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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. ------------------------------- * The hidden parameter _shared_pool_reserved_pct, which defaults to 5 (for 5%), can be used instead of shared_pool_reserved_size. * A relatively large object is defined by the instance parameter _shared_pool_reserved_min_alloc, which defaults to 4,400 bytes. Interesting, notice the default threshold value of 4,400 bytes is just larger than the typical single chunk request of 4,096 bytes. So, by default, Oracle is saying that any memory request larger than one typical size memory chunk request is to be considered large and therefore should get its memory from the reserved size. Either of the first two parameters can be used to set the memory size exclusively reserved for the relatively large objects. If you set one of the parameters, Oracle calculates the other.5 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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