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Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
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<th colspan="3" align="center">DB_ENV-&gt;set_lk_max_locks()</th>
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<td width="20%" align="left"><a accesskey="p" href="envset_lk_max_lockers.html">Prev</a> </td>
<th width="60%" align="center">Chapter 6. 
The DB_LOCK Handle
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<div class="sect1" lang="en" xml:lang="en">
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<h2 class="title" style="clear: both"><a id="envset_lk_max_locks"></a>DB_ENV-&gt;set_lk_max_locks()</h2>
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<pre class="programlisting">#include &lt;db.h&gt;
int
DB_ENV-&gt;set_lk_max_locks(DB_ENV *dbenv, u_int32_t max); </pre>
<p>
This method is deprecated. Instead, use
<a class="xref" href="envset_memory_init.html" title="DB_ENV-&gt;set_memory_init()">DB_ENV-&gt;set_memory_init()</a>,
<a class="xref" href="envset_memory_max.html" title="DB_ENV-&gt;set_memory_max()">DB_ENV-&gt;set_memory_max()</a>, and
<a class="xref" href="envset_lk_tablesize.html" title="DB_ENV-&gt;set_lk_tablesize()">DB_ENV-&gt;set_lk_tablesize()</a>.
</p>
<p>
Set the maximum number of locks supported by the Berkeley DB
environment. This value is used by
<a class="xref" href="envopen.html" title="DB_ENV-&gt;open()">DB_ENV-&gt;open()</a> to estimate how
much space to allocate for various lock-table data structures.
The default value is 1000 locks.
The final value specified for the locks should be more than or equal to
the number of lock table partitions.
For specific information on configuring
the size of the lock subsystem, see
<a href="../../programmer_reference/lock_max.html" class="olink">Configuring locking: sizing the system</a>.
</p>
<p>
The database environment's maximum number of locks may also be
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
the entry in that file is a single line with the string
"set_lk_max_locks", one or more whitespace characters, and the
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
database environment is opened, it will silently overrule
configuration done before that time.
</p>
<p>
The <code class="methodname">DB_ENV-&gt;set_lk_max_locks()</code> method configures a database
environment, not only operations performed using the specified
<a class="link" href="env.html" title="Chapter 5.  The DB_ENV Handle">DB_ENV</a> handle.
</p>
<p>
The <code class="methodname">DB_ENV-&gt;set_lk_max_locks()</code> method may not be called after the
<a class="xref" href="envopen.html" title="DB_ENV-&gt;open()">DB_ENV-&gt;open()</a> method is
called. If the database environment already exists when
<a class="xref" href="envopen.html" title="DB_ENV-&gt;open()">DB_ENV-&gt;open()</a> is called, the
information specified to <code class="methodname">DB_ENV-&gt;set_lk_max_locks()</code> will be ignored.
</p>
<p>
The <code class="methodname">DB_ENV-&gt;set_lk_max_locks()</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>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h3 class="title"><a id="id3721579"></a>Parameters</h3>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h4 class="title"><a id="id3722200"></a>max</h4>
Release 5.2.28 on 6/10/2011
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</div>
</div>
</div>
<p>
The <span class="bold"><strong>max</strong></span> parameter is the maximum
number of locks supported by the Berkeley DB environment.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h3 class="title"><a id="id3722063"></a>Errors</h3>
Release 5.2.28 on 6/10/2011
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</div>
</div>
</div>
<p>
The <code class="methodname">DB_ENV-&gt;set_lk_max_locks()</code> <span>
<span>
method may fail and return one of the following non-zero errors:
</span>
</span>
</p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h4 class="title"><a id="id3722370"></a>EINVAL</h4>
Release 5.2.28 on 6/10/2011
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</div>
</div>
</div>
<p>
If the method was called after <a class="xref" href="envopen.html" title="DB_ENV-&gt;open()">DB_ENV-&gt;open()</a>
was called; or if an invalid flag value or parameter was specified.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
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<h3 class="title"><a id="id3722212"></a>Class</h3>
Release 5.2.28 on 6/10/2011
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</div>
</div>
</div>
<p>
<a class="link" href="env.html" title="Chapter 5.  The DB_ENV Handle">DB_ENV</a>,
<a class="link" href="lock.html" title="Chapter 6.  The DB_LOCK Handle">DB_LOCK</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h3 class="title"><a id="id3722335"></a>See Also</h3>
Release 5.2.28 on 6/10/2011
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</div>
</div>
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<p>
<a class="xref" href="lock.html#locklist" title="Locking Subsystem and Related Methods">Locking Subsystem and Related Methods</a>
</p>
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