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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. ------------------------------- 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. Database server CPU capacity is calculated in the same manner as the Oracle CPU utilization. Placing both the requirements and capacity into the utilization formula and applying the appropriate conversion factors, we have this calculation: This means the CPU subsystem is operating on average at 100% utilization! We should have expected this, since Oracle is consuming 94% of all the available CPU. Calculating both Oracle CPU utilization and the operating system CPU utilization, we have a very nice confirmation that this is the only instance running on the database server and also that the CPU subsystem is experiencing a raging 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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