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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. ------------------------------- While the straight average for the IO read wait times is not shown in the figure, it is calculated as follows: However, the scattered read wait time of 0.093 ms occurs much more frequently than the other waits. A more accurate average calculation would take into account the occurrences of the scattered read waits in addition to its average event wait time. This is called a weighted average, and it is a much better average calculation when working with diverse and highly variant data sets, as we have here. The average calculation, weighted by the total wait time (which includes the weight occurrences) is shown in Figure 9-21. It is calculated as follows: 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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