DB_MPOOLFILE->set_ftype()
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## DB_MPOOLFILE->set_ftype()

    #include <db.h>

    int
    DB_MPOOLFILE->set_ftype(DB_MPOOLFILE *mpf, int ftype);

The `DB_MPOOLFILE->set_ftype()` method specifies a file type for the purposes of input or output processing of the file's pages as they are read from or written to, the backing filesystem store.

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

The `DB_MPOOLFILE->set_ftype()` 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_ftype()` will replace the existing information.

The `DB_MPOOLFILE->set_ftype()` method returns a non-zero error value on failure and 0 on success.

### Parameters

#### ftype

The ftype parameter sets the file's type for the purposes of input and output processing. The ftype must be the same as a ftype parameter previously specified to the DB_ENV->memp_register() method.

### Class

DB_ENV, DB_MPOOLFILE

### See Also

Memory Pools and Related Methods

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