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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. ------------------------------- Must be set to false. At the time of this writing, RAC does not support IMU. I suspect the algorithms to support RAC IMU are much more complicated and could induce all sorts of bizarre dependency and ordering (think redo) situations. There are a few ways to monitor IMU activity. (Detecting and resolving performance problems are covered in the next section.) You cannot directly control the memory Oracle allocates to the IMU buffers. However, you can possibly indirectly influence Oracle's IMU memory allocation by altering the shared pool size by changing, for example, the shared_pool_size instance parameter. The current IMU memory allocation can be easily queried, as shown in the following code snippet: 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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