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<title>SQLite Release 3.17.0 On 2017-02-13</title>
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<h2>SQLite Release 3.17.0 On 2017-02-13</h2><p><ol class='lessindent'>
<li>Approximately 25% better performance from the <a href="../rtree.html">R-Tree extension</a>.
<ol type='a'>
<li> Uses compiler built-ins (ex: __builtin_bswap32() or _byteswap_ulong())
for byteswapping when available.
<li> Uses the <a href="../c3ref/blob.html">sqlite3_blob</a> key/value access object instead of SQL
for pulling content out of R-Tree nodes
<li> Other miscellaneous enhancements such as loop unrolling.
</ol>
<li>Add the <a href="../compile.html#default_lookaside">SQLITE_DEFAULT_LOOKASIDE</a> compile-time option.
<li>Increase the default <a href="../malloc.html#lookaside">lookaside</a>
size from 512,125 to 1200,100
as this provides better performance while only adding 56KB
of extra memory per connection. Memory-sensitive
applications can restore the old
default at compile-time, start-time, or run-time.
<li>Use compiler built-ins __builtin_sub_overflow(), __builtin_add_overflow(),
and __builtin_mul_overflow() when available. (All compiler
built-ins can be omitted with the <a href="../compile.html#disable_intrinsic">SQLITE_DISABLE_INTRINSIC</a> compile-time
option.)
<li>Added the <a href="../compile.html#enable_null_trim">SQLITE_ENABLE_NULL_TRIM</a> compile-time option, which
can result in significantly smaller database files for some
applications, at the risk of being incompatible with older
versions of SQLite.
<li>Change <a href="../compile.html#default_pcache_initsz">SQLITE_DEFAULT_PCACHE_INITSZ</a> from 100 to 20, for
improved performance.
<li>Added the SQLITE_UINT64_TYPE compile-time option as an
analog to SQLITE_INT64_TYPE.
<li>Perform some <a href="../lang_update.html">UPDATE</a> operations in a single pass instead of
in two passes.
<li>Enhance the <a href="../sessionintro.html">session extension</a> to support <a href="../withoutrowid.html">WITHOUT ROWID</a>
tables.
<li>Fixed performance problems and potential stack overflows
when creating <a href="../lang_createview.html">views</a> from multi-row VALUES clauses with
hundreds of thousands of rows.
<li>Added the <a href="https://www.sqlite.org/src/file/ext/misc/sha1.c">sha1.c</a>
extension.
<li>In the <a href="../cli.html">command-line shell</a>, enhance the ".mode" command so that it
restores the default column and row separators for modes "line",
"list", "column", and "tcl".
<li>Enhance the <a href="../compile.html#direct_overflow_read">SQLITE_DIRECT_OVERFLOW_READ</a> option so that it works
in <a href="../wal.html">WAL mode</a> as long as the pages being read are not in the WAL file.
<li>Enhance the
<a href="../lemon.html">Lemon parser generator</a>
so that it can store the parser object as a stack variable rather than
allocating space from the heap and make use of that enhancement in
the <a href="../amalgamation.html">amalgamation</a>.
<li>Other performance improvements. Uses about <a href="../cpu.html">6.5% fewer CPU cycles</a>.
<p><b>Bug Fixes:</b>
<li>Throw an error if the ON clause of a LEFT JOIN references tables
to the right of the ON clause. This is the same behavior as
PostgreSQL. Formerly, SQLite silently converted the LEFT JOIN
into an INNER JOIN. Fix for ticket
<a href="https://www.sqlite.org/src/info/25e335f802dd">25e335f802dd</a>.
<li>Use the correct affinity for columns of automatic indexes. Ticket
<a href="https://www.sqlite.org/src/info/7ffd1ca1d2ad4ec">7ffd1ca1d2ad4ec</a>.
<li>Ensure that the <a href="../c3ref/blob_reopen.html">sqlite3_blob_reopen()</a> interface can correctly
handle short rows. Fix for ticket
<a href="https://www.sqlite.org/src/info/e6e962d6b0f06f46e">e6e962d6b0f06f46e</a>.
<p><b>Hashes:</b>
<li>SQLITE_SOURCE_ID: "2017-02-13 16:02:40 ada05cfa86ad7f5645450ac7a2a21c9aa6e57d2c"
<li>SHA1 for sqlite3.c: cc7d708bb073c44102a59ed63ce6142da1f174d1
</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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