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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. ------------------------------- It is important to understand this calculation is not the operating system CPU utilization, which can be gathered using an operating system command such as vmstat. What we calculated with this utilization formula is Oracle's CPU consumption related to the database server CPU capacity. This is commonly called the Oracle CPU utilization. Besides gathering operating system CPU utilization using standard operating system commands such as vmstat and sar, starting with Oracle Database 10g, both operating system CPU consumption and CPU capacity details are available through the v$osstat view. We still need the sample interval, which is 149.97 minutes, as shown in Figure 9-2. Database server CPU consumption is shown in the BUSY_TIME statistic in Figure 9-6 and represented in centiseconds. The BUSY_TIME statistics is the sum of any and all database server process CPU consumption during the sample interval. Based on Figure 9-6, during the reporting interval, all operating system processes consumed a total of 1,802,616 centiseconds of CPU. 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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