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Donald K. Burleson

Oracle Tips


Find Oracle Buffer Busy Waits

Buffer busy waits occur when a process needs to access a data block in the buffer cache but cannot because it is being used by another process.  So, it must wait.  Buffer busy waits normally center around contention for rollback segments, too small an initrans setting for tables, or insufficient freelists for tables. 

The remedy for each situation would be to increase the number of rollback segments, or to alter tables for larger initrans settings to allow for more transactions per data block, and more freelists.  Note that the automatic segment management feature in Oracle9i locally-managed tablespaces can make the freelist problem a thing of the past, while the UNDO tablespace feature of 9i can help remedy any rollback contention problem

The above is an excerpt from Oracle Performance Troubleshooting by Robin Schumacher.

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