o.pool_id," \
+    "  o.modification_ts," \
+    "  s.tag " \
+    pd_pool_id \
+    "FROM " #table_prefix "_options AS o " \
+    "INNER JOIN " #table_prefix "_options_server AS a" \
+    "  ON o.option_id = a.option_id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON a.server_id = s.id " \
+    "WHERE (s.tag = ? OR s.id = 1) " #__VA_ARGS__ \
+    " ORDER BY o.option_id, s.id"
+
+#define MYSQL_GET_OPTION4(...) \
+    MYSQL_GET_OPTION_COMMON(dhcp4, "", __VA_ARGS__)
+
+#define MYSQL_GET_OPTION6(...) \
+    MYSQL_GET_OPTION_COMMON(dhcp6, ", o.pd_pool_id ", __VA_ARGS__)
+#endif
+
+#ifndef MYSQL_GET_AUDIT_ENTRIES_TIME
+#define MYSQL_GET_AUDIT_ENTRIES_TIME(table_prefix) \
+    "SELECT" \
+    "  a.id," \
+    "  a.object_type," \
+    "  a.object_id," \
+    "  a.modification_type," \
+    "  r.modification_ts," \
+    "  r.id, " \
+    "  r.log_message " \
+    "FROM " #table_prefix "_audit AS a " \
+    "INNER JOIN " #table_prefix "_audit_revision AS r " \
+    "  ON a.revision_id = r.id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON r.server_id = s.id " \
+    "WHERE (s.tag = ? OR s.id = 1) AND ((r.modification_ts, r.id) > (?, ?))" \
+    " ORDER BY r.modification_ts, r.id"
+#endif
+
+#ifndef MYSQL_GET_SERVERS_COMMON
+#define MYSQL_GET_SERVERS_COMMON(table_prefix, ...) \
+    "SELECT" \
+    "  s.id," \
+    "  s.tag," \
+    "  s.description," \
+    "  s.modification_ts " \
+    "FROM " #table_prefix "_server AS s " \
+    "WHERE s.id > 1 " \
+    __VA_ARGS__ \
+    "ORDER BY s.id"
+
+#define MYSQL_GET_ALL_SERVERS(table_prefix) \
+    MYSQL_GET_SERVERS_COMMON(table_prefix, "")
+
+#define MYSQL_GET_SERVER(table_prefix) \
+    MYSQL_GET_SERVERS_COMMON(table_prefix, "AND s.tag = ? ")
+#endif
+
+#ifndef MYSQL_GET_CLIENT_CLASS4_COMMON
+#define MYSQL_GET_CLIENT_CLASS4_COMMON(server_join, ...) \
+    "SELECT " \
+    "  c.id," \
+    "  c.name," \
+    "  c.test," \
+    "  c.next_server," \
+    "  c.server_hostname," \
+    "  c.boot_file_name," \
+    "  c.only_if_required," \
+    "  c.valid_lifetime," \
+    "  c.min_valid_lifetime," \
+    "  c.max_valid_lifetime," \
+    "  c.depend_on_known_directly," \
+    "  o.depend_on_known_indirectly, " \
+    "  c.modification_ts," \
+    "  c.user_context," \
+    "  c.offer_lifetime," \
+    "  d.id," \
+    "  d.code," \
+    "  d.name," \
+    "  d.space," \
+    "  d.type," \
+    "  d.modification_ts," \
+    "  d.is_array," \
+    "  d.encapsulate," \
+    "  d.record_types," \
+    "  d.user_context," \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp4_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  x.modification_ts," \
+    "  s.tag " \
+    "FROM dhcp4_client_class AS c " \
+    "INNER JOIN dhcp4_client_class_order AS o " \
+    "  ON c.id = o.class_id " \
+    server_join \
+    "LEFT JOIN dhcp4_option_def AS d ON c.id = d.class_id " \
+    "LEFT JOIN dhcp4_options AS x ON x.scope_id = 2 AND c.name = x.dhcp_client_class " \
+    #__VA_ARGS__ \
+    "  ORDER BY o.order_index, d.id, x.option_id"
+
+#define MYSQL_GET_CLIENT_CLASS4_WITH_TAG(...) \
+    MYSQL_GET_CLIENT_CLASS4_COMMON( \
+    "INNER JOIN dhcp4_client_class_server AS a " \
+    "  ON c.id = a.class_id " \
+    "INNER JOIN dhcp4_server AS s " \
+    "  ON a.server_id = s.id ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_CLIENT_CLASS4_UNASSIGNED(...) \
+    MYSQL_GET_CLIENT_CLASS4_COMMON( \
+    "LEFT JOIN dhcp4_client_class_server AS a " \
+    "  ON c.id = a.class_id " \
+    "LEFT JOIN dhcp4_server AS s " \
+    "  ON a.server_id = s.id ", \
+    WHERE a.class_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef MYSQL_GET_CLIENT_CLASS6_COMMON
+#define MYSQL_GET_CLIENT_CLASS6_COMMON(server_join, ...) \
+    "SELECT " \
+    "  c.id," \
+    "  c.name," \
+    "  c.test," \
+    "  c.only_if_required," \
+    "  c.valid_lifetime," \
+    "  c.min_valid_lifetime," \
+    "  c.max_valid_lifetime," \
+    "  c.depend_on_known_directly," \
+    "  o.depend_on_known_indirectly, " \
+    "  c.modification_ts," \
+    "  c.user_context," \
+    "  d.id," \
+    "  d.code," \
+    "  d.name," \
+    "  d.space," \
+    "  d.type," \
+    "  d.modification_ts," \
+    "  d.is_array," \
+    "  d.encapsulate," \
+    "  d.record_types," \
+    "  d.user_context," \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp6_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  x.modification_ts," \
+    "  s.tag, " \
+    "  c.preferred_lifetime," \
+    "  c.min_preferred_lifetime, " \
+    "  c.max_preferred_lifetime " \
+    "FROM dhcp6_client_class AS c " \
+    "INNER JOIN dhcp6_client_class_order AS o " \
+    "  ON c.id = o.class_id " \
+    server_join \
+    "LEFT JOIN dhcp6_option_def AS d ON c.id = d.class_id " \
+    "LEFT JOIN dhcp6_options AS x ON x.scope_id = 2 AND c.name = x.dhcp_client_class " \
+    #__VA_ARGS__ \
+    "  ORDER BY o.order_index, d.id, x.option_id"
+
+#define MYSQL_GET_CLIENT_CLASS6_WITH_TAG(...) \
+    MYSQL_GET_CLIENT_CLASS6_COMMON( \
+    "INNER JOIN dhcp6_client_class_server AS a " \
+    "  ON c.id = a.class_id " \
+    "INNER JOIN dhcp6_server AS s " \
+    "  ON a.server_id = s.id ", \
+    __VA_ARGS__)
+
+#define MYSQL_GET_CLIENT_CLASS6_UNASSIGNED(...) \
+    MYSQL_GET_CLIENT_CLASS6_COMMON( \
+    "LEFT JOIN dhcp6_client_class_server AS a " \
+    "  ON c.id = a.class_id " \
+    "LEFT JOIN dhcp6_server AS s " \
+    "  ON a.server_id = s.id ", \
+    WHERE a.class_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef MYSQL_INSERT_GLOBAL_PARAMETER
+#define MYSQL_INSERT_GLOBAL_PARAMETER(table_prefix) \
+    "INSERT INTO " #table_prefix "_global_parameter(" \
+    "  name," \
+    "  value," \
+    "  parameter_type," \
+    "  modification_ts" \
+    ") VALUES (?, ?, ?, ?)"
+#endif
+
+#ifndef MYSQL_INSERT_GLOBAL_PARAMETER_SERVER
+#define MYSQL_INSERT_GLOBAL_PARAMETER_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_global_parameter_server(" \
+    "  parameter_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES (?, ?, (SELECT id FROM " #table_prefix "_server WHERE tag = ?))"
+#endif
+
+#ifndef MYSQL_INSERT_SUBNET_SERVER
+#define MYSQL_INSERT_SUBNET_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_subnet_server(" \
+    "  subnet_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES (?, ?, (SELECT id FROM " #table_prefix "_server WHERE tag = ?))"
+#endif
+
+#ifndef MYSQL_INSERT_POOL
+#define MYSQL_INSERT_POOL(table_prefix) \
+    "INSERT INTO " #table_prefix "_pool(" \
+    "  start_address," \
+    "  end_address," \
+    "  subnet_id," \
+    "  client_class," \
+    "  require_client_classes," \
+    "  user_context," \
+    "  modification_ts" \
+    ") VALUES (?, ?, ?, ?, ?, ?, ?)"
+#endif
+
+#ifndef MYSQL_INSERT_PD_POOL
+#define MYSQL_INSERT_PD_POOL() \
+    "INSERT INTO dhcp6_pd_pool(" \
+    "  prefix," \
+    "  prefix_length," \
+    "  delegated_prefix_length," \
+    "  subnet_id," \
+    "  excluded_prefix," \
+    "  excluded_prefix_length," \
+    "  client_class," \
+    "  require_client_classes," \
+    "  user_context," \
+    "  modification_ts" \
+    ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
+#endif
+
+#ifndef MYSQL_INSERT_SHARED_NETWORK_SERVER
+#define MYSQL_INSERT_SHARED_NETWORK_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_shared_network_server(" \
+    "  shared_network_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES (" \
+    "    (SELECT id FROM " #table_prefix "_shared_network WHERE name = ?), ?," \
+    "    (SELECT id FROM " #table_prefix "_server WHERE tag = ?)" \
+    ")"
+#endif
+
+#ifndef MYSQL_INSERT_OPTION_DEF
+#define MYSQL_INSERT_OPTION_DEF(table_prefix) \
+    "INSERT INTO " #table_prefix "_option_def (" \
+    "  code," \
+    "  name," \
+    "  space," \
+    "  type," \
+    "  modification_ts," \
+    "  is_array," \
+    "  encapsulate," \
+    "  record_types," \
+    "  user_context," \
+    "  class_id" \
+    ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
+#endif
+
+#ifndef MYSQL_INSERT_OPTION_DEF_CLIENT_CLASS
+#define MYSQL_INSERT_OPTION_DEF_CLIENT_CLASS(table_prefix) \
+    "INSERT INTO " #table_prefix "_option_def (" \
+    "  code," \
+    "  name," \
+    "  space," \
+    "  type," \
+    "  modification_ts," \
+    "  is_array," \
+    "  encapsulate," \
+    "  record_types," \
+    "  user_context," \
+    "  class_id" \
+    ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, (SELECT id FROM " #table_prefix "_client_class WHERE name = ?))"
+#endif
+
+#ifndef MYSQL_INSERT_OPTION_DEF_SERVER
+#define MYSQL_INSERT_OPTION_DEF_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_option_def_server(" \
+    "  option_def_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES (?, ?, (SELECT id FROM " #table_prefix "_server WHERE tag = ?))"
+#endif
+
+#ifndef MYSQL_INSERT_OPTION_COMMON
+#define MYSQL_INSERT_OPTION_COMMON(table_prefix, pd_pool_id, last) \
+    "INSERT INTO " #table_prefix "_options (" \
+    "  code," \
+    "  value," \
+    "  formatted_value," \
+    "  space," \
+    "  persistent," \
+    "  cancelled," \
+    "  dhcp_client_class," \
+    " " #table_prefix "_subnet_id," \
+    "  scope_id," \
+    "  user_context," \
+    "  shared_network_name," \
+    "  pool_id," \
+    "  modification_ts" \
+    pd_pool_id \
+    ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?" last ")"
+
+#define MYSQL_INSERT_OPTION4() \
+    MYSQL_INSERT_OPTION_COMMON(dhcp4, "", "")
+
+#define MYSQL_INSERT_OPTION6() \
+    MYSQL_INSERT_OPTION_COMMON(dhcp6, ", pd_pool_id ", ", ?")
+#endif
+
+#ifndef MYSQL_INSERT_OPTION_SERVER
+#define MYSQL_INSERT_OPTION_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_options_server (" \
+    "  option_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES (?, ?, (SELECT id FROM " #table_prefix "_server WHERE tag = ?))"
+#endif
+
+#ifndef MYSQL_INSERT_CLIENT_CLASS_SERVER
+#define MYSQL_INSERT_CLIENT_CLASS_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_client_class_server (" \
+    "  class_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES ((SELECT id FROM " #table_prefix "_client_class WHERE name = ?), ?, (SELECT id FROM " #table_prefix "_server WHERE tag = ?))"
+#endif
+
+#ifndef MYSQL_INSERT_CLIENT_CLASS_DEPENDENCY
+#define MYSQL_INSERT_CLIENT_CLASS_DEPENDENCY(table_prefix) \
+    "INSERT INTO " #table_prefix "_client_class_dependency (" \
+    "  class_id," \
+    "  dependency_id" \
+    ") VALUES ((SELECT id FROM " #table_prefix "_client_class WHERE name = ?), (SELECT id FROM " #table_prefix "_client_class WHERE name = ?))"
+#endif
+
+#ifndef MYSQL_INSERT_SERVER
+#define MYSQL_INSERT_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_server (" \
+    "  tag," \
+    "  description," \
+    "  modification_ts" \
+    ") VALUES (?, ?, ?)"
+#endif
+
+#ifndef MYSQL_UPDATE_GLOBAL_PARAMETER
+#define MYSQL_UPDATE_GLOBAL_PARAMETER(table_prefix) \
+    "UPDATE " #table_prefix "_global_parameter AS g " \
+    "INNER JOIN " #table_prefix "_global_parameter_server AS a" \
+    "  ON g.id = a.parameter_id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON a.server_id = s.id " \
+    "SET" \
+    "  g.name = ?," \
+    "  g.value = ?," \
+    "  g.parameter_type = ?," \
+    "  g.modification_ts = ? " \
+    "WHERE s.tag = ? AND g.name = ?"
+#endif
+
+#ifndef MYSQL_UPDATE_OPTION_DEF
+#define MYSQL_UPDATE_OPTION_DEF(table_prefix) \
+    "UPDATE " #table_prefix "_option_def AS d " \
+    "INNER JOIN " #table_prefix "_option_def_server AS a" \
+    "  ON d.id = a.option_def_id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON a.server_id = s.id " \
+    "SET" \
+    "  d.code = ?," \
+    "  d.name = ?," \
+    "  d.space = ?," \
+    "  d.type = ?," \
+    "  d.modification_ts = ?," \
+    "  d.is_array = ?," \
+    "  d.encapsulate = ?," \
+    "  d.record_types = ?," \
+    "  d.user_context = ?, " \
+    "  d.class_id = ? " \
+    "WHERE s.tag = ? AND d.code = ? AND d.space = ?"
+#endif
+
+#ifndef MYSQL_UPDATE_OPTION_DEF_CLIENT_CLASS
+#define MYSQL_UPDATE_OPTION_DEF_CLIENT_CLASS(table_prefix) \
+    "UPDATE " #table_prefix "_option_def AS d " \
+    "INNER JOIN " #table_prefix "_option_def_server AS a" \
+    "  ON d.id = a.option_def_id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON a.server_id = s.id " \
+    "SET" \
+    "  d.code = ?," \
+    "  d.name = ?," \
+    "  d.space = ?," \
+    "  d.type = ?," \
+    "  d.modification_ts = ?," \
+    "  d.is_array = ?," \
+    "  d.encapsulate = ?," \
+    "  d.record_types = ?," \
+    "  d.user_context = ? " \
+    "WHERE d.class_id = (SELECT id FROM " #table_prefix "_client_class WHERE name = ?) " \
+    "  AND s.tag = ? AND d.code = ? AND d.space = ?"
+#endif
+
+#ifndef MYSQL_UPDATE_OPTION_COMMON
+#define MYSQL_UPDATE_OPTION_COMMON(table_prefix, server_join, pd_pool_id, ...) \
+    "UPDATE " #table_prefix "_options AS o " \
+    server_join \
+    "SET" \
+    "  o.code = ?," \
+    "  o.value = ?," \
+    "  o.formatted_value = ?," \
+    "  o.space = ?," \
+    "  o.persistent = ?," \
+    "  o.cancelled = ?," \
+    "  o.dhcp_client_class = ?," \
+    "  o." #table_prefix "_subnet_id = ?," \
+    "  o.scope_id = ?," \
+    "  o.user_context = ?," \
+    "  o.shared_network_name = ?," \
+    "  o.pool_id = ?," \
+    "  o.modification_ts = ? " \
+    pd_pool_id \
+    "WHERE " #__VA_ARGS__
+
+#define MYSQL_UPDATE_OPTION4_WITH_TAG(...) \
+    MYSQL_UPDATE_OPTION_COMMON(dhcp4, \
+    "INNER JOIN dhcp4_options_server AS a" \
+    "  ON o.option_id = a.option_id " \
+    "INNER JOIN dhcp4_server AS s" \
+    "  ON a.server_id = s.id ", \
+    "", s.tag = ? __VA_ARGS__)
+
+#define MYSQL_UPDATE_OPTION4_NO_TAG(...) \
+    MYSQL_UPDATE_OPTION_COMMON(dhcp4, "", "", __VA_ARGS__)
+
+#define MYSQL_UPDATE_OPTION6_WITH_TAG(...) \
+    MYSQL_UPDATE_OPTION_COMMON(dhcp6, \
+    "INNER JOIN dhcp6_options_server AS a" \
+    "  ON o.option_id = a.option_id " \
+    "INNER JOIN dhcp6_server AS s" \
+    "  ON a.server_id = s.id ", \
+    ", o.pd_pool_id = ? ", s.tag = ? __VA_ARGS__)
+
+#define MYSQL_UPDATE_OPTION6_NO_TAG(...) \
+    MYSQL_UPDATE_OPTION_COMMON(dhcp6, "", ", o.pd_pool_id = ? ", __VA_ARGS__)
+#endif
+
+#ifndef MYSQL_UPDATE_CLIENT_CLASS4
+#define MYSQL_UPDATE_CLIENT_CLASS4(follow_class_name_set) \
+    "UPDATE dhcp4_client_class SET" \
+    "  name = ?," \
+    "  test = ?," \
+    "  next_server = ?," \
+    "  server_hostname = ?," \
+    "  boot_file_name = ?," \
+    "  only_if_required = ?," \
+    "  valid_lifetime = ?," \
+    "  min_valid_lifetime = ?," \
+    "  max_valid_lifetime = ?," \
+    "  depend_on_known_directly = ?," \
+    follow_class_name_set \
+    "  modification_ts = ?, " \
+    "  user_context = ?," \
+    "  offer_lifetime = ? "\
+    "WHERE name = ?"
+#endif
+
+#ifndef MYSQL_UPDATE_CLIENT_CLASS6
+#define MYSQL_UPDATE_CLIENT_CLASS6(follow_class_name_set) \
+    "UPDATE dhcp6_client_class SET" \
+    "  name = ?," \
+    "  test = ?," \
+    "  only_if_required = ?," \
+    "  valid_lifetime = ?," \
+    "  min_valid_lifetime = ?," \
+    "  max_valid_lifetime = ?," \
+    "  depend_on_known_directly = ?," \
+    follow_class_name_set \
+    "  preferred_lifetime = ?, " \
+    "  min_preferred_lifetime = ?, " \
+    "  max_preferred_lifetime = ?, " \
+    "  modification_ts = ?, " \
+    "  user_context = ? " \
+    "WHERE name = ?"
+#endif
+
+#ifndef MYSQL_UPDATE_SERVER
+#define MYSQL_UPDATE_SERVER(table_prefix) \
+    "UPDATE " #table_prefix "_server " \
+    "SET" \
+    "  tag = ?," \
+    "  description = ?," \
+    "  modification_ts = ? " \
+    "WHERE tag = ?"
+#endif
+
+#ifndef MYSQL_DELETE_GLOBAL_PARAMETER
+#define MYSQL_DELETE_GLOBAL_PARAMETER(table_prefix, ...) \
+    "DELETE g FROM " #table_prefix "_global_parameter AS g " \
+    "INNER JOIN " #table_prefix "_global_parameter_server AS a " \
+    "  ON g.id = a.parameter_id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON (a.server_id = s.id) " \
+    "WHERE s.tag = ? " #__VA_ARGS__
+#endif
+
+#ifndef MYSQL_DELETE_GLOBAL_PARAMETER_UNASSIGNED
+#define MYSQL_DELETE_GLOBAL_PARAMETER_UNASSIGNED(table_prefix, ...) \
+    "DELETE g FROM " #table_prefix "_global_parameter AS g " \
+    "LEFT JOIN " #table_prefix "_global_parameter_server AS a " \
+    "  ON g.id = a.parameter_id " \
+    "WHERE a.parameter_id IS NULL " #__VA_ARGS__
+#endif
+
+#ifndef MYSQL_DELETE_SUBNET
+#define MYSQL_DELETE_SUBNET_COMMON(table_prefix, ...) \
+    "DELETE s FROM " #table_prefix "_subnet AS s " \
+    "INNER JOIN " #table_prefix "_subnet_server AS a " \
+    "  ON s.subnet_id = a.subnet_id " \
+    "INNER JOIN " #table_prefix "_server AS srv" \
+    "  ON a.server_id = srv.id " \
+    #__VA_ARGS__
+
+#define MYSQL_DELETE_SUBNET_WITH_TAG(table_prefix, ...) \
+    MYSQL_DELETE_SUBNET_COMMON(table_prefix, WHERE srv.tag = ? __VA_ARGS__)
+
+#define MYSQL_DELETE_SUBNET_ANY(table_prefix, ...) \
+    "DELETE s FROM " #table_prefix "_subnet AS s " \
+    #__VA_ARGS__
+
+#define MYSQL_DELETE_SUBNET_UNASSIGNED(table_prefix, ...) \
+    "DELETE s FROM " #table_prefix "_subnet AS s " \
+    "LEFT JOIN " #table_prefix "_subnet_server AS a" \
+    "  ON s.subnet_id = a.subnet_id " \
+    "WHERE a.subnet_id IS NULL " #__VA_ARGS__
+#endif
+
+#ifndef MYSQL_DELETE_SUBNET_SERVER
+#define MYSQL_DELETE_SUBNET_SERVER(table_prefix) \
+    "DELETE FROM " #table_prefix "_subnet_server " \
+    "WHERE subnet_id = ?"
+#endif
+
+#ifndef MYSQL_DELETE_POOLS
+#define MYSQL_DELETE_POOLS(table_prefix) \
+    "DELETE FROM " #table_prefix "_pool " \
+    "WHERE subnet_id = ? OR subnet_id = " \
+    "(SELECT subnet_id FROM " #table_prefix "_subnet" \
+    "    WHERE subnet_prefix = ?)"
+#endif
+
+#ifndef MYSQL_DELETE_PD_POOLS
+#define MYSQL_DELETE_PD_POOLS() \
+    "DELETE FROM dhcp6_pd_pool " \
+    "WHERE subnet_id = ? OR subnet_id = " \
+    "(SELECT subnet_id FROM dhcp6_subnet" \
+    "    WHERE subnet_prefix = ?)"
+#endif
+
+#ifndef MYSQL_DELETE_SHARED_NETWORK_COMMON
+#define MYSQL_DELETE_SHARED_NETWORK_COMMON(table_prefix, ...) \
+    "DELETE n FROM " #table_prefix "_shared_network AS n " \
+    "INNER JOIN " #table_prefix "_shared_network_server AS a" \
+    "  ON n.id = a.shared_network_id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON a.server_id = s.id " \
+    #__VA_ARGS__
+
+#define MYSQL_DELETE_SHARED_NETWORK_WITH_TAG(table_prefix, ...) \
+    MYSQL_DELETE_SHARED_NETWORK_COMMON(table_prefix, WHERE s.tag = ? __VA_ARGS__)
+
+#define MYSQL_DELETE_SHARED_NETWORK_ANY(table_prefix, ...) \
+    "DELETE n FROM " #table_prefix "_shared_network AS n " \
+    #__VA_ARGS__
+
+#define MYSQL_DELETE_SHARED_NETWORK_UNASSIGNED(table_prefix, ...) \
+    "DELETE n FROM " #table_prefix "_shared_network AS n " \
+    "LEFT JOIN " #table_prefix "_shared_network_server AS a" \
+    "  ON n.id = a.shared_network_id " \
+    "WHERE a.shared_network_id IS NULL " #__VA_ARGS__
+#endif
+
+#ifndef MYSQL_DELETE_SHARED_NETWORK_SERVER
+#define MYSQL_DELETE_SHARED_NETWORK_SERVER(table_prefix) \
+    "DELETE FROM " #table_prefix "_shared_network_server " \
+    "WHERE shared_network_id = " \
+    "(SELECT id FROM " #table_prefix "_shared_network WHERE name = ?)"
+#endif
+
+#ifndef MYSQL_DELETE_OPTION_DEF
+#define MYSQL_DELETE_OPTION_DEF(table_prefix, ...) \
+    "DELETE d FROM " #table_prefix "_option_def AS d " \
+    "INNER JOIN " #table_prefix "_option_def_server AS a" \
+    "  ON d.id = a.option_def_id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON a.server_id = s.id " \
+    "WHERE s.tag = ? " #__VA_ARGS__
+#endif
+
+#ifndef MYSQL_DELETE_OPTION_DEF_UNASSIGNED
+#define MYSQL_DELETE_OPTION_DEF_UNASSIGNED(table_prefix, ...) \
+    "DELETE d FROM " #table_prefix "_option_def AS d " \
+    "LEFT JOIN " #table_prefix "_option_def_server AS a " \
+    "  ON d.id = a.option_def_id " \
+    "WHERE a.option_def_id IS NULL " #__VA_ARGS__
+#endif
+
+#ifndef MYSQL_DELETE_OPTION_DEFS_CLIENT_CLASS
+#define MYSQL_DELETE_OPTION_DEFS_CLIENT_CLASS(table_prefix) \
+    "DELETE FROM " #table_prefix "_option_def " \
+    "WHERE class_id = (SELECT id FROM " #table_prefix "_client_class WHERE name = ?)"
+#endif
+
+#ifndef MYSQL_DELETE_OPTION_WITH_TAG
+#define MYSQL_DELETE_OPTION_WITH_TAG(table_prefix, ...) \
+    "DELETE o FROM " #table_prefix "_options AS o " \
+    "INNER JOIN " #table_prefix "_options_server AS a" \
+    "  ON o.option_id = a.option_id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON a.server_id = s.id " \
+    "WHERE s.tag = ? " #__VA_ARGS__
+#endif
+
+#ifndef MYSQL_DELETE_OPTION_NO_TAG
+#define MYSQL_DELETE_OPTION_NO_TAG(table_prefix, ...) \
+    "DELETE o FROM " #table_prefix "_options AS o " \
+    #__VA_ARGS__
+#endif
+
+#ifndef MYSQL_DELETE_OPTION_SUBNET_ID_PREFIX
+#define MYSQL_DELETE_OPTION_SUBNET_ID_PREFIX(table_prefix) \
+    "DELETE o FROM " #table_prefix "_options AS o " \
+    "INNER JOIN " #table_prefix "_subnet AS s " \
+    "  ON s.subnet_id = o." #table_prefix "_subnet_id " \
+    "WHERE o.scope_id = 1 AND (s.subnet_id = ? OR s.subnet_prefix = ?)"
+#endif
+
+#ifndef MYSQL_DELETE_OPTION_UNASSIGNED
+#define MYSQL_DELETE_OPTION_UNASSIGNED(table_prefix, ...) \
+    "DELETE o FROM " #table_prefix "_options AS o " \
+    "LEFT JOIN " #table_prefix "_options_server AS a " \
+    "  ON o.option_id = a.option_id " \
+    "WHERE a.option_id IS NULL " #__VA_ARGS__
+#endif
+
+#ifndef MYSQL_DELETE_OPTION_POOL_RANGE
+#define MYSQL_DELETE_OPTION_POOL_RANGE(table_prefix, ...) \
+    "DELETE o FROM " #table_prefix "_options AS o " \
+    "WHERE " #__VA_ARGS__ \
+    "  AND o.pool_id = " \
+    "  (SELECT id FROM " #table_prefix "_pool" \
+    "   WHERE start_address = ? AND end_address = ?)"
+#endif
+
+#ifndef MYSQL_DELETE_OPTION_PD_POOL
+#define MYSQL_DELETE_OPTION_PD_POOL(...) \
+    "DELETE o FROM dhcp6_options AS o " \
+    "WHERE " #__VA_ARGS__ \
+    "  AND o.pd_pool_id = " \
+    "  (SELECT id FROM dhcp6_pd_pool" \
+    "   WHERE prefix = ? AND prefix_length = ?)"
+#endif
+
+#ifndef MYSQL_DELETE_CLIENT_CLASS_DEPENDENCY
+#define MYSQL_DELETE_CLIENT_CLASS_DEPENDENCY(table_prefix) \
+    "DELETE FROM " #table_prefix "_client_class_dependency " \
+    "WHERE class_id = (SELECT id FROM " #table_prefix "_client_class WHERE name = ?)"
+#endif
+
+#ifndef MYSQL_DELETE_CLIENT_CLASS_SERVER
+#define MYSQL_DELETE_CLIENT_CLASS_SERVER(table_prefix) \
+    "DELETE FROM " #table_prefix "_client_class_server " \
+    "WHERE class_id = " \
+    "(SELECT id FROM " #table_prefix "_client_class WHERE name = ?)"
+#endif
+
+#ifndef MYSQL_DELETE_CLIENT_CLASS_COMMON
+#define MYSQL_DELETE_CLIENT_CLASS_COMMON(table_prefix, ...) \
+    "DELETE c FROM " #table_prefix "_client_class AS c " \
+    "INNER JOIN " #table_prefix "_client_class_server AS a" \
+    "  ON c.id = a.class_id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON a.server_id = s.id " \
+    #__VA_ARGS__
+
+#define MYSQL_DELETE_CLIENT_CLASS_WITH_TAG(table_prefix, ...) \
+    MYSQL_DELETE_CLIENT_CLASS_COMMON(table_prefix, WHERE s.tag = ? __VA_ARGS__)
+
+#define MYSQL_DELETE_CLIENT_CLASS_ANY(table_prefix, ...) \
+    MYSQL_DELETE_CLIENT_CLASS_COMMON(table_prefix, __VA_ARGS__)
+
+#define MYSQL_DELETE_CLIENT_CLASS_UNASSIGNED(table_prefix, ...) \
+    "DELETE c FROM " #table_prefix "_client_class AS c " \
+    "LEFT JOIN " #table_prefix "_client_class_server AS a" \
+    "  ON c.id = a.class_id " \
+    "WHERE a.class_id IS NULL " #__VA_ARGS__
+#endif
+
+#ifndef MYSQL_DELETE_SERVER
+#define MYSQL_DELETE_SERVER(table_prefix) \
+    "DELETE FROM " #table_prefix "_server " \
+    "WHERE tag = ?"
+#endif
+
+#ifndef MYSQL_DELETE_ALL_SERVERS
+#define MYSQL_DELETE_ALL_SERVERS(table_prefix) \
+    "DELETE FROM " #table_prefix "_server " \
+    "WHERE id > 1"
+#endif
+
+} // end of anonymous namespace
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
+
+#endif
diff --git a/src/hooks/dhcp/mysql_cb/tests/Makefile.am b/src/hooks/dhcp/mysql_cb/tests/Makefile.am
new file mode 100644
index 0000000..8f1d8cb
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/tests/Makefile.am
@@ -0,0 +1,64 @@
+SUBDIRS = .
+
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += -I$(top_builddir)/src/hooks/dhcp/mysql_cb -I$(top_srcdir)/src/hooks/dhcp/mysql_cb
+AM_CPPFLAGS += $(BOOST_INCLUDES) $(MYSQL_CPPFLAGS)
+AM_CPPFLAGS += -DINSTALL_PROG=\"$(abs_top_srcdir)/install-sh\"
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+# Unit test data files need to get installed.
+EXTRA_DIST =
+
+CLEANFILES = *.gcno *.gcda
+
+TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+TESTS =
+if HAVE_GTEST
+TESTS += mysql_cb_unittests
+
+mysql_cb_unittests_SOURCES  = mysql_cb_dhcp4_unittest.cc
+mysql_cb_unittests_SOURCES += mysql_cb_dhcp4_mgr_unittest.cc
+mysql_cb_unittests_SOURCES += mysql_cb_dhcp6_unittest.cc
+mysql_cb_unittests_SOURCES += mysql_cb_dhcp6_mgr_unittest.cc
+mysql_cb_unittests_SOURCES += mysql_cb_impl_unittest.cc
+mysql_cb_unittests_SOURCES += run_unittests.cc
+
+mysql_cb_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES) $(LOG4CPLUS_INCLUDES)
+
+mysql_cb_unittests_LDFLAGS  = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
+
+mysql_cb_unittests_CXXFLAGS = $(AM_CXXFLAGS)
+
+mysql_cb_unittests_LDADD  = $(top_builddir)/src/hooks/dhcp/mysql_cb/libmysqlcb.la
+mysql_cb_unittests_LDADD += $(top_builddir)/src/lib/dhcpsrv/testutils/libdhcpsrvtest.la
+mysql_cb_unittests_LDADD += $(top_builddir)/src/lib/dhcpsrv/libkea-dhcpsrv.la
+mysql_cb_unittests_LDADD += $(top_builddir)/src/lib/process/libkea-process.la
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/mysql_cb_unittests-mysql_cb_dhcp4_mgr_unittest.Po
+	-rm -f ./$(DEPDIR)/mysql_cb_unittests-mysql_cb_dhcp4_unittest.Po
+	-rm -f ./$(DEPDIR)/mysql_cb_unittests-mysql_cb_dhcp6_mgr_unittest.Po
+	-rm -f ./$(DEPDIR)/mysql_cb_unittests-mysql_cb_dhcp6_unittest.Po
+	-rm -f ./$(DEPDIR)/mysql_cb_unittests-mysql_cb_impl_unittest.Po
+	-rm -f ./$(DEPDIR)/mysql_cb_unittests-run_unittests.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/mysql_cb_unittests-mysql_cb_dhcp4_mgr_unittest.Po
+	-rm -f ./$(DEPDIR)/mysql_cb_unittests-mysql_cb_dhcp4_unittest.Po
+	-rm -f ./$(DEPDIR)/mysql_cb_unittests-mysql_cb_dhcp6_mgr_unittest.Po
+	-rm -f ./$(DEPDIR)/mysql_cb_unittests-mysql_cb_dhcp6_unittest.Po
+	-rm -f ./$(DEPDIR)/mysql_cb_unittests-mysql_cb_impl_unittest.Po
+	-rm -f ./$(DEPDIR)/mysql_cb_unittests-run_unittests.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: $(am__recursive_targets) check-am install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-TESTS check-am clean clean-generic \
+	clean-libtool clean-noinstPROGRAMS cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp4_mgr_unittest.cc b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp4_mgr_unittest.cc
new file mode 100644
index 0000000..fe94b55
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp4_mgr_unittest.cc
@@ -0,0 +1,88 @@
+// Copyright (C) 2018-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <cc/stamped_value.h>
+#include <dhcpsrv/config_backend_dhcp4_mgr.h>
+#include <mysql_cb_dhcp4.h>
+#include <mysql/testutils/mysql_schema.h>
+#include <dhcpsrv/testutils/generic_backend_unittest.h>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::dhcp::test;
+using namespace isc::db;
+using namespace isc::db::test;
+
+namespace {
+
+/// @brief Test fixture class for @c MySqlConfigBackendDHCPv4Mgr.
+class MySqlConfigBackendDHCPv4MgrTest : public GenericBackendTest {
+public:
+    /// @brief Constructor.
+    MySqlConfigBackendDHCPv4MgrTest() {
+        // Recreate a fresh mgr.
+        ConfigBackendDHCPv4Mgr::create();
+
+        // Ensure we have the proper schema with no transient data.
+        createMySQLSchema();
+    }
+
+    /// @brief Destructor.
+    virtual ~MySqlConfigBackendDHCPv4MgrTest() {
+        // Destroy the mgr.
+        ConfigBackendDHCPv4Mgr::destroy();
+
+        // If data wipe enabled, delete transient data otherwise destroy the schema.
+        destroyMySQLSchema();
+    }
+};
+
+// This test verifies that MySQL backend can be registered with and
+// unregistered from the Config Backend Manager.
+TEST_F(MySqlConfigBackendDHCPv4MgrTest, factoryRegistration) {
+
+    // Get the mgr singleton.
+    ConfigBackendDHCPv4Mgr& mgr = ConfigBackendDHCPv4Mgr::instance();
+
+    // With no factory registered, attempting to add a MySQL db should fail.
+    ASSERT_THROW(mgr.addBackend(validMySQLConnectionString()), InvalidType);
+
+    // Now we'll register the MySQL factory.
+    ASSERT_NO_THROW(MySqlConfigBackendDHCPv4::registerBackendType());
+
+    // With the factory registered, attempting to add a MySQL db should succeed.
+    ASSERT_NO_THROW(mgr.addBackend(validMySQLConnectionString()));
+
+    // Create a MySQL backend selector for convenience.
+    BackendSelector mysql(BackendSelector::Type::MYSQL);
+
+    // Should be able to create a global parameter.
+    StampedValuePtr server_tag = StampedValue::create("server-tag", "whale");
+    ASSERT_NO_THROW(mgr.getPool()->createUpdateGlobalParameter4(mysql, ServerSelector::ALL(),
+                                                                server_tag));
+    // Verify parameter can be fetched.
+    server_tag.reset();
+    ASSERT_NO_THROW(server_tag = mgr.getPool()->getGlobalParameter4(mysql, ServerSelector::ALL(),
+                                                                    "server-tag"));
+    ASSERT_TRUE(server_tag);
+    EXPECT_EQ("server-tag", server_tag->getName());
+    EXPECT_EQ("whale", server_tag->getValue());
+
+    // Now we'll unregister MySQL.
+    ASSERT_NO_THROW(MySqlConfigBackendDHCPv4::unregisterBackendType());
+
+    // With no factory registered, attempting to add a MySQL db should fail.
+    ASSERT_THROW(mgr.addBackend(validMySQLConnectionString()), InvalidType);
+
+    // Attempting to read the global parameter should fail.
+    ASSERT_THROW(mgr.getPool()->getGlobalParameter4(mysql, ServerSelector::ALL(), "server-tag"),
+                 NoSuchDatabase);
+}
+
+}
diff --git a/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp4_unittest.cc b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp4_unittest.cc
new file mode 100644
index 0000000..63d1f10
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp4_unittest.cc
@@ -0,0 +1,515 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <database/db_exceptions.h>
+#include <database/server.h>
+#include <database/testutils/schema.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <dhcpsrv/config_backend_dhcp4_mgr.h>
+#include <dhcpsrv/testutils/generic_cb_dhcp4_unittest.h>
+#include <dhcpsrv/testutils/generic_cb_recovery_unittest.h>
+#include <dhcpsrv/testutils/mysql_generic_backend_unittest.h>
+#include <dhcpsrv/testutils/test_utils.h>
+#include <mysql_cb_dhcp4.h>
+#include <mysql/testutils/mysql_schema.h>
+#include <testutils/multi_threading_utils.h>
+#include <testutils/gtest_utils.h>
+
+#include <boost/make_shared.hpp>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <mysql.h>
+#include <map>
+#include <sstream>
+
+using namespace isc;
+using namespace isc::asiolink;
+using namespace isc::db;
+using namespace isc::db::test;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::dhcp::test;
+using namespace isc::process;
+using namespace isc::test;
+using namespace isc::util;
+namespace ph = std::placeholders;
+
+namespace {
+
+/// @brief Test implementation of the MySQL configuration backend.
+///
+/// It exposes protected members of the @c MySqlConfigBackendDHCPv4.
+class TestMySqlConfigBackendDHCPv4 : public MySqlConfigBackendDHCPv4 {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit TestMySqlConfigBackendDHCPv4(const DatabaseConnection::ParameterMap& parameters)
+        : MySqlConfigBackendDHCPv4(parameters) {
+    }
+
+    using MySqlConfigBackendDHCPv4::base_impl_;
+};
+
+/// @brief Test fixture class for @c MySqlConfigBackendDHCPv4.
+class MySqlConfigBackendDHCPv4Test : public GenericConfigBackendDHCPv4Test {
+public:
+    /// @brief Constructor.
+    MySqlConfigBackendDHCPv4Test() {}
+
+    /// @brief Destructor.
+    virtual ~MySqlConfigBackendDHCPv4Test() {}
+
+    /// @brief Creates the MySQL back end schema
+    virtual void createSchema() {
+        createMySQLSchema();
+    }
+
+    /// @brief Destroys the MySQL back end schema
+    virtual void destroySchema() {
+        destroyMySQLSchema();
+    }
+
+    /// @brief Returns a valid MySQL back end specific connection
+    /// string
+    std::string validConnectionString() {
+        return (validMySQLConnectionString());
+    }
+
+    /// @brief Instantiates an instance of a MySQL DHCPv4 configuration
+    /// back end.
+    ///
+    /// @params Connection parameters describing the back end to create.
+    ///
+    /// @return Pointer to the newly created back end instance.
+    ConfigBackendDHCPv4Ptr backendFactory(db::DatabaseConnection::ParameterMap&
+                                          params) {
+
+        return (ConfigBackendDHCPv4Ptr(new TestMySqlConfigBackendDHCPv4(params)));
+    }
+
+    /// @brief Counts rows in a selected table in MySQL database.
+    ///
+    /// This method can be used to verify that some configuration elements were
+    /// deleted from a selected table as a result of cascade delete or a trigger.
+    /// For example, deleting a subnet should trigger deletion of its address
+    /// pools and options. By counting the rows on each table we can determine
+    /// whether the deletion took place on all tables for which it was expected.
+    ///
+    /// @param table Table name.
+    /// @return Number of rows in the specified table.
+    size_t countRows(const std::string& table) const {
+        auto p = boost::dynamic_pointer_cast<TestMySqlConfigBackendDHCPv4>(cbptr_);
+        if (!p) {
+            ADD_FAILURE() << "cbptr_ does not cast to TestMySqlConfigBackendDHCPv4";
+            return (0);
+        }
+
+        // Reuse the existing connection of the backend.
+        auto impl = boost::dynamic_pointer_cast<MySqlConfigBackendImpl>(p->base_impl_);
+        auto& conn = impl->conn_;
+
+        return (MySqlGenericBackendTest::countRows(conn, table));
+    }
+};
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getType) {
+    getTypeTest("mysql");
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getHost) {
+    getHostTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getPort) {
+    getPortTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, createUpdateDeleteServerTest) {
+    createUpdateDeleteServerTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getAndDeleteAllServersTest) {
+    getAndDeleteAllServersTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, createUpdateDeleteGlobalParameter4Test) {
+    createUpdateDeleteGlobalParameter4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, globalParameters4WithServerTagsTest) {
+    globalParameters4WithServerTagsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getAllGlobalParameters4Test) {
+    getAllGlobalParameters4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getModifiedGlobalParameters4Test) {
+    getModifiedGlobalParameters4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, nullKeyErrorTest) {
+    nullKeyErrorTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, createUpdateSubnet4SelectorsTest) {
+    createUpdateSubnet4SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getSubnet4Test) {
+    getSubnet4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getSubnet4byIdSelectorsTest) {
+    getSubnet4byIdSelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getSubnet4WithOptionalUnspecifiedTest) {
+    getSubnet4WithOptionalUnspecifiedTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getSubnet4SharedNetworkTest) {
+    getSubnet4SharedNetworkTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getSubnet4ByPrefixTest) {
+    getSubnet4ByPrefixTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getSubnet4byPrefixSelectorsTest) {
+    getSubnet4byPrefixSelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getAllSubnets4Test) {
+    getAllSubnets4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getAllSubnets4SelectorsTest) {
+    getAllSubnets4SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getAllSubnets4WithServerTagsTest) {
+    getAllSubnets4WithServerTagsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getModifiedSubnets4SelectorsTest) {
+    getModifiedSubnets4SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, deleteSubnet4Test) {
+    deleteSubnet4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, deleteSubnet4ByIdSelectorsTest) {
+    deleteSubnet4ByIdSelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, deleteSubnet4ByPrefixSelectorsTest) {
+    deleteSubnet4ByPrefixSelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, deleteAllSubnets4SelectorsTest) {
+    deleteAllSubnets4SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, unassignedSubnet4Test) {
+    unassignedSubnet4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getModifiedSubnets4Test) {
+    getModifiedSubnets4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, subnetLifetimeTest) {
+    subnetLifetimeTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getSharedNetworkSubnets4Test) {
+    getSharedNetworkSubnets4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, subnetUpdatePoolsTest) {
+    subnetUpdatePoolsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, subnetOptionsTest) {
+    subnetOptionsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getSharedNetwork4Test) {
+    getSharedNetwork4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getSharedNetwork4SelectorsTest) {
+    getSharedNetwork4SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, createUpdateSharedNetwork4Test) {
+    createUpdateSharedNetwork4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, createUpdateSharedNetwork4SelectorsTest) {
+    createUpdateSharedNetwork4SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getSharedNetwork4WithOptionalUnspecifiedTest) {
+    getSharedNetwork4WithOptionalUnspecifiedTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, deleteSharedNetworkSubnets4Test) {
+    deleteSharedNetworkSubnets4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getAllSharedNetworks4Test) {
+    getAllSharedNetworks4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getAllSharedNetworks4SelectorsTest) {
+    getAllSharedNetworks4SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getAllSharedNetworks4WithServerTagsTest) {
+    getAllSharedNetworks4WithServerTagsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getModifiedSharedNetworks4Test) {
+    getModifiedSharedNetworks4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getModifiedSharedNetworks4SelectorsTest) {
+    getModifiedSharedNetworks4SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, deleteSharedNetwork4Test) {
+    deleteSharedNetwork4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, deleteSharedNetwork4SelectorsTest) {
+    deleteSharedNetwork4SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, deleteAllSharedNetworks4SelectorsTest) {
+    deleteAllSharedNetworks4SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, unassignedSharedNetworkTest) {
+    unassignedSharedNetworkTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, sharedNetworkLifetimeTest) {
+    sharedNetworkLifetimeTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, sharedNetworkOptionsTest) {
+    sharedNetworkOptionsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getOptionDef4Test) {
+    getOptionDef4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, optionDefs4WithServerTagsTest) {
+    optionDefs4WithServerTagsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getAllOptionDefs4Test) {
+    getAllOptionDefs4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getModifiedOptionDefs4Test) {
+    getModifiedOptionDefs4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, createUpdateDeleteOption4Test) {
+    createUpdateDeleteOption4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, globalOptions4WithServerTagsTest) {
+    globalOptions4WithServerTagsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getAllOptions4Test) {
+    getAllOptions4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getModifiedOptions4Test) {
+    getModifiedOptions4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, createUpdateDeleteSubnetOption4Test) {
+    createUpdateDeleteSubnetOption4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, createUpdateDeletePoolOption4Test) {
+    createUpdateDeletePoolOption4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, createUpdateDeleteSharedNetworkOption4Test) {
+    createUpdateDeleteSharedNetworkOption4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, subnetOptionIdOrderTest) {
+    subnetOptionIdOrderTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, sharedNetworkOptionIdOrderTest) {
+    sharedNetworkOptionIdOrderTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, setAndGetAllClientClasses4Test) {
+    setAndGetAllClientClasses4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getClientClass4Test) {
+    getClientClass4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, createUpdateClientClass4OptionsTest) {
+    createUpdateClientClass4OptionsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, getModifiedClientClasses4Test) {
+    getModifiedClientClasses4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, deleteClientClass4Test) {
+    deleteClientClass4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, deleteAllClientClasses4Test) {
+    deleteAllClientClasses4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, clientClassDependencies4Test) {
+    clientClassDependencies4Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4Test, multipleAuditEntriesTest) {
+    multipleAuditEntriesTest();
+}
+
+/// @brief Test fixture for verifying database connection loss-recovery
+/// behavior.
+class MySqlConfigBackendDHCPv4DbLostCallbackTest : public GenericConfigBackendDbLostCallbackTest {
+public:
+    /// @brief Constructor
+    MySqlConfigBackendDHCPv4DbLostCallbackTest() {};
+
+    /// @brief Destructor
+    virtual ~MySqlConfigBackendDHCPv4DbLostCallbackTest() {};
+
+    /// @brief Creates the MySQL CB schema.
+    virtual void createSchema() {
+        createMySQLSchema();
+    }
+
+    /// @brief Destroys the MySQL CB schema.
+    virtual void destroySchema() {
+        destroyMySQLSchema();
+    }
+
+    /// @brief Method which returns a valid back end specific connection
+    /// string
+    virtual std::string validConnectionString() {
+        return (validMySQLConnectionString());
+    }
+
+    /// @brief Method which returns an invalid back end specific connection
+    /// string.
+    virtual std::string invalidConnectionString() {
+        return (connectionString(MYSQL_VALID_TYPE, INVALID_NAME, VALID_HOST,
+                                 VALID_USER, VALID_PASSWORD));
+    }
+
+    /// @brief Registers MySQL as a CB backend type.
+    virtual void registerBackendType() {
+        isc::dhcp::MySqlConfigBackendDHCPv4::registerBackendType();
+    }
+
+    /// @brief Unregisters MySQL as a CB backend type.
+    virtual void unregisterBackendType() {
+        isc::dhcp::MySqlConfigBackendDHCPv4::unregisterBackendType();
+    }
+
+    /// @brief Sets the IOService instance in the CB implementation object.
+    ///
+    /// @param io_service pointer to the IOService instance to use. It may be
+    /// an empty pointer.
+    virtual void setConfigBackendImplIOService(isc::asiolink::IOServicePtr io_service) {
+        isc::dhcp::MySqlConfigBackendImpl::setIOService(io_service);
+    }
+
+    /// @brief  Attempts to add a backend instance to the CB manager.
+    ///
+    /// @param access Connection access string containing the database
+    /// connection parameters.
+    virtual void addBackend(const std::string& access) {
+        ConfigBackendDHCPv4Mgr::instance().addBackend(access);
+    }
+
+    /// @brief Fetches a collection of all the servers currently in
+    /// the CB database.  This function is used to check the operability
+    /// of the CB backend.
+    ServerCollection getAllServers() {
+        return (ConfigBackendDHCPv4Mgr::instance().getPool()->getAllServers4(BackendSelector()));
+    }
+};
+
+TEST_F(MySqlConfigBackendDHCPv4DbLostCallbackTest, testNoCallbackOnOpenFailure) {
+    MultiThreadingTest mt(false);
+    testNoCallbackOnOpenFailure();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4DbLostCallbackTest, testNoCallbackOnOpenFailureMultiThreading) {
+    MultiThreadingTest mt(true);
+    testNoCallbackOnOpenFailure();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndRecoveredCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndRecoveredCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndRecoveredCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndRecoveredCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndFailedCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndFailedCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndFailedCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndFailedCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndRecoveredAfterTimeoutCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndRecoveredAfterTimeoutCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndRecoveredAfterTimeoutCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndRecoveredAfterTimeoutCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndFailedAfterTimeoutCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndFailedAfterTimeoutCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndFailedAfterTimeoutCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndFailedAfterTimeoutCallback();
+}
+
+}
diff --git a/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp6_mgr_unittest.cc b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp6_mgr_unittest.cc
new file mode 100644
index 0000000..fe1252f
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp6_mgr_unittest.cc
@@ -0,0 +1,88 @@
+// Copyright (C) 2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <cc/stamped_value.h>
+#include <dhcpsrv/config_backend_dhcp6_mgr.h>
+#include <mysql_cb_dhcp6.h>
+#include <mysql/testutils/mysql_schema.h>
+#include <dhcpsrv/testutils/generic_backend_unittest.h>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::dhcp::test;
+using namespace isc::db;
+using namespace isc::db::test;
+
+namespace {
+
+/// @brief Test fixture class for @c MySqlConfigBackendDHCPv6Mgr.
+class MySqlConfigBackendDHCPv6MgrTest : public GenericBackendTest {
+public:
+    /// @brief Constructor.
+    MySqlConfigBackendDHCPv6MgrTest() {
+        // Recreate a fresh mgr.
+        ConfigBackendDHCPv6Mgr::create();
+
+        // Ensure we have the proper schema with no transient data.
+        createMySQLSchema();
+    }
+
+    /// @brief Destructor.
+    virtual ~MySqlConfigBackendDHCPv6MgrTest() {
+        // Destroy the mgr.
+        ConfigBackendDHCPv6Mgr::destroy();
+
+        // If data wipe enabled, delete transient data otherwise destroy the schema.
+        destroyMySQLSchema();
+    }
+};
+
+// This test verifies that MySQL backend can be registered with and
+// unregistered from the Config Backend Manager.
+TEST_F(MySqlConfigBackendDHCPv6MgrTest, factoryRegistration) {
+
+    // Get the mgr singleton.
+    ConfigBackendDHCPv6Mgr& mgr = ConfigBackendDHCPv6Mgr::instance();
+
+    // With no factory registered, attempting to add a MySQL db should fail.
+    ASSERT_THROW(mgr.addBackend(validMySQLConnectionString()), InvalidType);
+
+    // Now we'll register the MySQL factory.
+    ASSERT_NO_THROW(MySqlConfigBackendDHCPv6::registerBackendType());
+
+    // With the factory registered, attempting to add a MySQL db should succeed.
+    ASSERT_NO_THROW(mgr.addBackend(validMySQLConnectionString()));
+
+    // Create a MySQL backend selector for convenience.
+    BackendSelector mysql(BackendSelector::Type::MYSQL);
+
+    // Should be able to create a global parameter.
+    StampedValuePtr server_tag = StampedValue::create("server-tag", "whale");
+    ASSERT_NO_THROW(mgr.getPool()->createUpdateGlobalParameter6(mysql, ServerSelector::ALL(),
+                                                                server_tag));
+    // Verify parameter can be fetched.
+    server_tag.reset();
+    ASSERT_NO_THROW(server_tag = mgr.getPool()->getGlobalParameter6(mysql, ServerSelector::ALL(),
+                                                                    "server-tag"));
+    ASSERT_TRUE(server_tag);
+    EXPECT_EQ("server-tag", server_tag->getName());
+    EXPECT_EQ("whale", server_tag->getValue());
+
+    // Now we'll unregister MySQL.
+    ASSERT_NO_THROW(MySqlConfigBackendDHCPv6::unregisterBackendType());
+
+    // With no factory registered, attempting to add a MySQL db should fail.
+    ASSERT_THROW(mgr.addBackend(validMySQLConnectionString()), InvalidType);
+
+    // Attempting to read the global parameter should fail.
+    ASSERT_THROW(mgr.getPool()->getGlobalParameter6(mysql, ServerSelector::ALL(), "server-tag"),
+                 NoSuchDatabase);
+}
+
+}
diff --git a/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp6_unittest.cc b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp6_unittest.cc
new file mode 100644
index 0000000..73d8891
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp6_unittest.cc
@@ -0,0 +1,519 @@
+// Copyright (C) 2019-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <database/db_exceptions.h>
+#include <database/server.h>
+#include <database/testutils/schema.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <dhcpsrv/config_backend_dhcp6_mgr.h>
+#include <dhcpsrv/testutils/generic_cb_dhcp6_unittest.h>
+#include <dhcpsrv/testutils/generic_cb_recovery_unittest.h>
+#include <dhcpsrv/testutils/mysql_generic_backend_unittest.h>
+#include <dhcpsrv/testutils/test_utils.h>
+#include <mysql_cb_dhcp6.h>
+#include <mysql/testutils/mysql_schema.h>
+#include <testutils/multi_threading_utils.h>
+#include <testutils/gtest_utils.h>
+
+#include <boost/make_shared.hpp>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <mysql.h>
+#include <map>
+#include <sstream>
+
+using namespace isc;
+using namespace isc::asiolink;
+using namespace isc::db;
+using namespace isc::db::test;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::dhcp::test;
+using namespace isc::process;
+using namespace isc::test;
+using namespace isc::util;
+namespace ph = std::placeholders;
+
+namespace {
+
+/// @brief Test implementation of the MySQL configuration backend.
+///
+/// It exposes protected members of the @c MySqlConfigBackendDHCPv6.
+class TestMySqlConfigBackendDHCPv6 : public MySqlConfigBackendDHCPv6 {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit TestMySqlConfigBackendDHCPv6(const DatabaseConnection::ParameterMap& parameters)
+        : MySqlConfigBackendDHCPv6(parameters) {
+    }
+
+    using MySqlConfigBackendDHCPv6::base_impl_;
+};
+
+/// @brief Test fixture class for @c MySqlConfigBackendDHCPv6.
+class MySqlConfigBackendDHCPv6Test : public GenericConfigBackendDHCPv6Test {
+public:
+    /// @brief Constructor.
+    MySqlConfigBackendDHCPv6Test() {}
+
+    /// @brief Destructor.
+    virtual ~MySqlConfigBackendDHCPv6Test() {}
+
+    /// @brief Creates the MySQL back end schema
+    virtual void createSchema() {
+        createMySQLSchema();
+    }
+
+    /// @brief Destroys the MySQL back end schema
+    virtual void destroySchema() {
+        destroyMySQLSchema();
+    }
+
+    /// @brief Returns a valid MySQL back end specific connection
+    /// string
+    std::string validConnectionString() {
+        return (validMySQLConnectionString());
+    }
+
+    /// @brief Instantiates an instance of a MySQL DHCPv6 configuration
+    /// back end.
+    ///
+    /// @params Connection parameters describing the back end to create.
+    ///
+    /// @return Pointer to the newly created back end instance.
+    ConfigBackendDHCPv6Ptr backendFactory(db::DatabaseConnection::ParameterMap&
+                                          params) {
+
+        return (ConfigBackendDHCPv6Ptr(new TestMySqlConfigBackendDHCPv6(params)));
+    }
+
+    /// @brief Counts rows in a selected table in MySQL database.
+    ///
+    /// This method can be used to verify that some configuration elements were
+    /// deleted from a selected table as a result of cascade delete or a trigger.
+    /// For example, deleting a subnet should trigger deletion of its address
+    /// pools and options. By counting the rows on each table we can determine
+    /// whether the deletion took place on all tables for which it was expected.
+    ///
+    /// @param table Table name.
+    /// @return Number of rows in the specified table.
+    size_t countRows(const std::string& table) const {
+        auto p = boost::dynamic_pointer_cast<TestMySqlConfigBackendDHCPv6>(cbptr_);
+        if (!p) {
+            ADD_FAILURE() << "cbptr_ does not cast to TestMySqlConfigBackendDHCPv6";
+            return (0);
+        }
+
+        // Reuse the existing connection of the backend.
+        auto impl = boost::dynamic_pointer_cast<MySqlConfigBackendImpl>(p->base_impl_);
+        auto& conn = impl->conn_;
+
+        return (MySqlGenericBackendTest::countRows(conn, table));
+    }
+};
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getType) {
+    getTypeTest("mysql");
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getHost) {
+    getHostTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getPort) {
+    getPortTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, createUpdateDeleteServerTest) {
+    createUpdateDeleteServerTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getAndDeleteAllServersTest) {
+    getAndDeleteAllServersTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, createUpdateDeleteGlobalParameter6Test) {
+    createUpdateDeleteGlobalParameter6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, globalParameters6WithServerTagsTest) {
+    globalParameters6WithServerTagsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getAllGlobalParameters6Test) {
+    getAllGlobalParameters6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getModifiedGlobalParameters6Test) {
+    getModifiedGlobalParameters6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, nullKeyErrorTest) {
+    nullKeyErrorTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, createUpdateSubnet6SelectorsTest) {
+    createUpdateSubnet6SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getSubnet6Test) {
+    getSubnet6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getSubnet6byIdSelectorsTest) {
+    getSubnet6byIdSelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getSubnet6WithOptionalUnspecifiedTest) {
+    getSubnet6WithOptionalUnspecifiedTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getSubnet6SharedNetworkTest) {
+    getSubnet6SharedNetworkTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getSubnet6ByPrefixTest) {
+    getSubnet6ByPrefixTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getSubnet6byPrefixSelectorsTest) {
+    getSubnet6byPrefixSelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getAllSubnets6Test) {
+    getAllSubnets6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getAllSubnets6SelectorsTest) {
+    getAllSubnets6SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getAllSubnets6WithServerTagsTest) {
+    getAllSubnets6WithServerTagsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getModifiedSubnets6SelectorsTest) {
+    getModifiedSubnets6SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, deleteSubnet6Test) {
+    deleteSubnet6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, deleteSubnet6ByIdSelectorsTest) {
+    deleteSubnet6ByIdSelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, deleteSubnet6ByPrefixSelectorsTest) {
+    deleteSubnet6ByPrefixSelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, deleteAllSubnets6SelectorsTest) {
+    deleteAllSubnets6SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, unassignedSubnet6Test) {
+    unassignedSubnet6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getModifiedSubnets6Test) {
+    getModifiedSubnets6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, subnetLifetimeTest) {
+    subnetLifetimeTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getSharedNetworkSubnets6Test) {
+    getSharedNetworkSubnets6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, subnetUpdatePoolsTest) {
+    subnetUpdatePoolsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, subnetOptionsTest) {
+    subnetOptionsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getSharedNetwork6Test) {
+    getSharedNetwork6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getSharedNetwork6SelectorsTest) {
+    getSharedNetwork6SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, createUpdateSharedNetwork6Test) {
+    createUpdateSharedNetwork6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, createUpdateSharedNetwork6SelectorsTest) {
+    createUpdateSharedNetwork6SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getSharedNetwork6WithOptionalUnspecifiedTest) {
+    getSharedNetwork6WithOptionalUnspecifiedTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, deleteSharedNetworkSubnets6Test) {
+    deleteSharedNetworkSubnets6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getAllSharedNetworks6Test) {
+    getAllSharedNetworks6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getAllSharedNetworks6SelectorsTest) {
+    getAllSharedNetworks6SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getAllSharedNetworks6WithServerTagsTest) {
+    getAllSharedNetworks6WithServerTagsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getModifiedSharedNetworks6Test) {
+    getModifiedSharedNetworks6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getModifiedSharedNetworks6SelectorsTest) {
+    getModifiedSharedNetworks6SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, deleteSharedNetwork6Test) {
+    deleteSharedNetwork6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, deleteSharedNetwork6SelectorsTest) {
+    deleteSharedNetwork6SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, deleteAllSharedNetworks6SelectorsTest) {
+    deleteAllSharedNetworks6SelectorsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, unassignedSharedNetworkTest) {
+    unassignedSharedNetworkTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, sharedNetworkLifetimeTest) {
+    sharedNetworkLifetimeTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, sharedNetworkOptionsTest) {
+    sharedNetworkOptionsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getOptionDef6Test) {
+    getOptionDef6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, optionDefs6WithServerTagsTest) {
+    optionDefs6WithServerTagsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getAllOptionDefs6Test) {
+    getAllOptionDefs6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getModifiedOptionDefs6Test) {
+    getModifiedOptionDefs6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, createUpdateDeleteOption6Test) {
+    createUpdateDeleteOption6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, globalOptions6WithServerTagsTest) {
+    globalOptions6WithServerTagsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getAllOptions6Test) {
+    getAllOptions6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getModifiedOptions6Test) {
+    getModifiedOptions6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, createUpdateDeleteSubnetOption6Test) {
+    createUpdateDeleteSubnetOption6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, createUpdateDeletePoolOption6Test) {
+    createUpdateDeletePoolOption6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, createUpdateDeletePdPoolOption6Test) {
+    createUpdateDeletePdPoolOption6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, createUpdateDeleteSharedNetworkOption6Test) {
+    createUpdateDeleteSharedNetworkOption6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, subnetOptionIdOrderTest) {
+    subnetOptionIdOrderTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, sharedNetworkOptionIdOrderTest) {
+    sharedNetworkOptionIdOrderTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, setAndGetAllClientClasses6Test) {
+    setAndGetAllClientClasses6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getClientClass6Test) {
+    getClientClass6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, createUpdateClientClass6OptionsTest) {
+    createUpdateClientClass6OptionsTest();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, getModifiedClientClasses6Test) {
+    getModifiedClientClasses6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, deleteClientClass6Test) {
+    deleteClientClass6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, deleteAllClientClasses6Test) {
+    deleteAllClientClasses6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, clientClassDependencies6Test) {
+    clientClassDependencies6Test();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6Test, multipleAuditEntriesTest) {
+    multipleAuditEntriesTest();
+}
+
+/// @brief Test fixture for verifying database connection loss-recovery
+/// behavior.
+class MySqlConfigBackendDHCPv6DbLostCallbackTest : public GenericConfigBackendDbLostCallbackTest {
+public:
+    /// @brief Constructor
+    MySqlConfigBackendDHCPv6DbLostCallbackTest() {};
+
+    /// @brief Destructor
+    virtual ~MySqlConfigBackendDHCPv6DbLostCallbackTest() {};
+
+    /// @brief Creates the MySQL CB schema.
+    virtual void createSchema() {
+        createMySQLSchema();
+    }
+
+    /// @brief Destroys the MySQL CB schema.
+    virtual void destroySchema() {
+        destroyMySQLSchema();
+    }
+
+    /// @brief Method which returns a valid back end specific connection
+    /// string
+    virtual std::string validConnectionString() {
+        return (validMySQLConnectionString());
+    }
+
+    /// @brief Method which returns an invalid back end specific connection
+    /// string.
+    virtual std::string invalidConnectionString() {
+        return (connectionString(MYSQL_VALID_TYPE, INVALID_NAME, VALID_HOST,
+                                 VALID_USER, VALID_PASSWORD));
+    }
+
+    /// @brief Registers MySQL as a CB backend type.
+    virtual void registerBackendType() {
+        isc::dhcp::MySqlConfigBackendDHCPv6::registerBackendType();
+    }
+
+    /// @brief Unregisters MySQL as a CB backend type.
+    virtual void unregisterBackendType() {
+        isc::dhcp::MySqlConfigBackendDHCPv6::unregisterBackendType();
+    }
+
+    /// @brief Sets the IOService instance in the CB implementation object.
+    ///
+    /// @param io_service pointer to the IOService instance to use. It may be
+    /// an empty pointer.
+    virtual void setConfigBackendImplIOService(isc::asiolink::IOServicePtr io_service) {
+        isc::dhcp::MySqlConfigBackendImpl::setIOService(io_service);
+    }
+
+    /// @brief  Attempts to add a backend instance to the CB manager.
+    ///
+    /// @param access Connection access string containing the database
+    /// connection parameters.
+    virtual void addBackend(const std::string& access) {
+        ConfigBackendDHCPv6Mgr::instance().addBackend(access);
+    }
+
+    /// @brief Fetches a collection of all the servers currently in
+    /// the CB database.  This function is used to check the operability
+    /// of the CB backend.
+    ServerCollection getAllServers() {
+        return (ConfigBackendDHCPv6Mgr::instance().getPool()->getAllServers6(BackendSelector()));
+    }
+};
+
+TEST_F(MySqlConfigBackendDHCPv6DbLostCallbackTest, testNoCallbackOnOpenFailure) {
+    MultiThreadingTest mt(false);
+    testNoCallbackOnOpenFailure();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6DbLostCallbackTest, testNoCallbackOnOpenFailureMultiThreading) {
+    MultiThreadingTest mt(true);
+    testNoCallbackOnOpenFailure();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndRecoveredCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndRecoveredCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndRecoveredCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndRecoveredCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndFailedCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndFailedCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndFailedCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndFailedCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndRecoveredAfterTimeoutCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndRecoveredAfterTimeoutCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndRecoveredAfterTimeoutCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndRecoveredAfterTimeoutCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndFailedAfterTimeoutCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndFailedAfterTimeoutCallback();
+}
+
+TEST_F(MySqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndFailedAfterTimeoutCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndFailedAfterTimeoutCallback();
+}
+
+}
diff --git a/src/hooks/dhcp/mysql_cb/tests/mysql_cb_impl_unittest.cc b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_impl_unittest.cc
new file mode 100644
index 0000000..b25f047
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_impl_unittest.cc
@@ -0,0 +1,60 @@
+// Copyright (C) 2019-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <mysql_cb_impl.h>
+#include <gtest/gtest.h>
+
+using namespace isc::db;
+using namespace isc::dhcp;
+using namespace isc::util;
+
+namespace {
+
+// Test that the MySQL binding can be created from a triplet.
+TEST(MySqlConfigBackendImplTest, createBindingFromTriplet) {
+    // Create a binding from an unspecified triplet.
+    auto binding = MySqlConfigBackendImpl::createBinding(Triplet<uint32_t>());
+    // The binding pointer should be non-null but the type of the binding
+    // should be null.
+    ASSERT_TRUE(binding);
+    EXPECT_TRUE(binding->amNull());
+
+    // This time create a triplet encapsulating a number.
+    binding = MySqlConfigBackendImpl::createBinding(Triplet<uint32_t>(123));
+    ASSERT_TRUE(binding);
+    // The binding type should be non-null.
+    ASSERT_FALSE(binding->amNull());
+    ASSERT_EQ(MYSQL_TYPE_LONG, binding->getType());
+    // Check that the correct value was stored in the binding.
+    EXPECT_EQ(123, binding->getInteger<uint32_t>());
+}
+
+// Test that the triplet can be created from the MySQL binding.
+TEST(MySqlConfigBackendImplTest, createTripletFromBinding) {
+    // Create a binding encapsulating a number and try to create a triplet
+    // from this binding.
+    MySqlBindingPtr binding = MySqlBinding::createInteger<uint32_t>(234);
+    Triplet<uint32_t> triplet;
+    ASSERT_NO_THROW(triplet = MySqlConfigBackendImpl::createTriplet(binding));
+
+    // The triplet should be specified and equal to the value stored in the
+    // binding.
+    ASSERT_FALSE(triplet.unspecified());
+    EXPECT_EQ(234, triplet.get());
+
+    // Create a null binding and then use it to create a triplet.
+    binding = MySqlBinding::createNull();
+    ASSERT_NO_THROW(triplet = MySqlConfigBackendImpl::createTriplet(binding));
+    // This time the triplet should be unspecified.
+    EXPECT_TRUE(triplet.unspecified());
+
+    // Finally, make sure that the null binding pointer is rejected.
+    EXPECT_THROW(MySqlConfigBackendImpl::createTriplet(MySqlBindingPtr()),
+                 isc::Unexpected);
+}
+
+}  // namespace
diff --git a/src/hooks/dhcp/mysql_cb/tests/run_unittests.cc b/src/hooks/dhcp/mysql_cb/tests/run_unittests.cc
new file mode 100644
index 0000000..6ec23da
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/tests/run_unittests.cc
@@ -0,0 +1,20 @@
+// Copyright (C) 2017-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <log/logger_support.h>
+
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+    isc::log::initLogger();
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/hooks/dhcp/mysql_cb/version.cc b/src/hooks/dhcp/mysql_cb/version.cc
new file mode 100644
index 0000000..8f9df4f
--- /dev/null
+++ b/src/hooks/dhcp/mysql_cb/version.cc
@@ -0,0 +1,18 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <hooks/hooks.h>
+
+extern "C" {
+
+/// @brief returns Kea hooks version.
+int version() {
+    return (KEA_HOOKS_VERSION);
+}
+
+}