175 lines
8.7 KiB
HTML
175 lines
8.7 KiB
HTML
<!DOCTYPE html>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link href="../sqlite.css" rel="stylesheet">
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<title>SQLite Release 3.12.1 On 2016-04-08</title>
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</head>
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<body>
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<div class=nosearch>
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<a href="../index.html">
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Small. Fast. Reliable.<br>Choose any three.
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<li><a href="../index.html">Home</a>
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<option value="d">Search Documentation</option>
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<option value="c">Search Changelog</option>
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<h2>SQLite Release 3.12.1 On 2016-04-08</h2><p><b>Changes in version 3.12.0 (2016-03-29):</b></p>
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<p><ol class='lessindent'>
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<p><b>Potentially Disruptive Change:</b>
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<li value='1'>The <a href="../compile.html#default_page_size">SQLITE_DEFAULT_PAGE_SIZE</a> is increased from 1024 to 4096.
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The <a href="../compile.html#default_cache_size">SQLITE_DEFAULT_CACHE_SIZE</a> is changed from 2000 to -2000 so
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the same amount of cache memory is used by default.
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See the application note on the
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<a href="../pgszchng2016.html">version 3.12.0 page size change</a> for further information.
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<p><b>Performance enhancements:</b>
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<li>Enhancements to the <a href="../lemon.html">Lemon parser generator</a>
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so that it creates a smaller and faster SQL parser.
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<li>Only create <font color="red">master journal</font> files if two or more attached databases are all
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modified, do not have <a href="../pragma.html#pragma_synchronous">PRAGMA synchronous</a> set to OFF, and
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do not have the <a href="../pragma.html#pragma_journal_mode">journal_mode</a> set to OFF, MEMORY, or WAL.
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<li>Only create <a href="../tempfiles.html#stmtjrnl">statement journal</a> files when their size exceeds a threshold.
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Otherwise the journal is held in memory and no I/O occurs. The threshold
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can be configured at compile-time using <a href="../compile.html#stmtjrnl_spill">SQLITE_STMTJRNL_SPILL</a> or at
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start-time using <a href="../c3ref/config.html">sqlite3_config</a>(<a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigstmtjrnlspill">SQLITE_CONFIG_STMTJRNL_SPILL</a>).
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<li>The query planner is able to optimize IN operators on <a href="../vtab.html">virtual tables</a>
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even if the <a href="../vtab.html#xbestindex">xBestIndex</a> method does not set the
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sqlite3_index_constraint_usage.omit flag of the
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virtual table column to the left of the IN operator.
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<li>The query planner now does a better job of optimizing <a href="../vtab.html">virtual table</a>
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accesses in a 3-way or higher join where constraints on the virtual
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table are split across two or more other tables of the join.
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<li>More efficient handling of <a href="../appfunc.html">application-defined SQL functions</a>, especially
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in cases where the application defines hundreds or thousands of
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custom functions.
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<li>The query planner considers the LIMIT clause when estimating the cost
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of ORDER BY.
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<li>The configure script (on unix) automatically detects
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pread() and pwrite() and sets compile-time options to use those OS
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interfaces if they are available.
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<li>Reduce the amount of memory needed to hold the schema.
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<li>Other miscellaneous micro-optimizations for improved performance and reduced
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memory usage.
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<p><b>New Features:</b>
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<li>Added the <a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigenablefts3tokenizer">SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER</a> option to <a href="../c3ref/db_config.html">sqlite3_db_config()</a>
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which allows the two-argument version of the <a href="../fts3.html#f3tknzr">fts3_tokenizer()</a> SQL function to
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be enabled or disabled at run-time.
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<li>Added the <a href="https://www.sqlite.org/src/artifact/d7cc99350?ln=403-443">sqlite3rbu_bp_progress()</a>
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interface to the <a href="../rbu.html">RBU</a> extension.
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<li>The <a href="../pragma.html#pragma_defer_foreign_keys">PRAGMA defer_foreign_keys=ON</a> statement now also disables
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<a href="../foreignkeys.html#fk_actions">RESTRICT actions</a> on foreign key.
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<li>Added the <a href="../c3ref/system_errno.html">sqlite3_system_errno()</a> interface.
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<li>Added the <a href="../compile.html#default_synchronous">SQLITE_DEFAULT_SYNCHRONOUS</a> and <a href="../compile.html#default_wal_synchronous">SQLITE_DEFAULT_WAL_SYNCHRONOUS</a>
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compile-time options. The <a href="../compile.html#default_synchronous">SQLITE_DEFAULT_SYNCHRONOUS</a> compile-time option
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replaces the <a href="../compile.html#extra_durable">SQLITE_EXTRA_DURABLE</a> option, which is no longer supported.
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<li>Enhanced the ".stats" command in the <a href="../cli.html">command-line shell</a> to show more
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information about I/O performance obtained from /proc, when available.
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<p><b>Bug fixes:</b>
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<li>Make sure the <a href="../c3ref/get_auxdata.html">sqlite3_set_auxdata()</a> values from multiple triggers
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within a single statement do not interfere with one another.
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Ticket <a href="https://www.sqlite.org/src/info/dc9b1c91">dc9b1c91</a>.
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<li>Fix the code generator for expressions of the form "x IN (SELECT...)" where
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the SELECT statement on the RHS is a correlated subquery.
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Ticket <a href="https://www.sqlite.org/src/info/5e3c886796e5512e">5e3c886796e5512e</a>.
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<li>Fix a harmless TSAN warning associated with the <a href="../c3ref/db_readonly.html">sqlite3_db_readonly()</a> interface.
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</ol>
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<p><b>Additional changes in version 3.12.1:</b></p>
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<p><ol class='lessindent'>
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<li value='21'>Fix a boundary condition error introduced by version 3.12.0
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that can result in a crash during heavy <a href="../lang_savepoint.html">SAVEPOINT</a> usage.
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Ticket <a href="https://www.sqlite.org/src/info/7f7f8026eda38">7f7f8026eda38</a>.
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<li>Fix <a href="../lang_createview.html">views</a> so that they inherit column datatypes from the
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table that they are defined against, when possible.
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<li>Fix the query planner so that IS and IS NULL operators are able
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to drive an index on a LEFT OUTER JOIN.
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<p><b>Hashes:</b>
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<li>SQLITE_SOURCE_ID: "2016-04-08 15:09:49 fe7d3b75fe1bde41511b323925af8ae1b910bc4d"
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<li>SHA1 for sqlite3.c: ebb18593350779850e3e1a930eb84a70fca8c1d1
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</ol></p>
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<p>A <a href="../changes.html">complete list of SQLite releases</a>
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in a single page and a <a href="../chronology.html">chronology</a> are both also available.
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A detailed history of every
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check-in is available at
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<a href="http://www.sqlite.org/src/timeline">
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SQLite version control site</a>.</p>
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