DbMpoolFile::set_lsn_offset()
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## DbMpoolFile::set_lsn_offset()

    #include <db_cxx.h>

    int DbMpoolFile::set_lsn_offset(int32_t lsn_offset);

The `DbMpoolFile::set_lsn_offset()` method specifies the zero-based byte offset of a log sequence number (DbLsn) on the file's pages, for the purposes of page-flushing as part of transaction checkpoint. (See the DbEnv::memp_sync() documentation for more information.)

The `DbMpoolFile::set_lsn_offset()` method configures a file in the cache, not only operations performed using the specified DbMpoolFile handle.

The `DbMpoolFile::set_lsn_offset()` method may not be called after the DbMpoolFile::open() method is called. If the file is already open in the cache when DbMpoolFile::open() is called, the information specified to `DbMpoolFile::set_lsn_offset()` must be consistent with the existing file or an error will be returned.

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.

### Parameters

#### lsn_offset

The lsn_offset parameter is the zero-based byte offset of the log sequence number on the file's pages.

### Class

DbEnv, DbMpoolFile

### See Also

Memory Pools and Related Methods

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