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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. ------------------------------- The following is an example of how we could gather the arrival rate, expressed in user calls per second, over a 5-minute (300-second) period. Placing the collected Oracle workload data into the arrival rate formula, expressed in user calls per second, the arrival rate is 1,342.05 uc/s. The Statspack and AWR reports calculate their load profile metrics the same way, but they store the collected data in difference tables and use different sampling techniques. For example, the Statspack facility typically collects data in 60-minute intervals and stores the data in tables starting with stats$ (the key table is stats$snap). The AWR report draws from the WRH$ tables, which contain summarized active session history (ASH) data. With just a little creativity, you can devise your own reports that pull from the Statspack or AWR tables. 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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