# DB_MPOOLFILE->set_lsn_offset

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    #include <db.h>

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

# Description

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 memory pool, not only operations performed using the specified DB_MPOOLFILE handle.

The DB_MPOOLFILE->set_lsn_offset interface may not be called after the DB_MPOOLFILE->open interface is called. If the file is already open in the memory pool 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.

# Errors

The DB_MPOOLFILE->set_lsn_offset method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB_MPOOLFILE->set_lsn_offset method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DB_ENV, DB_MPOOLFILE

# See Also

Memory Pools and Related Methods`

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