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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. ------------------------------- From a more Oracle internals perspective, delaying log writer background process writes so each write will be a full 1MB IO call will maximize log writer efficiency. Based on what I've said, you're probably already thinking about some of these options: * Increase the log buffer size. This will reduce the likelihood of the log buffer filling forcing the log writer to immediately write possibly with less than its full 1MB potential. * Increase the _log_io_size parameter. Changing this parameter to 2048 will ensure the typical 2,048, 512-byte operating size blocks will also generate a full 1MB write. 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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