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<title>SQLite Release 3.8.1 On 2013-10-17</title>
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<h2>SQLite Release 3.8.1 On 2013-10-17</h2><p><ol class='lessindent'>
<li>Added the <a href="../lang_corefunc.html#unlikely">unlikely()</a> and <a href="../lang_corefunc.html#likelihood">likelihood()</a> SQL functions to be used
as hints to the query planner.
<li>Enhancements to the query planner:
<ol type='a'>
<li>Take into account the fact WHERE clause terms that cannot be used with indices
still probably reduce the number of output rows.
<li>Estimate the sizes of table and index rows and use the smallest applicable B-Tree
for full scans and "count(*)" operations.
</ol>
<li>Added the <a href="../pragma.html#pragma_soft_heap_limit">soft_heap_limit pragma</a>.
<li>Added support for <a href="../compile.html#enable_stat4">SQLITE_ENABLE_STAT4</a>
<li>Added support for "sz=NNN" parameters at the end of
<a href="../fileformat2.html#stat1tab">sqlite_stat1.stat</a> fields
used to specify the average length in bytes for table and index rows.
<li>Avoid running foreign-key constraint checks on an UPDATE if none of the
modified columns are associated with foreign keys.
<li>Added the <a href="../compile.html#minimum_file_descriptor">SQLITE_MINIMUM_FILE_DESCRIPTOR</a> compile-time option
<li>Added the win32-longpath VFS on windows, permitting filenames up to 32K
characters in length.
<li>The <a href="../lang_datefunc.html">Date And Time Functions</a> are enhanced so that the current time
(ex: julianday('now')) is always the same for multiple function invocations
within the same <a href="../c3ref/step.html">sqlite3_step()</a> call.
<li>Add the "totype.c" extension, implementing the tointeger() and toreal()
SQL functions.
<li><a href="../fts3.html#fts4">FTS4</a> queries are better able to make use of docid<$limit constraints to
limit the amount of I/O required.
<li>Added the hidden <a href="../fts3.html#f4alid">fts4aux languageid column</a> to the <a href="../fts3.html#fts4aux">fts4aux</a> virtual table.
<li>The <a href="../lang_vacuum.html">VACUUM</a> command packs the database about 1% tighter.
<li>The sqlite3_analyzer utility program is updated to provide better descriptions
and to compute a more accurate estimate for "Non-sequential pages"
<li>Refactor the implementation of PRAGMA statements to improve parsing performance.
<li>The directory used to hold temporary files on unix can now be set using
the SQLITE_TMPDIR environment variable, which takes precedence over the
TMPDIR environment variable. The <a href="../c3ref/temp_directory.html">sqlite3_temp_directory</a> global variable
still has higher precedence than both environment variables, however.
<li>Added the <a href="../pragma.html#pragma_stats">PRAGMA stats</a> statement.
<li><b>Bug fix:</b> Return the correct answer for "SELECT count(*) FROM table" even if
there is a <a href="../partialindex.html">partial index</a> on the table. Ticket
<a href="https://www.sqlite.org/src/info/a5c8ed66ca">a5c8ed66ca</a>.
<li>SQLITE_SOURCE_ID:
"2013-10-17 12:57:35 c78be6d786c19073b3a6730dfe3fb1be54f5657a"
<li>SHA1 for sqlite3.c: 0a54d76566728c2ba96292a49b138e4f69a7c391
</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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