Oracle Performance Firefighting
by Craig Shallahamer

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The text below is an except from the book, Oracle Performance Firefighting, written by Craig Shallahamer of OraPub, Inc. Figures and tables are not included on this page, only their reference.
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©2009, 2010 by Craig Shallahamer. This is copyrighted material.
Please—Out of respect for those involved in the creation of the book and also for their familes, we ask you to respect the copyright both in intent and deed. Thank you.

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* Increase CPU power. Just as with CBC latch contention, or any other latch contention for that matter, if more CPU power is available, memory management will take less time. This means latch hold time and also latching acquisition time (both spinning and sleeping) could be reduced. Increasing CPU power also means looking for creative ways to reduce CPU consumption during peak contention times.

* Increase LRU latches. By default, most Oracle systems have only 8 to 32 LRU chain latches. LRU concurrency can be increased by adding latches, which means increasing the hidden parameter _db_block_lru_latches. This can be especially effective if you have a multigigabyte buffer cache.

* Use multiple buffer pools. A creative strategy to take some of the strain off the main LRU chains is to implement the keep and recycle pools. All buffer pools can have their number of LRU chain latches increased. They also use the touch-count algorithm, and therefore have similar touch count instance parameters, such as _db_percent_hot_keep.

©2009, 2010 by Craig Shallahamer. This is copyrighted material.
Please—Out of respect for those involved in the creation of the book and also for their familes, we ask you to respect the copyright both in intent and deed. Thank you.


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