# DbMpoolFile::set_ftype |

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    #include <db_cxx.h>

    int
    DbMpoolFile::set(int ftype);

# Description

The DbMpoolFile::set_ftype method specifies a file type for the purposes of input or output processing of the files pages as they are read from or written to, the backing filesystem store. The ftype argument must be the same as a ftype argument previously specified to the DbEnv::memp_register method. (See the DbEnv::memp_register documentation for more information.)

The DbMpoolFile::set_ftype method configures a file in the memory pool, not only operations performed using the specified DbMpoolFile handle.

The DbMpoolFile::set_ftype interface may not be called after the DbMpoolFile::open interface is called. If the file is already open in the memory pool when DbMpoolFile::open is called, the information specified to DbMpoolFile::set_ftype will replace the existing information.

The DbMpoolFile::set_ftype 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.

# Errors

The DbMpoolFile::set_ftype 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::set_ftype method may fail and either return DB_RUNRECOVERY or throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DbEnv, DbMpoolFile

# See Also

Memory Pools and Related Methods`

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