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<!--Id: memp_set_lsn_offset.so,v 10.2 2001/10/22 15:24:37 bostic Exp -->
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<title>Berkeley DB: DbMpoolFile::set_lsn_offset</title>
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<h1>DbMpoolFile::set_lsn_offset</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
int
DbMpoolFile::set(int32_t lsn_offset);
</pre></h3>
<h1>Description</h1>
<p>The DbMpoolFile::set_lsn_offset method specifies the zero-based byte offset
of a log sequence number (<a href="../api_cxx/lsn_class.html">DbLsn</a>) on the file's pages, for the
purposes of page-flushing as part of transaction checkpoint. (See the
<a href="../api_cxx/memp_sync.html">DbEnv::memp_sync</a> documentation for more information.)
<p>The DbMpoolFile::set_lsn_offset 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.
<h1>Errors</h1>
<p>The DbMpoolFile::set_lsn_offset method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbMpoolFile::set_lsn_offset method may fail and either
return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw an exception encapsulating
<a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>, in which case all subsequent Berkeley DB calls will fail
in the same way.
<h1>Class</h1>
<a href="../api_cxx/dbenv_class.html">DbEnv</a>, <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a>
<h1>See Also</h1>
<a href="../api_cxx/env_set_cachesize.html">DbEnv::set_cachesize</a>,
<a href="../api_cxx/env_set_mp_mmapsize.html">DbEnv::set_mp_mmapsize</a>,
<a href="../api_cxx/memp_fcreate.html">DbEnv::memp_fcreate</a>,
<a href="../api_cxx/memp_fclose.html">DbMpoolFile::close</a>,
<a href="../api_cxx/memp_fget.html">DbMpoolFile::get</a>,
<a href="../api_cxx/memp_fopen.html">DbMpoolFile::open</a>,
<a href="../api_cxx/memp_fput.html">DbMpoolFile::put</a>,
<a href="../api_cxx/memp_fset.html">DbMpoolFile::set</a>,
<a href="../api_cxx/memp_fsync.html">DbMpoolFile::sync</a>,
<a href="../api_cxx/memp_register.html">DbEnv::memp_register</a>,
<a href="../api_cxx/memp_set_clear_len.html">DbMpoolFile::set_clear_len</a>,
<a href="../api_cxx/memp_set_fileid.html">DbMpoolFile::set_fileid</a>,
<a href="../api_cxx/memp_set_ftype.html">DbMpoolFile::set_ftype</a>,
<a href="../api_cxx/memp_set_lsn_offset.html">DbMpoolFile::set_lsn_offset</a>,
<a href="../api_cxx/memp_set_pgcookie.html">DbMpoolFile::set_pgcookie</a>,
<a href="../api_cxx/memp_stat.html">DbEnv::memp_stat</a>,
<a href="../api_cxx/memp_sync.html">DbEnv::memp_sync</a>,
and
<a href="../api_cxx/memp_trickle.html">DbEnv::memp_trickle</a>.
</tt>
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