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by Craig Shallahamer Get the book here |
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Craig Shallahamer's Blog
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. To order the book in either print or PDF form, click here. ©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. ------------------------------- The touch count threshold a buffer header must meet or exceed to be promoted. If you want to make it more difficult for a buffer to be promoted, increase this value. Then only really hot buffers will remain in the cache. The touch count reset value when a buffer header is promoted. Consistent read and segment header blocks are exempt. The touch count reset value when a buffer header crosses from the hot region into the cold region. Decreasing this will make it more difficult for a buffer header to be promoted. 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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