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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. ------------------------------- Figure 9-28 shows the operating system is looking even better than before! The CPU utilization dropped from 28% to 20%, and the IO subsystem is receiving from Oracle less than 1 MB/s in read and writes. So, it appears that increasing the Oracle buffer cache has had a very positive effect on resource consumption. Figure 9-28. Shown is the operating system analysis information. Compared to Figure 9-22, Oracle CPU consumption dropped to 17%, and the operating system CPU utilization dropped from 28% to 20%. Since the utilization significantly dropped, we should not expect a large increase in the workload. At this point, the only way to decrease CPU-related response time is to either use faster CPUs or reduce the SQL statement logical IO consumption (tune or balance). While additional CPUs may provide more CPU capacity, Oracle and the operating system are not able to fully take advantage of the existing four cores (for details, see the scalability discussion near the end of this chapter). 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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