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<h2 class="title" style="clear: both"><a id="mempset_lsn_offset"></a>DbMpoolFile::set_lsn_offset()</h2>
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<pre class="programlisting">#include <db_cxx.h>
int DbMpoolFile::set_lsn_offset(int32_t lsn_offset); </pre>
<p>
The <code class="methodname">DbMpoolFile::set_lsn_offset()</code> method specifies the zero-based
byte offset of a log sequence number
(<a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a>) on the file's pages, for
the purposes of page-flushing as part of transaction checkpoint. (See
the <a class="xref" href="mempsync.html" title="DbEnv::memp_sync()">DbEnv::memp_sync()</a>
documentation for more information.)
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<p>
The <code class="methodname">DbMpoolFile::set_lsn_offset()</code> method configures a file in the
cache, not only operations performed using the specified
<a class="link" href="memp.html" title="Chapter 9. The DbMpoolFile Handle">DbMpoolFile</a> handle.
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<p>
The <code class="methodname">DbMpoolFile::set_lsn_offset()</code> method may not be called after the
<a class="xref" href="mempfopen.html" title="DbMpoolFile::open()">DbMpoolFile::open()</a>
method is called. If the file is already open in the cache when
<a class="xref" href="mempfopen.html" title="DbMpoolFile::open()">DbMpoolFile::open()</a> is
called, the information specified to <code class="methodname">DbMpoolFile::set_lsn_offset()</code>
must be consistent with the existing file or an error will be returned.
</p>
<p>
The <code class="methodname">DbMpoolFile::set_lsn_offset()</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.
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<h3 class="title"><a id="id1697065"></a>Parameters</h3>
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<h4 class="title"><a id="id1697056"></a>lsn_offset</h4>
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<p>
The <span class="bold"><strong>lsn_offset</strong></span> parameter is the
zero-based byte offset of the log sequence number on the file's pages.
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>, <a class="link" href="memp.html" title="Chapter 9. The DbMpoolFile Handle">DbMpoolFile</a>
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<h3 class="title"><a id="id1697251"></a>See Also</h3>
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<a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a>
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