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74 lines
3.6 KiB
HTML
<!--$Id: txn_checkpoint.so,v 10.25 2000/09/08 15:20:28 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB: DbEnv.txn_checkpoint</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>DbEnv.txn_checkpoint</h1>
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</td>
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<td width="1%">
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<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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import com.sleepycat.db.*;
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<p>
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int
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public int txn_checkpoint(int kbyte, int min, int flags)
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throws DbException;
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</pre></h3>
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<h1>Description</h1>
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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 only
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done if there has been activity since the last checkpoint and either
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more than <b>min</b> minutes have passed since the last checkpoint,
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or if more than <b>kbyte</b> kilobytes of log data have been written since
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the last checkpoint.
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<p>The <b>flags</b> parameter must be set to 0 or one of the following
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values:
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<p><dl compact>
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<p><dt><a name="Db.DB_FORCE">Db.DB_FORCE</a><dd>Force a checkpoint record even if there has been no activity since the
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last checkpoint.
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</dl>
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<p>The DbEnv.txn_checkpoint method throws an exception that encapsulates a non-zero error value on
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failure, and returns <a href="../api_c/memp_fsync.html#DB_INCOMPLETE">Db.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_java/memp_sync.html">DbEnv.memp_sync</a> was unable
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to write immediately.
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<h1>Errors</h1>
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<p>The DbEnv.txn_checkpoint method may fail and throw an exception encapsulating a non-zero error for the following conditions:
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<p><dl compact>
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<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
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</dl>
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<p>The DbEnv.txn_checkpoint method may fail and throw an exception 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 throw
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a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>, in which case all subsequent Berkeley DB calls
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will fail in the same way.
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<h3>Classes</h3>
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<a href="../api_java/dbenv_class.html">DbEnv</a>, <a href="../api_java/txn_class.html">DbTxn</a>
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<h1>See Also</h1>
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<a href="../api_java/env_set_tx_max.html">DbEnv.set_tx_max</a>,
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<a href="../api_java/env_set_tx_timestamp.html">DbEnv.set_tx_timestamp</a>,
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<a href="../api_java/txn_abort.html">DbTxn.abort</a>,
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<a href="../api_java/txn_begin.html">DbEnv.txn_begin</a>,
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<a href="../api_java/txn_checkpoint.html">DbEnv.txn_checkpoint</a>,
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<a href="../api_java/txn_commit.html">DbTxn.commit</a>,
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<a href="../api_java/txn_id.html">DbTxn.id</a>,
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<a href="../api_java/txn_prepare.html">DbTxn.prepare</a>
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and
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<a href="../api_java/txn_stat.html">DbEnv.txn_stat</a>.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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</body>
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