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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. ------------------------------- 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. 4 The instance statistic physical reads signifies the number of Oracle blocks that Oracle server processes had to request from the operating system because the blocks did not reside in Oracle's buffer cache 6 There is a more precise response-time formula based on Mr. Agner Krarup Erlang's (1878-1929) famous ErlangC formula used to study telephone networks. For details on this formula, see Forecasting Oracle Performance (Apress, 2007), Chapter 3, "Increasing Forecast Precision." 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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