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