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<h2>SQLite Release 3.8.8.1 On 2015-01-20</h2><p><b>Changes in version 3.8.8 (2015-01-16):</b></p>
<p><ol class='lessindent'>
<p><b>New Features:</b>
<li value='1'>Added the <a href="../pragma.html#pragma_data_version">PRAGMA data_version</a> command that can be used to determine if
a database file has been modified by another process.
<li>Added the <a href="../c3ref/c_checkpoint_full.html">SQLITE_CHECKPOINT_TRUNCATE</a> option to the
<a href="../c3ref/wal_checkpoint_v2.html">sqlite3_wal_checkpoint_v2()</a> interface, with corresponding enhancements
to <a href="../pragma.html#pragma_wal_checkpoint">PRAGMA wal_checkpoint</a>.
<li>Added the <a href="../c3ref/stmt_scanstatus.html">sqlite3_stmt_scanstatus()</a> interface, available only when
compiled with <a href="../compile.html#enable_stmt_scanstatus">SQLITE_ENABLE_STMT_SCANSTATUS</a>.
<li>The <a href="../c3ref/table_column_metadata.html">sqlite3_table_column_metadata()</a> is enhanced to work correctly on
<a href="../withoutrowid.html">WITHOUT ROWID</a> tables and to check for the existence of a
a table if the column name parameter is NULL. The interface is now
also included in the build by default, without requiring
the <a href="../compile.html#enable_column_metadata">SQLITE_ENABLE_COLUMN_METADATA</a> compile-time option.
<li>Added the <a href="../compile.html#enable_api_armor">SQLITE_ENABLE_API_ARMOR</a> compile-time option.
<li>Added the <a href="../compile.html#reverse_unordered_selects">SQLITE_REVERSE_UNORDERED_SELECTS</a> compile-time option.
<li>Added the <a href="../compile.html#sorter_pmasz">SQLITE_SORTER_PMASZ</a> compile-time option and <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigpmasz">SQLITE_CONFIG_PMASZ</a>
start-time option.
<li>Added the <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigpcachehdrsz">SQLITE_CONFIG_PCACHE_HDRSZ</a> option to <a href="../c3ref/config.html">sqlite3_config()</a>
which makes it easier for applications to determine the appropriate
amount of memory for use with <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigpagecache">SQLITE_CONFIG_PAGECACHE</a>.
<li>The number of rows in a <a href="../lang_select.html#values">VALUES clause</a> is no longer limited by
<a href="../c3ref/c_limit_attached.html#sqlitelimitcompoundselect">SQLITE_LIMIT_COMPOUND_SELECT</a>.
<li>Added the <a href="https://www.sqlite.org/src/artifact/f971962e92ebb8b0">eval.c</a>
<a href="../loadext.html">loadable extension</a> that implements an eval() SQL function that will recursively
evaluate SQL.
<p><b>Performance Enhancements:</b>
<li>Reduce the number of memcpy() operations involved in balancing a b-tree,
for 3.2% overall performance boost.
<li>Improvements to cost estimates for the <a href="../optoverview.html#skipscan">skip-scan optimization</a>.
<li>The <a href="../optoverview.html#autoindex">automatic indexing</a> optimization is now capable of generating
a <a href="../partialindex.html">partial index</a> if that is appropriate.
<p><b>Bug fixes:</b>
<li>Ensure durability following a power loss with
"PRAGMA journal_mode=TRUNCATE" by calling fsync() right after truncating
the journal file.
<li>The query planner now recognizes that any column in the right-hand
table of a LEFT JOIN can be NULL, even if that column has a NOT NULL
constraint. Avoid trying to optimize out NULL tests in those cases.
Fix for ticket
<a href="https://www.sqlite.org/src/info/6f2222d550f5b0ee7ed">6f2222d550f5b0ee7ed</a>.
<li>Make sure ORDER BY puts rows in ascending order even if the DISTINCT
operator is implemented using a descending index. Fix for ticket
<a href="https://www.sqlite.org/src/info/c5ea805691bfc4204b1cb9e">c5ea805691bfc4204b1cb9e</a>.
<li>Fix data races that might occur under stress when running with many threads
in <a href="../sharedcache.html">shared cache mode</a> where some of the threads are opening and
closing connections.
<li>Fix obscure crash bugs found by
<a href="http://lcamtuf.coredump.cx/afl/">american fuzzy lop</a>. Ticket
<a href="https://www.sqlite.org/src/info/a59ae93ee990a55">a59ae93ee990a55</a>.
<li>Work around a GCC optimizer bug (for gcc 4.2.1 on MacOS 10.7) that caused the
<a href="../rtree.html">R-Tree extension</a> to compute incorrect results when compiled with -O3.
<p><b>Other changes:</b>
<li>Disable the use of the strchrnul() C-library routine unless it is
specifically enabled using the -DHAVE_STRCHRNULL compile-time option.
<li>Improvements to the effectiveness and accuracy of the
<a href="../lang_corefunc.html#likelihood">likelihood()</a>, <a href="../lang_corefunc.html#likely">likely()</a>, and <a href="../lang_corefunc.html#unlikely">unlikely()</a> SQL hint functions.
</ol>
<p><b>Additional changes in version 3.8.8.1 (2015-01-20):</b></p>
<p><ol class='lessindent'>
<li value='22'>Fix a bug in the sorting logic, present since version 3.8.4, that can cause
output to appear in the wrong order on queries that contains an ORDER BY clause,
a LIMIT clause, and that have approximately 60 or more columns in the result set.
Ticket <a href="https://www.sqlite.org/src/tktview?name=f97c4637102a3ae72b79">f97c4637102a3ae72b79</a>.
<li>SQLITE_SOURCE_ID: "2015-01-20 16:51:25 f73337e3e289915a76ca96e7a05a1a8d4e890d55"
<li>SHA1 for sqlite3.c: 33987fb50dcc09f1429a653d6b47672f5a96f19e
</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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