#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.