133 lines
5.0 KiB
HTML
133 lines
5.0 KiB
HTML
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<title>Flush caches to disk mid-transaction</title>
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<!-- keywords: sqlite3_db_cacheflush -->
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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>Flush caches to disk mid-transaction</h2>
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</div>
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<blockquote><pre>
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int sqlite3_db_cacheflush(sqlite3*);
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</pre></blockquote>
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<p>
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If a write-transaction is open on <a href="../c3ref/sqlite3.html">database connection</a> D when the
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<a href="../c3ref/db_cacheflush.html">sqlite3_db_cacheflush(D)</a> interface invoked, any dirty
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pages in the pager-cache that are not currently in use are written out
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to disk. A dirty page may be in use if a database cursor created by an
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active SQL statement is reading from it, or if it is page 1 of a database
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file (page 1 is always "in use"). The <a href="../c3ref/db_cacheflush.html">sqlite3_db_cacheflush(D)</a>
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interface flushes caches for all schemas - "main", "temp", and
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any <a href="../lang_attach.html">attached</a> databases.</p>
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<p>If this function needs to obtain extra database locks before dirty pages
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can be flushed to disk, it does so. If those locks cannot be obtained
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immediately and there is a busy-handler callback configured, it is invoked
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in the usual manner. If the required lock still cannot be obtained, then
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the database is skipped and an attempt made to flush any dirty pages
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belonging to the next (if any) database. If any databases are skipped
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because locks cannot be obtained, but no other error occurs, this
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function returns SQLITE_BUSY.</p>
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<p>If any other error occurs while flushing dirty pages to disk (for
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example an IO error or out-of-memory condition), then processing is
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abandoned and an SQLite <a href="../rescode.html">error code</a> is returned to the caller immediately.</p>
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<p>Otherwise, if no error occurs, <a href="../c3ref/db_cacheflush.html">sqlite3_db_cacheflush()</a> returns SQLITE_OK.</p>
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<p>This function does not set the database handle error code or message
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returned by the <a href="../c3ref/errcode.html">sqlite3_errcode()</a> and <a href="../c3ref/errcode.html">sqlite3_errmsg()</a> functions.
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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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