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<h2 class="title" style="clear: both"><a id="envset_lg_regionmax"></a>DbEnv::set_lg_regionmax()</h2>
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<pre class="programlisting">#include <db_cxx.h>
int
DbEnv::set_lg_regionmax(u_int32_t lg_regionmax); </pre>
<p>
Set the size of the underlying logging area of the Berkeley DB
environment, in bytes. By default, or if the value is set to 0, the
minimum region size is used, approximately 128KB. The log region is
used to store filenames, and so may need to be increased in size if a
large number of files will be opened and registered with the specified
Berkeley DB environment's log manager.
</p>
<p>
The database environment's log region size 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_lg_regionmax", one or more whitespace characters, and the size in
bytes. 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_lg_regionmax()</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_lg_regionmax()</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_lg_regionmax()</code> will be ignored.
</p>
<p>
The <code class="methodname">DbEnv::set_lg_regionmax()</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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<h3 class="title"><a id="id1688738"></a>Parameters</h3>
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<h4 class="title"><a id="id1688659"></a>lg_regionmax</h4>
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<p>
The <span class="bold"><strong>lg_regionmax</strong></span> parameter is the
size of the logging area in the Berkeley DB environment, in bytes.
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<h3 class="title"><a id="id1688901"></a>Errors</h3>
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<p>
The <code class="methodname">DbEnv::set_lg_regionmax()</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>
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<div class="sect3" lang="en" xml:lang="en">
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<h4 class="title"><a id="id1688827"></a>EINVAL</h4>
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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>
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<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
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<h3 class="title"><a id="id1688828"></a>Class</h3>
</div>
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<p>
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>,
<a class="link" href="logc.html" title="The DbLogc Handle">DbLogc</a>,
<a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a>
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<h3 class="title"><a id="id1688693"></a>See Also</h3>
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<a class="xref" href="lsn.html#loglist" title="Logging Subsystem and Related Methods">Logging Subsystem and Related Methods</a>
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