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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 9-1 is an actual Statspack report from an Oracle Database 10g Release 2 system that was experiencing severe cache buffer chain (CBC) latch contention. The Load Profile section appears near the top of both the Statspack and AWR reports. Over the Statspack reporting duration, on average, Oracle processed 0.22 transaction each second, 145,325 logical IOs per second, and 415 user calls per second. These reports have captured an initial value and ending value from a specific statistic, such as commits, database calls, or perhaps redo generated. Figure 9-1. Shown is a Statspack Load Profile section from an active Oracle Database 10g Release 2 system experiencing serious CBC latch contention. Each load profile metric can be used to represent the arrival rate (the workload). The following is an example of how we could gather the arrival rate, expressed in user calls per second, over a 5-minute (300-second) period. 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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