Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 170 insertions, 0 deletions

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+PPoossttffiixx BBeerrkkeelleeyy DDBB HHoowwttoo
+
+-------------------------------------------------------------------------------
+
+IInnttrroodduuccttiioonn
+
+Postfix uses databases of various kinds to store and look up information.
+Postfix databases are specified as "type:name". Berkeley DB implements the
+Postfix database type "hash" and "btree". The name of a Postfix Berkeley DB
+database is the name of the database file without the ".db" suffix. Berkeley DB
+databases are maintained with the postmap(1) command.
+
+Note: Berkeley DB version 4 is not supported by Postfix versions before 2.0.
+
+This document describes:
+
+ 1. How to build Postfix without Berkeley DB support even if the system comes
+    with Berkeley DB.
+
+ 2. How to build Postfix on systems that normally have no Berkeley DB library.
+
+ 3. How to build Postfix on BSD or Linux systems with multiple Berkeley DB
+    versions.
+
+ 4. How to tweak performance.
+
+ 5. Missing pthread library trouble.
+
+BBuuiillddiinngg PPoossttffiixx wwiitthhoouutt BBeerrkkeelleeyy DDBB ssuuppppoorrtt eevveenn iiff tthhee ssyysstteemm ccoommeess wwiitthh
+BBeerrkkeelleeyy DDBB
+
+Note: The following instructions apply to Postfix 2.9 and later.
+
+Postfix will normally enable Berkeley DB support if the system is known to have
+it. To build Postfix without Berkeley DB support, build the makefiles as
+follows:
+
+    % make makefiles CCARGS="-DNO_DB"
+    % make
+
+This will disable support for "hash" and "btree" files.
+
+BBuuiillddiinngg PPoossttffiixx oonn ssyysstteemmss tthhaatt nnoorrmmaallllyy hhaavvee nnoo BBeerrkkeelleeyy DDBB lliibbrraarryy
+
+Some UNIXes ship without Berkeley DB support; for historical reasons these use
+DBM files instead. A problem with DBM files is that they can store only limited
+amounts of data. To build Postfix with Berkeley DB support you need to download
+and install the source code from http://www.oracle.com/database/berkeley-db/.
+
+Warning: some Linux system libraries use Berkeley DB, as do some third-party
+libraries such as SASL. If you compile Postfix with a different Berkeley DB
+implementation, then every Postfix program will dump core because either the
+system library, the SASL library, or Postfix itself ends up using the wrong
+version.
+
+The more recent Berkeley DB versions have a compile-time switch, "--with-
+uniquename", which renames the symbols so that multiple versions of Berkeley DB
+can co-exist in the same application. Although wasteful, this may be the only
+way to keep things from falling apart.
+
+To build Postfix after you installed the Berkeley DB from source code, use
+something like:
+
+    % make makefiles CCARGS="-DHAS_DB -I/usr/local/BerkeleyDB/include" \
+        AUXLIBS="-L/usr/local/BerkeleyDB/lib -ldb"
+    % make
+
+Solaris needs this:
+
+    % make makefiles CCARGS="-DHAS_DB -I/usr/local/BerkeleyDB/include" \
+        AUXLIBS="-R/usr/local/BerkeleyDB/lib -L/usr/local/BerkeleyDB/lib -ldb"
+    % make
+
+The exact pathnames depend on the Berkeley DB version, and on how it was
+installed.
+
+Warning: the file format produced by Berkeley DB version 1 is not compatible
+with that of versions 2 and 3 (versions 2 and 3 have the same format). If you
+switch between DB versions, then you may have to rebuild all your Postfix DB
+files.
+
+Warning: if you use Berkeley DB version 2 or later, do not enable DB 1.85
+compatibility mode. Doing so would break fcntl file locking.
+
+Warning: if you use Perl to manipulate Postfix's Berkeley DB files, then you
+need to use the same Berkeley DB version in Perl as in Postfix.
+
+BBuuiillddiinngg PPoossttffiixx oonn BBSSDD ssyysstteemmss wwiitthh mmuullttiippllee BBeerrkkeelleeyy DDBB vveerrssiioonnss
+
+Some BSD systems ship with multiple Berkeley DB implementations. Normally,
+Postfix builds with the default DB version that ships with the system.
+
+To build Postfix on BSD systems with a non-default DB version, use a variant of
+the following commands:
+
+    % make makefiles CCARGS=-I/usr/include/db3 AUXLIBS=-ldb3
+    % make
+
+Warning: the file format produced by Berkeley DB version 1 is not compatible
+with that of versions 2 and 3 (versions 2 and 3 have the same format). If you
+switch between DB versions, then you may have to rebuild all your Postfix DB
+files.
+
+Warning: if you use Berkeley DB version 2 or later, do not enable DB 1.85
+compatibility mode. Doing so would break fcntl file locking.
+
+Warning: if you use Perl to manipulate Postfix's Berkeley DB files, then you
+need to use the same Berkeley DB version in Perl as in Postfix.
+
+BBuuiillddiinngg PPoossttffiixx oonn LLiinnuuxx ssyysstteemmss wwiitthh mmuullttiippllee BBeerrkkeelleeyy DDBB vveerrssiioonnss
+
+Some Linux systems ship with multiple Berkeley DB implementations. Normally,
+Postfix builds with the default DB version that ships with the system.
+
+Warning: some Linux system libraries use Berkeley DB. If you compile Postfix
+with a non-default Berkeley DB implementation, then every Postfix program will
+dump core because either the system library or Postfix itself ends up using the
+wrong version.
+
+On Linux, you need to edit the makedefs script in order to specify a non-
+default DB library. The reason is that the location of the default db.h include
+file changes randomly between vendors and between versions, so that Postfix has
+to choose the file for you.
+
+Warning: the file format produced by Berkeley DB version 1 is not compatible
+with that of versions 2 and 3 (versions 2 and 3 have the same format). If you
+switch between DB versions, then you may have to rebuild all your Postfix DB
+files.
+
+Warning: if you use Berkeley DB version 2 or later, do not enable DB 1.85
+compatibility mode. Doing so would break fcntl file locking.
+
+Warning: if you use Perl to manipulate Postfix's Berkeley DB files, then you
+need to use the same Berkeley DB version in Perl as in Postfix.
+
+TTwweeaakkiinngg ppeerrffoorrmmaannccee
+
+Postfix provides two configuration parameters that control how much buffering
+memory Berkeley DB will use.
+
+  * berkeley_db_create_buffer_size (default: 16 MBytes per table). This setting
+    is used by the commands that maintain Berkeley DB files: postalias(1) and
+    postmap(1). For "hash" files, create performance degrades rapidly unless
+    the memory pool is O(file size). For "btree" files, create performance is
+    good with sorted input even for small memory pools, but with random input
+    degrades rapidly unless the memory pool is O(file size).
+
+  * berkeley_db_read_buffer_size (default: 128 kBytes per table). This setting
+    is used by all other Postfix programs. The buffer size is adequate for
+    reading. If the cache is smaller than the table, random read performance is
+    hardly cache size dependent, except with btree tables, where the cache size
+    must be large enough to contain the entire path from the root node.
+    Empirical evidence shows that 64 kBytes may be sufficient. We double the
+    size to play safe, and to anticipate changes in implementation and bloat.
+
+MMiissssiinngg pptthhrreeaadd lliibbrraarryy ttrroouubbllee
+
+When building Postfix fails with:
+
+    undefined reference to `pthread_condattr_setpshared'
+    undefined reference to `pthread_mutexattr_destroy'
+    undefined reference to `pthread_mutexattr_init'
+    undefined reference to `pthread_mutex_trylock'
+
+Add the "-lpthread" library to the "make makefiles" command.
+
+    % make makefiles .... AUXLIBS="... -lpthread"
+
+More information is available at http://www.oracle.com/database/berkeley-db/.
+