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<title>SQLite Release 3.40.0 On 2022-11-16</title>
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<h2>SQLite Release 3.40.0 On 2022-11-16</h2><p><ol class='lessindent'>
<li> Add support for compiling <a href="https://sqlite.org/wasm">SQLite to WASM</a>
and running it in web browsers. NB: The WASM build and its interfaces
are considered "beta" and are subject to minor changes if the need
arises. We anticipate finalizing the interface for the next release.
<li> Add the <a href="../recovery.html">recovery extension</a> that might be able to recover some content
from a corrupt database file.
<li> Query planner enhancements:
<ol type="a">
<li> Recognize <a href="../queryplanner.html#covidx">covering indexes</a> on tables with more than 63 columns where
columns beyond the 63rd column are used in the query and/or are
referenced by the index.
<li> Extract the values of expressions contained within <a href="../expridx.html">expression indexes</a>
where practical, rather than recomputing the expression.
<li> The NOT NULL and IS NULL operators (and their equivalents) avoid
loading the content of large strings and BLOB values from disk.
<li> Avoid materializing a view on which a full scan is performed
exactly once. Use and discard the rows of the view as they are computed.
<li> Allow flattening of a subquery that is the right-hand operand of
a LEFT JOIN in an aggregate query.
</ol>
<li> A new typedef named <a href="../c3ref/filename.html">sqlite3_filename</a> is added and used to represent
the name of a database file. Various interfaces are
modified to use the new typedef instead of "char*". This interface
change should be fully backwards compatible, though it might cause
(harmless) compiler warnings when rebuilding some legacy applications.
<li> Add the <a href="../c3ref/value_blob.html">sqlite3_value_encoding()</a> interface.
<li> Security enhancement: <a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigdefensive">SQLITE_DBCONFIG_DEFENSIVE</a> is augmented to prohibit
changing the <a href="../pragma.html#pragma_schema_version">schema_version</a>. The schema_version
becomes read-only in defensive mode.
<li> Enhancements to the <a href="../pragma.html#pragma_integrity_check">PRAGMA integrity_check</a> statement:
<ol type="a">
<li> Columns in non-STRICT tables with TEXT affinity should not contain numeric values.
<li> Columns in non-STRICT tables with NUMERIC affinity should not
contain TEXT values that could be converted into numbers.
<li> Verify that the rows of a <a href="../withoutrowid.html">WITHOUT ROWID</a> table are in the correct order.
</ol>
<li> Enhance the <a href="../lang_vacuum.html#vacuuminto">VACUUM INTO</a> statement so that it honors the
<a href="../pragma.html#pragma_synchronous">PRAGMA synchronous</a> setting.
<li> Enhance the <a href="../c3ref/strglob.html">sqlite3_strglob()</a> and <a href="../c3ref/strlike.html">sqlite3_strlike()</a> APIs so that they are able
to accept NULL pointers for their string parameters and still generate a sensible
result.
<li> Provide the new <a href="../compile.html#max_allocation_size">SQLITE_MAX_ALLOCATION_SIZE</a> compile-time option for limiting
the size of memory allocations.
<li> Change the algorithm used by SQLite's built-in pseudo-random number generator (PRNG)
from RC4 to Chacha20.
<li> Allow two or more indexes to have the same name as long as they are all in
separate schemas.
<li> Miscellaneous performance optimizations result in about 1% fewer CPU cycles
used on typical workloads.
<p><b>Hashes:</b>
<li>SQLITE_SOURCE_ID: 2022-11-16 12:10:08 89c459e766ea7e9165d0beeb124708b955a4950d0f4792f457465d71b158d318
<li>SHA3-256 for sqlite3.c: ab8da6bc754642989e67d581f26683dc705b068cea671970f0a7d32cfacbad19
</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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