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<title>SQLite Release 3.7.10 On 2012-01-16</title>
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<h2>SQLite Release 3.7.10 On 2012-01-16</h2><p><ol class='lessindent'>
<li>The default <a href="../fileformat2.html#schemaformat">schema format number</a> is changed from 1 to 4.
This means that, unless
the <a href="../pragma.html#pragma_legacy_file_format">PRAGMA legacy_file_format=ON</a> statement is
run, newly created database files will be unreadable by version of SQLite
prior to 3.3.0 (2006-01-10). It also means that the <a href="../lang_createindex.html#descidx">descending indices</a>
are enabled by default.
<li>The sqlite3_pcache_methods structure and the <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigpcache">SQLITE_CONFIG_PCACHE</a>
and <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfiggetpcache">SQLITE_CONFIG_GETPCACHE</a> configuration parameters are deprecated.
They are replaced by a new <a href="../c3ref/pcache_methods2.html">sqlite3_pcache_methods2</a> structure and
<a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigpcache2">SQLITE_CONFIG_PCACHE2</a> and <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfiggetpcache2">SQLITE_CONFIG_GETPCACHE2</a> configuration
parameters.
<li>Added the <a href="../psow.html">powersafe overwrite</a> property to the VFS interface. Provide
the <a href="../c3ref/c_iocap_atomic.html">SQLITE_IOCAP_POWERSAFE_OVERWRITE</a> I/O capability, the
<a href="../compile.html#powersafe_overwrite">SQLITE_POWERSAFE_OVERWRITE</a> compile-time option, and the
"psow=BOOLEAN" query parameter for <a href="../uri.html">URI filenames</a>.
<li>Added the <a href="../c3ref/db_release_memory.html">sqlite3_db_release_memory()</a> interface and the
<a href="../pragma.html#pragma_shrink_memory">shrink_memory pragma</a>.
<li>Added the <a href="../c3ref/db_filename.html">sqlite3_db_filename()</a> interface.
<li>Added the <a href="../c3ref/stmt_busy.html">sqlite3_stmt_busy()</a> interface.
<li>Added the <a href="../c3ref/uri_boolean.html">sqlite3_uri_boolean()</a> and <a href="../c3ref/uri_boolean.html">sqlite3_uri_int64()</a> interfaces.
<li>If the argument to <a href="../pragma.html#pragma_cache_size">PRAGMA cache_size</a> is negative N, that means to use
approximately -1024*N bytes of memory for the page cache regardless of
the page size.
<li>Enhanced the default memory allocator to make use of _msize() on windows,
malloc_size() on Mac, and malloc_usable_size() on Linux.
<li>Enhanced the query planner to support index queries with range constraints
on the rowid.
<li>Enhanced the query planner flattening logic to allow UNION ALL compounds
to be promoted upwards to replace a simple wrapper SELECT even if the
compounds are joins.
<li>Enhanced the query planner so that the xfer optimization can be used with
INTEGER PRIMARY KEY ON CONFLICT as long as the destination table is
initially empty.
<li>Enhanced the windows <a href="../vfs.html">VFS</a> so that all system calls can be overridden
using the xSetSystemCall interface.
<li>Updated the "unix-dotfile" <a href="../vfs.html">VFS</a> to use locking directories with mkdir()
and rmdir() instead of locking files with open() and unlink().
<li>Enhancements to the test_quota.c extension to support stdio-like interfaces
with quotas.
<li>Change the unix <a href="../vfs.html">VFS</a> to be tolerant of read() system calls that return
less then the full number of requested bytes.
<li>Change both unix and windows <a href="../vfs.html">VFSes</a> to report a sector size of 4096
instead of the old default of 512.
<li>In the <a href="../tclsqlite.html">TCL Interface</a>, add the -uri option to the "sqlite3" TCL command
used for creating new database connection objects.
<li>Added the <a href="../c3ref/c_testctrl_always.html">SQLITE_TESTCTRL_EXPLAIN_STMT</a> test-control option with the
<a href="../compile.html#enable_tree_explain">SQLITE_ENABLE_TREE_EXPLAIN</a> compile-time option to enable the
<a href="../cli.html">command-line shell</a> to display ASCII-art parse trees of SQL statements
that it processes, for debugging and analysis.
<li><b>Bug fix:</b>
Add an additional xSync when restarting a WAL in order to prevent an
exceedingly unlikely but theoretically possible
database corruption following power-loss.
Ticket <a href="http://www.sqlite.org/src/info/ff5be73dee">ff5be73dee</a>.
<li><b>Bug fix:</b>
Change the VDBE so that all registers are initialized to Invalid
instead of NULL.
Ticket <a href="http://www.sqlite.org/src/info/7bbfb7d442">7bbfb7d442</a>
<li><b>Bug fix:</b>
Fix problems that can result from 32-bit integer overflow.
Ticket <a href="http://www.sqlite.org/src/info/ac0ff496b7e2">ac00f496b7e2</a>
<li>SQLITE_SOURCE_ID:
"2012-01-16 13:28:40 ebd01a8deffb5024a5d7494eef800d2366d97204"
<li>SHA1 for sqlite3.c: 6497cbbaad47220bd41e2e4216c54706e7ae95d4
</ol></p>
<p>A <a href="../changes.html">complete list of SQLite releases</a>
in a single page and a <a href="../chronology.html">chronology</a> are both also available.
A detailed history of every
check-in is available at
<a href="http://www.sqlite.org/src/timeline">
SQLite version control site</a>.</p>
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