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190 lines
8.2 KiB
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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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->set_lk_max_locks()</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="lock.html" title="Chapter 6. The DB_LOCK Handle" />
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<link rel="prev" href="envset_lk_max_lockers.html" title="DB_ENV->set_lk_max_lockers()" />
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<p>Library Version 11.2.5.3</p>
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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->set_lk_max_locks()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="envset_lk_max_lockers.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 6.
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The DB_LOCK Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="envset_lk_max_objects.html">Next</a></td>
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<hr />
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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="envset_lk_max_locks"></a>DB_ENV->set_lk_max_locks()</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->set_lk_max_locks(DB_ENV *dbenv, u_int32_t max); </pre>
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<p>
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This method is deprecated. Instead, use
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<a class="xref" href="envset_memory_init.html" title="DB_ENV->set_memory_init()">DB_ENV->set_memory_init()</a>,
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<a class="xref" href="envset_memory_max.html" title="DB_ENV->set_memory_max()">DB_ENV->set_memory_max()</a>, and
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<a class="xref" href="envset_lk_tablesize.html" title="DB_ENV->set_lk_tablesize()">DB_ENV->set_lk_tablesize()</a>.
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</p>
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<p>
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Set the maximum number of locks supported by the Berkeley DB
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environment. This value is used by
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<a class="xref" href="envopen.html" title="DB_ENV->open()">DB_ENV->open()</a> to estimate how
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much space to allocate for various lock-table data structures.
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The default value is 1000 locks.
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The final value specified for the locks should be more than or equal to
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the number of lock table partitions.
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For specific information on configuring
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the size of the lock subsystem, see
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<a href="../../programmer_reference/lock_max.html" class="olink">Configuring locking: sizing the system</a>.
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</p>
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<p>
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The database environment's maximum number of locks may also be
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configured using the environment's <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file. The syntax of
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the entry in that file is a single line with the string
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"set_lk_max_locks", one or more whitespace characters, and the
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number of locks. Because the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is read when the
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database environment is opened, it will silently overrule
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configuration done before that time.
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</p>
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<p>
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The <code class="methodname">DB_ENV->set_lk_max_locks()</code> method configures a database
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environment, not only operations performed using the specified
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<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a> handle.
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</p>
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<p>
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The <code class="methodname">DB_ENV->set_lk_max_locks()</code> method may not be called after the
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<a class="xref" href="envopen.html" title="DB_ENV->open()">DB_ENV->open()</a> method is
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called. If the database environment already exists when
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<a class="xref" href="envopen.html" title="DB_ENV->open()">DB_ENV->open()</a> is called, the
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information specified to <code class="methodname">DB_ENV->set_lk_max_locks()</code> will be ignored.
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</p>
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<p>
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The <code class="methodname">DB_ENV->set_lk_max_locks()</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="idp60497304"></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="idp60497496"></a>max</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>max</strong></span> parameter is the maximum
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number of locks supported by the Berkeley DB environment.
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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="idp60489080"></a>Errors</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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The <code class="methodname">DB_ENV->set_lk_max_locks()</code> <span>
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<span>
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method may fail and return one of the following non-zero errors:
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</span>
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</span>
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</p>
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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="idp60507992"></a>EINVAL</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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If the method was called after <a class="xref" href="envopen.html" title="DB_ENV->open()">DB_ENV->open()</a>
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was called; or if an invalid flag value or parameter was specified.
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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="idp60506912"></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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<a class="link" href="lock.html" title="Chapter 6. The DB_LOCK Handle">DB_LOCK</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="idp60510064"></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="lock.html#locklist" title="Locking Subsystem and Related Methods">Locking Subsystem and Related Methods</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="envset_lk_max_lockers.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="lock.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="envset_lk_max_objects.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->set_lk_max_lockers() </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->set_lk_max_objects()</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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