DB_MPOOLFILE->set_flags()

#include <db.h>

int
DB_MPOOLFILE->set_flags(DB_MPOOLFILE *mpf, u_int32_t flags, int onoff)  

Configure a file in the cache.

To set the flags for a particular database, call the DB_MPOOLFILE->set_flags() method using the DB_MPOOLFILE handle stored in the mpf field of the DB handle.

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

Parameters

flags

The flags parameter must be set by bitwise inclusively OR'ing together one or more of the following values:

• DB_MPOOL_NOFILE

  If set, no backing temporary file will be opened for the specified in-memory database, even if it expands to fill the entire cache. Attempts to create new database pages after the cache has been filled will fail.

  The DB_MPOOL_NOFILE flag configures a file in the cache, not only operations performed using the specified DB_MPOOLFILE handle.

  The DB_MPOOL_NOFILE flag may be used to configure Berkeley DB at any time during the life of the application.

• DB_MPOOL_UNLINK

  If set, remove the file when the last reference to it is closed.

  The DB_MPOOL_ULINK flag configures a file in the cache, not only operations performed using the specified DB_MPOOLFILE handle.

  The DB_MPOOL_ULINK flag may be used to configure Berkeley DB at any time during the life of the application.

onoff

If onoff is zero, the specified flags are cleared; otherwise they are set.

Class

DB_ENV, DB_MPOOLFILE

See Also

Memory Pools and Related Methods