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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. ------------------------------- If the top wait event is free buffer waits, focus on the pull, not the push. If you forget this, you will devise inappropriate solutions. The operating system could be suffering from either or both (it quickly flips between the two) a CPU and an IO bottleneck, but probably an IO bottleneck. In my personal experience, a free buffer waits event has never been solved by focusing on the operating system. It has always been a combination of working at the problem from an Oracle and application perspective. If there is a CPU bottleneck, look for non-Oracle CPU-consuming processes. * Increase the buffer cache. If there is memory available, increase the buffer cache. This will allow more room for buffers, which increases the likelihood of finding a free buffer. 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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