mirror of
https://github.com/yasuhirokimura/db18
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Yasuhiro KIMURA
100 lines
4.7 KiB
HTML
100 lines
4.7 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>set_lg_max</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="configuration_reference.html" title="Appendix D. DB_CONFIG Parameter Reference" />
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<link rel="prev" href="set_lg_filemode_parameter.html" title="set_lg_filemode" />
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<link rel="next" href="set_lg_regionmax_parameter.html" title="set_lg_regionmax" />
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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 18.1.40</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">set_lg_max</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="set_lg_filemode_parameter.html">Prev</a> </td>
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<th width="60%" align="center">Appendix D. DB_CONFIG Parameter Reference</th>
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<td width="20%" align="right"> <a accesskey="n" href="set_lg_regionmax_parameter.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="set_lg_max_parameter"></a>set_lg_max</h2>
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</div>
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</div>
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</div>
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<p>
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Sets the maximum size of a single file in the log, in bytes.
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The value set for this parameter may not be larger than the
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maximum unsigned four-byte value.
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</p>
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<p>
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When the logging subsystem is configured for on-disk logging, the
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default size of a log file is 10MB.
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</p>
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<p>
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When the logging subsystem is configured for in-memory logging, the
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default size of a log file is 256KB. In addition, the configured log
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buffer size must be larger than the log file size. (The logging
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subsystem divides memory configured for in-memory log records into
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"files", as database environments configured for in-memory log records
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may exchange log records with other members of a replication group,
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and those members may be configured to store log records on-disk.)
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When choosing log buffer and file sizes for in-memory logs,
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applications should ensure the in-memory log buffer size is large
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enough that no transaction will ever span the entire buffer, and avoid
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a state where the in-memory buffer is full and no space can be freed
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because a transaction that started in the first log "file" is still
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active.
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</p>
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<p>
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The syntax of this parameter in the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is a
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single line with the string <code class="literal">set_lg_max</code>,
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one or more whitespace characters, and the maximum log
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file size in bytes.
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</p>
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<p>
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If the database environment already exists when this parameter is
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changed, it is ignored. To change this value after the environment
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has been created, re-create your environment.
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</p>
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<p>For more information, see <a class="xref" href="envset_lg_max.html" title="DB_ENV->set_lg_max()">
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<span>DB_ENV->set_lg_max()</span>
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</a>. </p>
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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="set_lg_filemode_parameter.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="configuration_reference.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="set_lg_regionmax_parameter.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">set_lg_filemode </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"> set_lg_regionmax</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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