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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 least recently used (LRU) lists are used to keep popular buffers in the cache and to find free buffers. It is important to understand that the buffer headers, not the actual buffers, make up these three lists. I will provide details about these lists later in this chapter. Figure 6-5 shows the relationship between a single buffer header and the various lists. For example, buffer header BH 100 is on LRU 1 and also on CBC 2. Buffer header BH 180 is on CBC 1 and also on Write List 1. A three-dimensional figure would show that a single buffer header always resides on a CBC and either an LRU chain or a write list. 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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