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122 lines
4.8 KiB
HTML
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<title>set_lk_detect</title>
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<link rel="up" href="configuration_reference.html" title="Appendix B. DB_CONFIG Parameter Reference" />
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<link rel="prev" href="set_lg_regionmax_parameter.html" title="set_lg_regionmax" />
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<p>Library Version 11.2.5.2</p>
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<tr>
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<th colspan="3" align="center">set_lk_detect</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_regionmax_parameter.html">Prev</a> </td>
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<th width="60%" align="center">Appendix B. DB_CONFIG Parameter Reference</th>
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<td width="20%" align="right"> <a accesskey="n" href="set_lk_max_lockers_parameter.html">Next</a></td>
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</tr>
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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_lk_detect_parameter"></a>set_lk_detect</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 number of locking entities supported by the Berkeley DB
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environment. This value is used by Berkeley DB to estimate how much
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space to allocate for various lock-table data structures.
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When using the DB, the default value is 2,000 lockers.
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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
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<code class="literal">set_lk_detect</code>, one or more whitespace
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characters, and the method <span class="bold"><strong>detect
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</strong></span>parameter as a string. The detect parameter
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configures the deadlock detector. The deadlock detector
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will reject the lock request with the lowest priority. If
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multiple lock requests have the lowest priority, then the
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detect parameter is used to select which of those lock
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requests to reject.
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</p>
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<p>
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For example:
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</p>
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<pre class="programlisting">set_lk_detect DB_LOCK_OLDEST</pre>
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<p>
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Sets the deadlock detector such that the lock request for
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the locker ID with the oldest lock is rejected.
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</p>
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<p>
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The <span class="bold"><strong>detect</strong></span> parameter
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values are:
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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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DB_LOCK_DEFAULT
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</li>
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<li>
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DB_LOCK_EXPIRE
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</li>
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<li>
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DB_LOCK_MAXLOCKS
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</li>
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<li>
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DB_LOCK_MAXWRITE
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</li>
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<li>
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DB_LOCK_MINLOCKS
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</li>
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<li>
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DB_LOCK_MINWRITE
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</li>
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<li>
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DB_LOCK_OLDEST
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</li>
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<li>
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DB_LOCK_RANDOM
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</li>
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<li>
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DB_LOCK_YOUNGEST
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</li>
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</ul>
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</div>
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<p>For more information, see <a class="xref" href="envset_lk_detect.html" title="DbEnv::set_lk_detect()">DbEnv::set_lk_detect()</a>. </p>
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</div>
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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_regionmax_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_lk_max_lockers_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_regionmax </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_lk_max_lockers</td>
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