|
Server : Apache/2.4.62 System : FreeBSD fbsdweb2.web.rcn.net 14.1-RELEASE FreeBSD 14.1-RELEASE releng/14.1-n267679-10e31f0946d8 GENERIC amd64 User : www ( 80) PHP Version : 8.3.8 Disable Function : NONE Directory : /usr/local/share/doc/db18/api_reference/CXX/ |
Upload File : |
<?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>set_lk_detect</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="configuration_reference.html" title="Appendix B. DB_CONFIG Parameter Reference" />
<link rel="prev" href="set_lg_regionmax_parameter.html" title="set_lg_regionmax" />
<link rel="next" href="set_lk_max_lockers_parameter.html" title="set_lk_max_lockers" />
</head>
<body>
<div xmlns="" class="navheader">
<div class="libver">
<p>Library Version 18.1.40</p>
</div>
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">set_lk_detect</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="set_lg_regionmax_parameter.html">Prev</a> </td>
<th width="60%" align="center">Appendix B. DB_CONFIG Parameter Reference</th>
<td width="20%" align="right"> <a accesskey="n" href="set_lk_max_lockers_parameter.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="set_lk_detect_parameter"></a>set_lk_detect</h2>
</div>
</div>
</div>
<p>
Sets the maximum number of locking entities supported by the Berkeley DB
environment. This value is used by Berkeley DB to estimate how much
space to allocate for various lock-table data structures.
When using the DB, the default value is 2,000 lockers.
</p>
<p>
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
single line with the string
<code class="literal">set_lk_detect</code>, one or more whitespace
characters, and the method <span class="bold"><strong>detect
</strong></span>parameter as a string. The detect parameter
configures the deadlock detector. The deadlock detector
will reject the lock request with the lowest priority. If
multiple lock requests have the lowest priority, then the
detect parameter is used to select which of those lock
requests to reject.
</p>
<p>
For example:
</p>
<pre class="programlisting">set_lk_detect DB_LOCK_OLDEST</pre>
<p>
Sets the deadlock detector such that the lock request for
the locker ID with the oldest lock is rejected.
</p>
<p>
The <span class="bold"><strong>detect</strong></span> parameter
values are:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
DB_LOCK_DEFAULT
</li>
<li>
DB_LOCK_EXPIRE
</li>
<li>
DB_LOCK_MAXLOCKS
</li>
<li>
DB_LOCK_MAXWRITE
</li>
<li>
DB_LOCK_MINLOCKS
</li>
<li>
DB_LOCK_MINWRITE
</li>
<li>
DB_LOCK_OLDEST
</li>
<li>
DB_LOCK_RANDOM
</li>
<li>
DB_LOCK_YOUNGEST
</li>
</ul>
</div>
<p>For more information, see <a class="xref" href="envset_lk_detect.html" title="DbEnv::set_lk_detect()">
<span>DbEnv::set_lk_detect()</span>
</a>. </p>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="set_lg_regionmax_parameter.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="configuration_reference.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="set_lk_max_lockers_parameter.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">set_lg_regionmax </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> set_lk_max_lockers</td>
</tr>
</table>
</div>
</body>
</html>