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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 6-13. This OSM script is based on DBA_EXTENTS. For a given file number and block number, it produces information that can be used in a variety of situations, such as helping to resolve buffer cloning issues. Please remember that having many clones may not present a performance issue. If it is in fact a performance problem, CBC latching contention will clearly be an issue. If this is the case and you spot a cloned buffer, then consider the following as possible remedies: * Fix the application. This is usually what must be done. It's painful, requires meetings, can get very personal if the application developer is involved, and usually requires the application to be modified in some way to reduce the popularity of the single cloned buffer. 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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