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<title>Berkeley DB: DbEnv::txn_checkpoint</title>
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<h1>DbEnv::txn_checkpoint</h1>
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<a href="../api_cxx/cxx_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../images/ref.gif" alt="Ref"></a>
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#include <db_cxx.h>
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DbEnv::txn_checkpoint(u_int32_t kbyte, u_int32_t min, u_int32_t flags) const;
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<p>The DbEnv::txn_checkpoint method flushes the underlying memory pool,
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writes a checkpoint record to the log, and then flushes the log.
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<p>If either <b>kbyte</b> or <b>min</b> is non-zero, the checkpoint is
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done only if there has been activity since the last checkpoint, and
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either more than <b>min</b> minutes have passed since the last
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checkpoint or if more than <b>kbyte</b> kilobytes of log data have been
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written since the last checkpoint.
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<p>The <b>flags</b> value must be set to 0 or
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<p><dt><a name="DB_FORCE">DB_FORCE</a><dd>Force a checkpoint record, even if there has been no activity since the
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<p>The DbEnv::txn_checkpoint method either returns a non-zero error value or throws an exception that
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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
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written to complete the checkpoint but that <a href="../api_cxx/memp_sync.html">DbEnv::memp_sync</a> was unable
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<p>The DbEnv::txn_checkpoint method may fail and throw an exception or return a non-zero error for the following conditions:
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<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
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<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.
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If a catastrophic error has occurred, the DbEnv::txn_checkpoint method may fail and either
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return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw an exception encapsulating
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<a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>, in which case all subsequent Berkeley DB calls will fail
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<a href="../api_cxx/dbenv_class.html">DbEnv</a>, <a href="../api_cxx/txn_class.html">DbTxn</a>
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<a href="../api_cxx/env_set_tx_max.html">DbEnv::set_tx_max</a>,
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<a href="../api_cxx/env_set_tx_recover.html">DbEnv::set_tx_recover</a>,
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<a href="../api_cxx/env_set_tx_timestamp.html">DbEnv::set_tx_timestamp</a>,
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<a href="../api_cxx/txn_abort.html">DbTxn::abort</a>,
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<a href="../api_cxx/txn_begin.html">DbEnv::txn_begin</a>,
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<a href="../api_cxx/txn_checkpoint.html">DbEnv::txn_checkpoint</a>,
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<a href="../api_cxx/txn_commit.html">DbTxn::commit</a>,
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<a href="../api_cxx/txn_discard.html">DbTxn::discard</a>,
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<a href="../api_cxx/txn_id.html">DbTxn::id</a>,
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<a href="../api_cxx/txn_prepare.html">DbTxn::prepare</a>,
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<a href="../api_cxx/txn_recover.html">DbEnv::txn_recover</a>,
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<a href="../api_cxx/txn_stat.html">DbEnv::txn_stat</a>.
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