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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. ------------------------------- To summarize, the operating system is not experiencing a shortage of capacity in the classic sense. The Oracle system is predominantly consuming CPU resources, yet due to Oracle and operating system scalability limitations, the operating system CPU is only 28% utilized. As a result, an Oracle server process is primarily bound by CPU speed, which translates into service time. Figure 9-22 provides the metrics for our operating system investigation. While not shown, neither the network or memory subsystem is an issue. Figure 9-22. Shown is the operating system analysis information entered into a firefighting diagnostic template. There is no CPU or IO bottleneck. Oracle is consuming 26.1% of the CPU resources, and based on vmstat observations and v$osstat data, CPU utilization is around 28%. The IO subsystem is responding to IO requests in less than 1 ms! All IO data was gathered from the Oracle v$sysstat performance view. 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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