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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. ------------------------------- 1 The number of CPUs or the number of CPU threads does not accurately reflect the processing power for an Oracle-based system. There are many reasons for this, but in summary, this is based on Oracle's multiple process architecture that can take advantage of multiple cores, but not so much multiple threads per core or CPU. 2 This is true for multicore CPU subsystems. The greater the number of CPU cores, the flatter the response-time curve and the steeper the elbow of the curve. 3 Oracle does not guaratentee all system calls are instrumented. As a result, there can be missing time. Also, Oracle CPU consumption includes Oracle processes waiting for CPU and also queuing for CPU. As a result, in a CPU-saturated system, Oracle may report CPU consumption higher than actually occurred. 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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