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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 I'll detail in the next section, using basic query theory math, you can construct a graph similar to Figure 9-11 or Figure 9-12 with only a single peak time 1-hour interval sample (for example, from Statspack or AWR). To help you get started creating a response-time graph, I created a five-step process. You can use this process regardless of the database server bottleneck and even if you have a single sample or hundreds. Enjoy! If the database server is the bottleneck, then the database server bottleneck will be either CPU, IO, or some lock/blocking (for example, enqueues) issue. Your graph will reflect either the general queue time increase of an IO bottleneck or the steep and dramatic elbow of a CPU bottleneck. Figure 9-8 is a good guide, as it contrasts both the CPU and IO bottlenecks. 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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