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  Oracle Tips by Burleson

Use of the RECYCLE Pool

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

BUFFER_POOL_RECYCLE = ‘1000,5’

In Oracle9i, this becomes DB_RECYCLE_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 RECYCLE 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 RECYCLE pool, as its name implies, is used to store object data that should be aged out of the buffer pool rapidly, such as searchable LOB information. The objects are assigned to the RECYCLE 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.

As long as the RECYCLE pool shows low block contention, it is sized correctly. With the above setpoints for the default, KEEP and RECYCLE pools, the default pool would end up with 900 buffers and 3 LRU latches.


This is an excerpt by Mike Ault’s book “Oracle9i 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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