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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. ------------------------------- With both requirements and capacity defined and the data collection covered, let's use them together. The classic requirements-versus-capacity indicator is utilization. It can be applied in a wide variety of situations-from river water flow and factory production to Oracle performance analysis. To calculate Oracle's CPU utilization, we need Oracle's CPU requirements (consumption) and the operating system's CPU capacity. Figure 9-3 provides the CPU requirements of 16,881.6 seconds of CPU and Figure 9-6 provides the capacity details of two CPU cores. Figure 9-2 provides the sample interval necessary to complete the CPU capacity calculation. We place these numbers into the utilization formula: This means that during the reporting interval, the Oracle instance consumed 94% of the available CPU! This also means that only 6% CPU power remains for all other processes. Obviously, this server is experiencing a severe CPU bottleneck. 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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