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Berkeley DB: DB_MPOOLFILE->set_priority
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DB_MPOOLFILE->set_priority
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#include <db.h>
int
DB_MPOOLFILE->set_priority(DB_MPOOLFILE *mpf, DB_CACHE_PRIORITY priority);
int
DB_MPOOLFILE->get_priority(DB_MPOOLFILE *mpf, DB_CACHE_PRIORITY *priorityp);
Description: DB_MPOOLFILE->set_priority
Set the cache priority for pages referenced by the
DB_MPOOLFILE
handle.
The priority of a page biases the replacement algorithm to be more or
less likely to discard a page when space is needed in the buffer pool.
The bias is temporary, and pages will eventually be discarded if they
are not referenced again. The DB_MPOOLFILE->set_priority method is only advisory, and does
not guarantee pages will be treated in a specific way.
To set the priority for the pages belonging to a particular database,
call the DB_MPOOLFILE->set_priority method using the DB_MPOOLFILE handle
returned by the DB->get_mpf method.
The DB_MPOOLFILE->set_priority method configures a file in the memory pool, not only
operations performed using the specified DB_MPOOLFILE handle.
The DB_MPOOLFILE->set_priority method may be called at any time during the life of the
application.
The DB_MPOOLFILE->set_priority method
returns a non-zero error value on failure
and 0 on success.
Parameters
priority
Description: DB_MPOOLFILE->get_priority
The DB_MPOOLFILE->get_priority method returns the cache priority for the file referenced by the DB_MPOOLFILE handle.
The DB_MPOOLFILE->get_priority method may be called at any time during the life of the
application.
The DB_MPOOLFILE->get_priority method
returns a non-zero error value on failure
and 0 on success.
Parameters
priorityp- The DB_MPOOLFILE->get_priority method returns a reference to the
cache priority for the file referenced by the DB_MPOOLFILE handle in priorityp.
Class
DB_ENV, DB_MPOOLFILE
See Also
Memory Pools and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.