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<title>SQLite Release 3.6.21 On 2009-12-07</title>
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<h2>SQLite Release 3.6.21 On 2009-12-07</h2><p><ol class='lessindent'>
<li>The SQL output resulting from <a href="../c3ref/profile.html">sqlite3_trace()</a> is now modified to include
the values of <a href="../lang_expr.html#varparam">bound parameters</a>.
<li>Performance optimizations targeting a specific use case from
a single high-profile user of SQLite. A 12% reduction in the number of
CPU operations is achieved (as measured by Valgrind). Actual performance
improvements in practice may vary depending on workload. Changes
include:
<ol type='a'>
<li>The <a href="../lang_corefunc.html#ifnull">ifnull()</a> and <a href="../lang_corefunc.html#coalesce">coalesce()</a> SQL functions are now implemented
using in-line VDBE code rather than calling external functions, so that
unused arguments need never be evaluated.
<li>The <a href="../lang_corefunc.html#substr">substr()</a> SQL function does not bother to measure the length
its entire input string if it is only computing a prefix
<li>Unnecessary OP_IsNull, OP_Affinity, and OP_MustBeInt VDBE opcodes
are suppressed
<li>Various code refactorizations for performance
</ol>
<li>The FTS3 extension has undergone a major rework and cleanup.
New <a href="../fts3.html">FTS3 documentation</a> is now available.
<li>The <a href="../compile.html#secure_delete">SQLITE_SECURE_DELETE</a> compile-time option fixed to make sure that
content is deleted even when the <a href="../lang_delete.html#truncateopt">truncate optimization</a> applies.
<li>Improvements to "dot-command" handling in the
<a href="../cli.html">Command Line Interface</a>.
<li>Other minor bug fixes and documentation enhancements.
</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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