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Berkeley DB: DbMpoolFile::set_priority
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DbMpoolFile::set_priority
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#include <db_cxx.h>
int
DbMpoolFile::set_priority(DB_CACHE_PRIORITY priority);
int
DbMpoolFile::get_priority(DB_CACHE_PRIORITY *priorityp);
Description: DbMpoolFile::set_priority
Set the cache priority for pages referenced by the
DbMpoolFile
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 DbMpoolFile::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 DbMpoolFile::set_priority method using the DbMpoolFile handle
returned by the Db::get_mpf method.
The DbMpoolFile::set_priority method configures a file in the memory pool, not only
operations performed using the specified DbMpoolFile handle.
The DbMpoolFile::set_priority method may be called at any time during the life of the
application.
The DbMpoolFile::set_priority 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.
Parameters
priority
Description: DbMpoolFile::get_priority
The DbMpoolFile::get_priority method returns the cache priority for the file referenced by the DbMpoolFile handle.
The DbMpoolFile::get_priority method may be called at any time during the life of the
application.
The DbMpoolFile::get_priority method
either returns a non-zero error value
or throws an exception that encapsulates a non-zero error value on
failure
Class
DbEnv, DbMpoolFile
See Also
Memory Pools and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.