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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. ------------------------------- Suppose it's Friday afternoon. You've looked at your database Statspack reports and had a short conversation with your operating system administrator. You've found that between 1 p.m. and 2 p.m., the following occurred: * Average user call activity was 1,510 uc/sec; that is, 5,400,000 user calls occurred in the one-hour time span. This will be the arrival rate (the workload). * CBC latch contention accounted for 90% of the total wait time; that is, 28,920 seconds. So nearly all of the wait time (queue time) is related to CBC latch contention. 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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