DB->set_priority()

#include <db.h>

int
DB->set_priority(DB *db, DB_CACHE_PRIORITY priority);  

Set the cache priority for pages referenced by the DB 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->set_priority() method is only advisory, and does not guarantee pages will be treated in a specific way.

The DB->set_priority() method may be called at any time during the life of the application.

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

Parameters

priority

The priority parameter must be set to one of the following values:

• DB_PRIORITY_VERY_LOW

  The lowest priority: pages are the most likely to be discarded.

• DB_PRIORITY_LOW

  The next lowest priority.

• DB_PRIORITY_DEFAULT

  The default priority.

• DB_PRIORITY_HIGH

  The next highest priority.

• DB_PRIORITY_VERY_HIGH

  The highest priority: pages are the least likely to be discarded.

Class

DB

See Also

Database and Related Methods