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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. ------------------------------- I will focus on the iostat report because it provides more detail than the sar -d report and filer sysstat IO reports. Plus, if you understand the iostat report, you can easily understand the others. Figure 4-22 is a typical iostat report for a very small IO subsystem. It is common for a thousand lines to be returned. When studying the IO subsystem, it can be a good idea to load the iostat data into Oracle and filter on the response time (await, svctm) and utilization (%util) columns to find offensive IO patterns. The iostat report can be initially overwhelming, but you need to look at only a few columns to determine if there is a performance problem. The manual pages are also very comprehensive, so you can refer to them. Here are brief descriptions of the key columns: 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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