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<h2>SQLite Release 3.8.7 On 2014-10-17</h2><p><ol class='lessindent'>
<p><b>Performance Enhancements:</b>
<li>Many micro-optimizations result in 20.3% more work for the same number
of CPU cycles relative to the previous release.
The cumulative performance increase since <a href="../releaselog/3_8_0.html">version 3.8.0</a> is 61%.
(Measured using
<a href="http://valgrind.org/docs/manual/cg-manual.html">cachegrind</a> on the
<a href="https://www.sqlite.org/src/artifact/83f6b3318f7ee">speedtest1.c</a> workload on
Ubuntu 13.10 x64 with gcc 4.8.1 and -Os. Your performance may vary.)
<li>The sorter can use auxiliary helper threads to increase real-time response.
This feature is off by default and may be
enabled using the <a href="../pragma.html#pragma_threads">PRAGMA threads</a> command or the <a href="../compile.html#default_worker_threads">SQLITE_DEFAULT_WORKER_THREADS</a>
compile-time option.
<li>Enhance the <a href="../optoverview.html#skipscan">skip-scan</a> optimization so that it is able to skip index terms that
occur in the middle of the index, not just as the left-hand side of the index.
<li>Improved optimization of <a href="../lang_expr.html#castexpr">CAST</a> operators.
<li>Various improvements in how the query planner uses <a href="../fileformat2.html#stat4tab">sqlite_stat4</a>
information to estimate plan costs.
<p><b>New Features:</b>
<li>Added new interfaces with 64-bit length parameters:
<a href="../c3ref/free.html">sqlite3_malloc64()</a>,
<a href="../c3ref/free.html">sqlite3_realloc64()</a>,
<a href="../c3ref/bind_blob.html">sqlite3_bind_blob64()</a>,
<a href="../c3ref/result_blob.html">sqlite3_result_blob64()</a>,
<a href="../c3ref/bind_blob.html">sqlite3_bind_text64()</a>, and
<a href="../c3ref/result_blob.html">sqlite3_result_text64()</a>.
<li>Added the new interface <a href="../c3ref/free.html">sqlite3_msize()</a> that returns the size of a memory allocation
obtained from <a href="../c3ref/free.html">sqlite3_malloc64()</a> and its variants.
<li>Added the <a href="../c3ref/c_limit_attached.html#sqlitelimitworkerthreads">SQLITE_LIMIT_WORKER_THREADS</a> option to <a href="../c3ref/limit.html">sqlite3_limit()</a> and
<a href="../pragma.html#pragma_threads">PRAGMA threads</a> command for configuring the number of available worker threads.
<li>The <a href="../spellfix1.html">spellfix1</a> extension allows the application to optionally specify the rowid for
each INSERT.
<li>Added the <a href="https://www.sqlite.org/src/doc/trunk/ext/userauth/user-auth.txt">User Authentication</a>
extension.
<p><b>Bug Fixes:</b>
<li>Fix a bug in the <a href="../partialindex.html">partial index</a> implementation that might result in an incorrect
answer if a partial index is used in a subquery or in a <a href="../lang_createview.html">view</a>.
Ticket <a href="https://www.sqlite.org/src/info/98d973b8f5">98d973b8f5</a>.
<li>Fix a query planner bug that might cause a table to be scanned in the wrong direction
(thus reversing the order of output) when a DESC index is used to implement the ORDER BY
clause on a query that has an identical GROUP BY clause.
Ticket <a href="https://www.sqlite.org/src/info/ba7cbfaedc7e6">ba7cbfaedc7e6</a>.
<li>Fix a bug in <a href="../c3ref/profile.html">sqlite3_trace()</a> that was causing it to sometimes fail to print
an SQL statement if that statement needed to be re-prepared.
Ticket <a href="https://www.sqlite.org/src/info/11d5aa455e0d98f3c1e6a08">11d5aa455e0d98f3c1e6a08</a>
<li>Fix a faulty assert() statement.
Ticket <a href="https://www.sqlite.org/src/info/369d57fb8e5ccdff06f1">369d57fb8e5ccdff06f1</a>
<p><b>Test, Debug, and Analysis Changes:</b>
<li>Show ASCII-art abstract syntax tree diagrams using the ".selecttrace"
and ".wheretrace" commands in the
<a href="../cli.html">command-line shell</a> when compiled with <a href="../compile.html#debug">SQLITE_DEBUG</a>, SQLITE_ENABLE_SELECTTRACE,
and SQLITE_ENABLE_WHERETRACE. Also provide the sqlite3TreeViewExpr() and
sqlite3TreeViewSelect() entry points that can be invoked from with the
debugger to show the parse tree when stopped at a breakpoint.
<li>Drop support for SQLITE_ENABLE_TREE_EXPLAIN. The SELECTTRACE mechanism provides
more useful diagnostics information.
<li>New options to the <a href="../cli.html">command-line shell</a> for configuring auxiliary
memory usage: --pagecache, --lookaside, and --scratch.
<li>SQLITE_SOURCE_ID: "2014-10-17 11:24:17 e4ab094f8afce0817f4074e823fabe59fc29ebb4"
<li>SHA1 for sqlite3.c: 56dcf5e931a9e1fa12fc2d600cd91d3bf9b639cd
</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="https://www.sqlite.org/src/timeline">
SQLite version control site</a>.</p>
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