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<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
<h2>Flush caches to disk mid-transaction</h2>
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<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="../c3ref/objlist.html">Objects</a>,
<a href="../c3ref/constlist.html">Constants</a>, and
<a href="../c3ref/funclist.html">Functions</a>.</p>
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