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<h2 class="title" style="clear: both"><a id="envset_lg_dir"></a>DbEnv::set_lg_dir()</h2>
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<pre class="programlisting">#include <db_cxx.h>
int
DbEnv::set_lg_dir(const char *dir); </pre>
<p>
The path of a directory to be used as the location of logging files.
Log files created by the Log Manager subsystem will be created in this
directory.
</p>
<p>
If no logging directory is specified, log files are created in the
environment home directory. See <a href="../../programmer_reference/env_naming.html" class="olink">Berkeley DB File Naming</a> for more
information.
</p>
<p>
For the greatest degree of recoverability from system or application
failure, database files and log files should be located on separate
physical devices.
</p>
<p>
The database environment's logging directory 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_dir", one or more whitespace characters, and the directory
name. 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_dir()</code> method configures operations performed using
the specified <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
handle, not all operations performed on the underlying database
environment.
</p>
<p>
The <code class="methodname">DbEnv::set_lg_dir()</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_dir()</code> must be consistent with
the existing environment or corruption can occur.
</p>
<p>
The <code class="methodname">DbEnv::set_lg_dir()</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>
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
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<div>
<h3 class="title"><a id="id1688099"></a>Parameters</h3>
</div>
</div>
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<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id1688080"></a>dir</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>dir</strong></span> parameter is the directory
used to store the logging files.
</p>
<p>
When using a Unicode build on Windows (the default), the
<span class="bold"><strong>dir</strong></span> argument will be interpreted
as a UTF-8 string, which is equivalent to ASCII for Latin characters.
</p>
</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div>
<div>
<h3 class="title"><a id="id1688271"></a>Errors</h3>
</div>
</div>
</div>
<p>
The <code class="methodname">DbEnv::set_lg_dir()</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>
<div>
<h4 class="title"><a id="id1687839"></a>EINVAL</h4>
</div>
</div>
</div>
<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>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="id1688103"></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="logc.html" title="The DbLogc Handle">DbLogc</a>,
<a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
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<div>
<h3 class="title"><a id="id1688075"></a>See Also</h3>
</div>
</div>
</div>
<p>
<a class="xref" href="lsn.html#loglist" title="Logging Subsystem and Related Methods">Logging Subsystem and Related Methods</a>
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