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199 lines
7.8 KiB
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199 lines
7.8 KiB
HTML
<?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>DB_ENV->log_get_config()</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="lsn.html" title="Chapter 7. The DB_LSN Handle" />
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<link rel="prev" href="logflush.html" title="DB_ENV->log_flush()" />
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<link rel="next" href="logprintf.html" title="DB_ENV->log_printf()" />
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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">DB_ENV->log_get_config()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="logflush.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 7.
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The DB_LSN Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="logprintf.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="envlog_get_config"></a>DB_ENV->log_get_config()</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.h>
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int
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DB_ENV->log_get_config(DB_ENV *dbenv, u_int32_t which, int *onoffp); </pre>
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<p>
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The <code class="methodname">DB_ENV->log_get_config()</code> method returns whether the specified
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<span class="bold"><strong>which</strong></span> parameter is currently set or
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not. You can manage this value using the
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<a class="xref" href="envlog_set_config.html" title="DB_ENV->log_set_config()">DB_ENV->log_set_config()</a>
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method.
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</p>
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<p>
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The <code class="methodname">DB_ENV->log_get_config()</code> method may be called at any time during
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the life of the application.
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</p>
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<p>
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The <code class="methodname">DB_ENV->log_get_config()</code> <span>
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<span>
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method returns a non-zero error value on failure and 0 on success.
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</span>
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</span>
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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="id3908000"></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="id3908209"></a>which</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>which</strong></span> parameter is the message
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value for which configuration is being checked. Must be set to one of the following values:
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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><a id="log_get_config_DB_LOG_DIRECT"></a>
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<code class="literal">DB_LOG_DIRECT</code>
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</p>
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<p>
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System buffering is turned off for Berkeley DB log files to avoid double
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caching.
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</p>
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</li>
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<li>
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<p><a id="log_get_config_DB_LOG_DSYNC"></a>
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<code class="literal">DB_LOG_DSYNC</code>
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</p>
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<p>
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Berkeley DB is configured to flush log writes to the backing disk before
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returning from the write system call, rather than flushing log writes
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explicitly in a separate system call, as necessary.
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</p>
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</li>
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<li>
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<p><a id="log_get_config_DB_LOG_AUTO_REMOVE"></a>
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<code class="literal">DB_LOG_AUTO_REMOVE</code>
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</p>
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<p>
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Berkeley DB automatically removes log files that are no
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longer needed.
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</p>
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</li>
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<li>
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<p><a id="log_get_config_DB_LOG_IN_MEMORY"></a>
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<code class="literal">DB_LOG_IN_MEMORY</code>
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</p>
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<p>
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Transaction logs are maintained in memory rather than on disk. This
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means that transactions exhibit the ACI (atomicity, consistency, and
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isolation) properties, but not D (durability).
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</p>
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</li>
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<li>
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<p><a id="log_get_config_DB_LOG_ZERO"></a>
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<code class="literal">DB_LOG_ZERO</code>
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</p>
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<p>
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All pages of a log file are zeroed when that log file is created.
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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 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="id3908536"></a>onoffp</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>onoffp</strong></span> parameter references
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memory into which the configuration of the specified <span class="bold"><strong>which</strong></span> parameter is copied.
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</p>
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<p>
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If the returned <span class="bold"><strong>onoff</strong></span> value is zero, the
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parameter is off; otherwise, on.
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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="id3908540"></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 DB_ENV Handle">DB_ENV</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="id3908576"></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="lsn.html#loglist" title="Logging Subsystem and Related Methods">Logging Subsystem and Related Methods</a>,
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<a class="xref" href="envlog_set_config.html" title="DB_ENV->log_set_config()">DB_ENV->log_set_config()</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="logflush.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="lsn.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="logprintf.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">DB_ENV->log_flush() </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"> DB_ENV->log_printf()</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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