131 lines
4.8 KiB
HTML
131 lines
4.8 KiB
HTML
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<title>Configure an auto-checkpoint</title>
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<!-- keywords: sqlite3_wal_autocheckpoint -->
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<div class=nosearch>
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Configure an auto-checkpoint</h2>
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</div>
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<blockquote><pre>
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int sqlite3_wal_autocheckpoint(sqlite3 *db, int N);
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</pre></blockquote>
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<p>
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The <a href="../c3ref/wal_autocheckpoint.html">sqlite3_wal_autocheckpoint(D,N)</a> is a wrapper around
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<a href="../c3ref/wal_hook.html">sqlite3_wal_hook()</a> that causes any database on <a href="../c3ref/sqlite3.html">database connection</a> D
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to automatically <a href="../wal.html#ckpt">checkpoint</a>
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after committing a transaction if there are N or
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more frames in the <a href="../wal.html">write-ahead log</a> file. Passing zero or
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a negative value as the nFrame parameter disables automatic
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checkpoints entirely.</p>
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<p>The callback registered by this function replaces any existing callback
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registered using <a href="../c3ref/wal_hook.html">sqlite3_wal_hook()</a>. Likewise, registering a callback
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using <a href="../c3ref/wal_hook.html">sqlite3_wal_hook()</a> disables the automatic checkpoint mechanism
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configured by this function.</p>
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<p>The <a href="../pragma.html#pragma_wal_autocheckpoint">wal_autocheckpoint pragma</a> can be used to invoke this interface
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from SQL.</p>
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<p>Checkpoints initiated by this mechanism are
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<a href="../c3ref/wal_checkpoint_v2.html">PASSIVE</a>.</p>
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<p>Every new <a href="../c3ref/sqlite3.html">database connection</a> defaults to having the auto-checkpoint
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enabled with a threshold of 1000 or <a href="../compile.html#default_wal_autocheckpoint">SQLITE_DEFAULT_WAL_AUTOCHECKPOINT</a>
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pages. The use of this interface
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is only necessary if the default setting is found to be suboptimal
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for a particular application.
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</p><p>See also lists of
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<a href="objlist.html">Objects</a>,
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<a href="constlist.html">Constants</a>, and
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<a href="funclist.html">Functions</a>.</p>
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