# DbMpoolFile::sync

`

###

    #include <db_cxx.h>

    int
    DbMpoolFile::sync();

# Description

The DbMpoolFile::sync method writes all pages associated with the DbMpoolFile, that were marked as modified using DbMpoolFile::put or DbMpoolFile::set, back to the source file. If any of the modified pages are also pinned (i.e., currently referenced by this or another process) DbMpoolFile::sync will ignore them.

The DbMpoolFile::sync method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, 0 on success, and returns DB_INCOMPLETE if there were pages which were modified but which DbMpoolFile::sync was unable to write immediately.

# Errors

The DbMpoolFile::sync 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::sync method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

### Classes

DbEnv, DbMpoolFile

# See Also

DbEnv::set_mp_mmapsize, DbMpoolFile::close, DbMpoolFile::get, DbMpoolFile::open, DbMpoolFile::put, DbMpoolFile::set, DbMpoolFile::sync, DbEnv::memp_register, DbEnv::memp_stat, DbEnv::memp_sync and DbEnv::memp_trickle.`

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