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<!--$Id: txn_commit.so,v 10.27 2000/12/31 19:26:21 bostic Exp $-->
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<h1>DbTxn.commit</h1>
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<h3><pre>
import com.sleepycat.db.*;
<p>
public void commit(u_int32_t flags)
throws DbException;
</pre></h3>
<h1>Description</h1>
<p>The DbTxn.commit method ends the transaction. In the case of nested
transactions, if the transaction is a parent transaction, committing
the parent transaction causes all unresolved children of the parent to
be committed.
<p>In the case of nested transactions, if the transaction is a child
transaction, its locks are not released, but are acquired by its parent.
While the commit of the child transaction will succeed, the actual
resolution of the child transaction is postponed until the parent
transaction is committed or aborted, i.e., if its parent transaction
commits, it will be committed, and if its parent transaction aborts, it
will be aborted.
<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.DB_TXN_NOSYNC">Db.DB_TXN_NOSYNC</a><dd>Do not synchronously flush the log. This means the transaction will
exhibit the ACI (atomicity, consistency and isolation) properties, but
not D (durability), i.e., database integrity will be maintained but it is
possible that this transaction may be undone during recovery instead of
being redone.
<p>This behavior may be set for an entire Berkeley DB environment as part of the
<a href="../api_java/env_set_flags.html">DbEnv.set_flags</a> interface.
<p><dt><a name="Db.DB_TXN_SYNC">Db.DB_TXN_SYNC</a><dd>Synchronously flush the log. This means the transaction will exhibit
all of the ACID (atomicity, consistency and isolation and durability)
properties.
<p>This behavior is the default for Berkeley DB environments unless the
<a href="../api_java/env_open.html#DB_TXN_NOSYNC">Db.DB_TXN_NOSYNC</a> flag was specified to the <a href="../api_java/env_set_flags.html">DbEnv.set_flags</a>
or <a href="../api_java/txn_begin.html">DbEnv.txn_begin</a> interfaces.
</dl>
<p>Once the DbTxn.commit method returns, the <a href="../api_java/txn_class.html">DbTxn</a> handle may not
be accessed again. If DbTxn.commit encounters an error, the
transaction and all child transactions of the transaction are aborted.
<p>The DbTxn.commit method throws an exception that encapsulates a non-zero error value on
failure.
<h1>Errors</h1>
<p>The DbTxn.commit method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbTxn.commit method may fail and throw
a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>, in which case all subsequent Berkeley DB calls
will fail in the same way.
<h3>Classes</h3>
<a href="../api_java/dbenv_class.html">DbEnv</a>, <a href="../api_java/txn_class.html">DbTxn</a>
<h1>See Also</h1>
<a href="../api_java/env_set_tx_max.html">DbEnv.set_tx_max</a>,
<a href="../api_java/env_set_tx_timestamp.html">DbEnv.set_tx_timestamp</a>,
<a href="../api_java/txn_abort.html">DbTxn.abort</a>,
<a href="../api_java/txn_begin.html">DbEnv.txn_begin</a>,
<a href="../api_java/txn_checkpoint.html">DbEnv.txn_checkpoint</a>,
<a href="../api_java/txn_commit.html">DbTxn.commit</a>,
<a href="../api_java/txn_id.html">DbTxn.id</a>,
<a href="../api_java/txn_prepare.html">DbTxn.prepare</a>
and
<a href="../api_java/txn_stat.html">DbEnv.txn_stat</a>.
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