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<!--$Id: txn_checkpoint.so,v 10.25 2000/09/08 15:20:28 bostic Exp $-->
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<h1>DbEnv::txn_checkpoint</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
int
DbEnv::txn_checkpoint(u_int32_t kbyte, u_int32_t min, u_int32_t flags) const;
</pre></h3>
<h1>Description</h1>
<p>The DbEnv::txn_checkpoint method flushes the underlying memory pool,
writes a checkpoint record to the log and then flushes the log.
<p>If either <b>kbyte</b> or <b>min</b> is non-zero, the checkpoint is only
done if there has been activity since the last checkpoint and either
more than <b>min</b> minutes have passed since the last checkpoint,
or if more than <b>kbyte</b> kilobytes of log data have been written since
the last checkpoint.
<p>The <b>flags</b> parameter must be set to 0 or one of the following
values:
<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>The DbEnv::txn_checkpoint method either returns a non-zero error value or throws an exception that
encapsulates a non-zero error value on failure, 0 on success, and returns <a href="../api_c/memp_fsync.html#DB_INCOMPLETE">DB_INCOMPLETE</a> if there were pages that needed to be
written to complete the checkpoint but that <a href="../api_cxx/memp_sync.html">DbEnv::memp_sync</a> was unable
to write immediately.
<h1>Errors</h1>
<p>The DbEnv::txn_checkpoint method may fail and throw an exception or return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
</dl>
<p>The DbEnv::txn_checkpoint method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbEnv::txn_checkpoint method may fail and either
return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw an exception encapsulating
<a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>, in which case all subsequent Berkeley DB calls will fail
in the same way.
<h3>Classes</h3>
<a href="../api_cxx/dbenv_class.html">DbEnv</a>, <a href="../api_cxx/txn_class.html">DbTxn</a>
<h1>See Also</h1>
<a href="../api_cxx/env_set_tx_max.html">DbEnv::set_tx_max</a>,
<a href="../api_cxx/env_set_tx_recover.html">DbEnv::set_tx_recover</a>,
<a href="../api_cxx/env_set_tx_timestamp.html">DbEnv::set_tx_timestamp</a>,
<a href="../api_cxx/txn_abort.html">DbTxn::abort</a>,
<a href="../api_cxx/txn_begin.html">DbEnv::txn_begin</a>,
<a href="../api_cxx/txn_checkpoint.html">DbEnv::txn_checkpoint</a>,
<a href="../api_cxx/txn_commit.html">DbTxn::commit</a>,
<a href="../api_cxx/txn_id.html">DbTxn::id</a>,
<a href="../api_cxx/txn_prepare.html">DbTxn::prepare</a>
and
<a href="../api_cxx/txn_stat.html">DbEnv::txn_stat</a>.
</tt>
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