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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. ------------------------------- When Oracle was first written, the LRU algorithm was extremely simple. Figure 6-16 shows a single LRU chain with the important standard LRU algorithm elements highlighted. Figure 6-16. A single LRU chain with the important standard LRU algorithm aspects highlighted: the least recently used (LRU) end and the most recently used (MRU) end. Regardless of Oracle's LRU algorithm, every Oracle LRU chain has a least recently used (LRU) end. It also has a most recently used (MRU) end. In very general terms, the more popular buffer headers will reside near the MRU end, and the less popular buffers will reside near the LRU end. 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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