<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>DB_ENV->log_get_config()</title> <link rel="stylesheet" href="apiReference.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB C API Reference" /> <link rel="up" href="lsn.html" title="Chapter 7. The DB_LSN Handle" /> <link rel="prev" href="logflush.html" title="DB_ENV->log_flush()" /> <link rel="next" href="logprintf.html" title="DB_ENV->log_printf()" /> </head> <body> <div xmlns="" class="navheader"> <div class="libver"> <p>Library Version 11.2.5.3</p> </div> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">DB_ENV->log_get_config()</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="logflush.html">Prev</a> </td> <th width="60%" align="center">Chapter 7. The DB_LSN Handle </th> <td width="20%" align="right"> <a accesskey="n" href="logprintf.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="envlog_get_config"></a>DB_ENV->log_get_config()</h2> </div> </div> </div> <pre class="programlisting">#include <db.h> int DB_ENV->log_get_config(DB_ENV *dbenv, u_int32_t which, int *onoffp); </pre> <p> The <code class="methodname">DB_ENV->log_get_config()</code> method returns whether the specified <span class="bold"><strong>which</strong></span> parameter is currently set or not. You can manage this value using the <a class="xref" href="envlog_set_config.html" title="DB_ENV->log_set_config()">DB_ENV->log_set_config()</a> method. </p> <p> The <code class="methodname">DB_ENV->log_get_config()</code> method may be called at any time during the life of the application. </p> <p> The <code class="methodname">DB_ENV->log_get_config()</code> <span> <span> method returns a non-zero error value on failure and 0 on success. </span> </span> </p> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp60850016"></a>Parameters</h3> </div> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="idp60838392"></a>which</h4> </div> </div> </div> <p> The <span class="bold"><strong>which</strong></span> parameter is the message value for which configuration is being checked. Must be set to one of the following values: </p> <div class="itemizedlist"> <ul type="disc"> <li> <p><a id="log_get_config_DB_LOG_DIRECT"></a> <code class="literal">DB_LOG_DIRECT</code> </p> <p> System buffering is turned off for Berkeley DB log files to avoid double caching. </p> </li> <li> <p><a id="log_get_config_DB_LOG_DSYNC"></a> <code class="literal">DB_LOG_DSYNC</code> </p> <p> Berkeley DB is configured to flush log writes to the backing disk before returning from the write system call, rather than flushing log writes explicitly in a separate system call, as necessary. </p> </li> <li> <p><a id="log_get_config_DB_LOG_AUTO_REMOVE"></a> <code class="literal">DB_LOG_AUTO_REMOVE</code> </p> <p> Berkeley DB automatically removes log files that are no longer needed. </p> </li> <li> <p><a id="log_get_config_DB_LOG_IN_MEMORY"></a> <code class="literal">DB_LOG_IN_MEMORY</code> </p> <p> Transaction logs are maintained in memory rather than on disk. This means that transactions exhibit the ACI (atomicity, consistency, and isolation) properties, but not D (durability). </p> </li> <li> <p><a id="log_get_config_DB_LOG_ZERO"></a> <code class="literal">DB_LOG_ZERO</code> </p> <p> All pages of a log file are zeroed when that log file is created. </p> </li> </ul> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="idp60870936"></a>onoffp</h4> </div> </div> </div> <p> The <span class="bold"><strong>onoffp</strong></span> parameter references memory into which the configuration of the specified <span class="bold"><strong>which</strong></span> parameter is copied. </p> <p> If the returned <span class="bold"><strong>onoff</strong></span> value is zero, the parameter is off; otherwise, on. </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp60871368"></a>Class</h3> </div> </div> </div> <p> <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a> </p> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp60873344"></a>See Also</h3> </div> </div> </div> <p> <a class="xref" href="lsn.html#loglist" title="Logging Subsystem and Related Methods">Logging Subsystem and Related Methods</a>, <a class="xref" href="envlog_set_config.html" title="DB_ENV->log_set_config()">DB_ENV->log_set_config()</a> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="logflush.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="lsn.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="logprintf.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">DB_ENV->log_flush() </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> DB_ENV->log_printf()</td> </tr> </table> </div> </body> </html>