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<h2 class="title" style="clear: both"><a id="envset_lk_tablesize"></a>DbEnv::set_lk_tablesize()</h2>
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<pre class="programlisting">#include <db_cxx.h>
int
DbEnv::set_lk_tablesize(u_int32_t tablesize); </pre>
<p>
Sets the number of buckets in the lock object
hash table in the Berkeley DB
environment. The default value is estimated based on defaults,
initial and (deprecated) maximum settings of the number of lock
objects allocated. The maximum memory allocation is also
considered. The table is generally set to be close to the number
of lock objects in the system to avoid collisions and delay in
processing lock operations.
</p>
<p>
The database environment's tablesize 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_tablesize", one
or more whitespace characters, and the size of the table. 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">DbEnv::set_lk_tablesize()</code> method configures a database
environment, not only operations performed using the specified
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle.
</p>
<p>
The <code class="methodname">DbEnv::set_lk_tablesize()</code> method may not be called after the
<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> method is
called. If the database environment already exists when
<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> is called, the
information specified to <code class="methodname">DbEnv::set_lk_tablesize()</code> will be ignored.
</p>
<p>
The <code class="methodname">DbEnv::set_lk_tablesize()</code> <span>
<span>
method either returns a non-zero error value or throws an
exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
</span>
</span>
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<div class="sect2" lang="en" xml:lang="en">
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<h3 class="title"><a id="idp8017488"></a>Parameters</h3>
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<h4 class="title"><a id="idp8016840"></a>tablesize</h4>
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<p>
The <span class="bold"><strong>tablesize</strong></span> parameter provides the
size of the lock object hash table to be configured in the
Berkeley DB environment.
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<h3 class="title"><a id="idp7999664"></a>Errors</h3>
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<p>
The <code class="methodname">DbEnv::set_lk_tablesize()</code> <span>
<span>
method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors:
</span>
</span>
</p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
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<h4 class="title"><a id="idp8026896"></a>EINVAL</h4>
</div>
</div>
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<p>
If the method was called after <a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a>
was called; or if an invalid flag value or parameter was specified.
</p>
</div>
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<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
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<div>
<h3 class="title"><a id="idp8028224"></a>Class</h3>
</div>
</div>
</div>
<p>
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>,
<a class="link" href="lock.html" title="Chapter 7. The DbLock Handle">DbLock</a>
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<h3 class="title"><a id="idp8019216"></a>See Also</h3>
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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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