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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. ------------------------------- As detailed in the previous sections, for each of your samples (perhaps a single sample or hundreds), get the sample interval time, total CPU consumption (total service time), total non-idle wait time (total queue time), and workload for your selected unit of work (total arrivals). Then for each sample, calculate the arrival rate, service time, and queue time. Continuing with our example, Figure 9-2 shows the sample interval to be 149.97 minutes in which the logical IO value (sum of db block gets and consistent gets) is 1,307,632,010. Here is the arrival rate math: Based on Figure 9-3, the total service time is 16,881.6 seconds, or 16,881,600 milliseconds. Determine the service time by dividing the total service time by the unit of work value. Here is the service time math: 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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