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203 lines
7.7 KiB
HTML
203 lines
7.7 KiB
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>DbEnv::txn_checkpoint()</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="txn.html" title="Chapter 13. The DbTxn Handle" />
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<link rel="prev" href="txnbegin.html" title="DbEnv::txn_begin()" />
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<link rel="next" href="txnstat.html" title="DbEnv::txn_stat()" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DbEnv::txn_checkpoint()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="txnbegin.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 13.
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The DbTxn Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="txnstat.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="txncheckpoint"></a>DbEnv::txn_checkpoint()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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int
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DbEnv::txn_checkpoint(u_int32_t kbyte, u_int32_t min,
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u_int32_t flags) const;</pre>
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<p>
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If there has been any logging activity in the database environment
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since the last checkpoint, the <code class="methodname">DbEnv::txn_checkpoint()</code> method
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flushes the underlying memory pool, writes a checkpoint record to the
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log, and then flushes the log.
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</p>
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<p>
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The <code class="methodname">DbEnv::txn_checkpoint()</code> method returns a non-zero error value on
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failure and 0 on success.
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</p>
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<p>
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The <code class="methodname">DbEnv::txn_checkpoint()</code> method is the underlying method used by
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the <a class="link" href="db_checkpoint.html" title="db_checkpoint">db_checkpoint</a>
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utility. See the <a class="link" href="db_checkpoint.html" title="db_checkpoint">db_checkpoint</a> utility
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source code for an example of using <code class="methodname">DbEnv::txn_checkpoint()</code> in a
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IEEE/ANSI Std 1003.1 (POSIX) environment.
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3671644"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3671650"></a>kbyte</h4>
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</div>
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</div>
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</div>
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<p>
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If the <span class="bold"><strong>kbyte</strong></span> parameter is non-zero, a
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checkpoint will be done if more than <span class="bold"><strong>kbyte</strong></span> kilobytes of log data have been written
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since the last checkpoint.
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</p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3671810"></a>min</h4>
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</div>
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</div>
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</div>
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<p>
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If the <span class="bold"><strong>min</strong></span> parameter is non-zero, a
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checkpoint will be done if more than <span class="bold"><strong>min</strong></span> minutes have passed since the last
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checkpoint.
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</p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3672142"></a>flags</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>flags</strong></span> parameter must be set to 0
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or the following value:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<code class="literal">DB_FORCE</code>
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</p>
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<p>
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Force a checkpoint record, even if there has been no activity since
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the last checkpoint.
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</p>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3671672"></a>Errors</h3>
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</div>
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</div>
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</div>
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<p>
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The <code class="methodname">DbEnv::txn_checkpoint()</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3672601"></a>EINVAL</h4>
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</div>
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</div>
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</div>
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<p>
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An invalid flag value or parameter was specified.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3672580"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>, <a class="link" href="txn.html" title="Chapter 13. The DbTxn Handle">DbTxn</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3672504"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="txn.html#txnlist" title="Transaction Subsystem and Related Methods">Transaction Subsystem and Related Methods</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="txnbegin.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="txn.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="txnstat.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DbEnv::txn_begin() </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> DbEnv::txn_stat()</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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