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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. ------------------------------- * Increase the number of IMU latches. Keep in mind that just because the number of IMU latches increases, this does not mean Oracle will actually use them. Run a query like the one shown in Figure 7-18 to better understand the true usage situation. Here are a couple ways to increase the number of IMU latches: * Increase the instance parameter, processes. Be careful, as this parameter affects many other instance parameters. * Increase the number of IMU pools by increasing the _im_pools parameter or increase the shared pool size by increasing the shared_pool_size parameter. These changes only encourage Oracle to create additional latches, so you may want to do some testing by running a script similar to that shown in Figure 7-18. 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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