### DB_MPOOLFILE->set

`

###

    #include <db.h>

    int
    DB_MPOOLFILE->set(DB_MPOOLFILE *mpf, void *pgaddr, u_int32_t flags);

### Description: DB_MPOOLFILE->set

The DB_MPOOLFILE->set method sets the attributes of a cache page.

The DB_MPOOLFILE->set method returns a non-zero error value on failure and 0 on success.

### Parameters

pgaddr
  The pgaddr parameter is the address of the page for which attributes are to be set. he pgaddr parameter must be an address previously returned by DB_MPOOLFILE->get.
flags
  The flags parameter must be set to 0 or by bitwise inclusively OR'ing together one or more of the following values:
  DB_MPOOL_CLEAN
    Clear any previously set modification information (that is, don't bother writing the page back to the source file).
  DB_MPOOL_DIRTY
    The page has been modified and must be written to the source file before being evicted from the pool.
  DB_MPOOL_DISCARD
    The page is unlikely to be useful in the near future, and should be discarded before other pages in the pool.

  The DB_MPOOL_CLEAN and DB_MPOOL_DIRTY flags are mutually exclusive.

### Errors

The DB_MPOOLFILE->set method may fail and return one of the following non-zero errors:

EINVAL
  An invalid flag value or parameter was specified.

### Class

DB_ENV, DB_MPOOLFILE

### See Also

Memory Pools and Related Methods`

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