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  Oracle Tips by Burleson

Use of the KEEP Pool

The KEEP database buffer pool is configured using the BUFFER_POOL_KEEP initialization parameter, which looks like this:

BUFFER_POOL_KEEP = ‘100,2’


In Oracle, this becomes DB_KEEP_CACHE_SIZE and is specified in megabytes.

The two specified parameters are, respectively, the number of buffers from the default pool to assign to the KEEP pool and the number of LRU (least recently used) latches to assign to the KEEP pool. The minimum number of buffers assigned to the pool is 50 times the number of assigned latches. The KEEP pool, as its name implies, is used to store object data that shouldn’t be aged out of the buffer pool, such as lookup information and specific performance-enhancing indexes. The objects are assigned to the KEEP pool either through their creation statement or by specifically assigning them to the pool using the ALTER command. Blocks already in the default pool are not affected by the ALTER command, only subsequently accessed blocks are.

The KEEP pool should be sized such that it can hold all the blocks from all of the tables created with the buffer pool set to KEEP.


This is an excerpt by Mike Ault’s book “Oracle Administration & Management” .  If you want more current Oracle tips by Mike Ault, check out his new book “Mike Ault’s Oracle Internals Monitoring & Tuning Scripts” or Ault’s Oracle Scripts Download.

  
 

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