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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. ------------------------------- Have you ever wondered why there is no view v$bc for the buffer cache? That's because a buffer and a block's metadata are stored in the buffer header, and it's the metadata we usually need for our performance analysis. So the view is named v$bh, for buffer header. * Cache buffers chains (CBCs) are used to quickly determine if an Oracle block resides in the buffer cache. * The least recently used (LRU) lists are used to keep popular buffers in the cache and to find free buffers. 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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