DB_MPOOLFILE->set_lsn_offset()
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## DB_MPOOLFILE->set_lsn_offset()

    #include <db.h>

    int
    DB_MPOOLFILE->set_lsn_offset(DB_MPOOLFILE *mpf, int32_t lsn_offset);

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

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

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

The `DB_MPOOLFILE->set_lsn_offset()` method returns a non-zero error value on failure and 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

DB_ENV, DB_MPOOLFILE

### See Also

Memory Pools and Related Methods

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