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<h3>DB_ENV->txn_checkpoint</h3>
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<h3><pre>
#include <db.h>
<p>
int
DB_ENV->txn_checkpoint(const DB_ENV *env,
u_int32_t kbyte, u_int32_t min, u_int32_t flags);
</pre></h3>
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<h3>Description: DB_ENV->txn_checkpoint</h3>
<p>The DB_ENV->txn_checkpoint method flushes the underlying memory pool, writes
a checkpoint record to the log, and then flushes the log.</p>
<p>The DB_ENV->txn_checkpoint method
returns a non-zero error value on failure
and 0 on success.
</p>
<p>The DB_ENV->txn_checkpoint method is the underlying method used by the <a href="../../db42-4.2.52/utility/db_checkpoint.html">db_checkpoint</a> utility.
See the <a href="../../db42-4.2.52/utility/db_checkpoint.html">db_checkpoint</a> utility source code for an example of using DB_ENV->txn_checkpoint
in a IEEE/ANSI Std 1003.1 (POSIX) environment.</p>
<h3>Parameters</h3>
<p><dl compact>
<p><dt><b>flags</b><dd>
The <b>flags</b> parameter must be set to 0 or
the following value:
<p><dl compact>
<p><dt><a name="DB_FORCE">DB_FORCE</a><dd>Force a checkpoint record, even if there has been no activity since the
last checkpoint.
</dl>
<p><dt><b>kbyte</b><dd>
If the <b>kbyte</b> parameter is non-zero, a checkpoint will be done
if more than <b>kbyte</b> kilobytes of log data have been written since
the last checkpoint.
<p><dt><b>min</b><dd>
If the <b>min</b> parameter is non-zero, a checkpoint will be done if
more than <b>min</b> minutes have passed since the last checkpoint.
</dl>
<h3>Errors</h3>
<p>The DB_ENV->txn_checkpoint method
may fail and return one of the following non-zero errors:</p>
<p><dl compact>
<p><dt>EINVAL<dd>An
invalid flag value or parameter was specified.
</dl>
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<h3>Class</h3>
<a href="../../db42-devel-4.2.52/api_c/env_class.html">DB_ENV</a>, <a href="../../db42-devel-4.2.52/api_c/txn_class.html">DB_TXN</a>
<h3>See Also</h3>
<a href="../../db42-devel-4.2.52/api_c/txn_list.html">Transaction Subsystem and Related Methods</a>
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