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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. ------------------------------- I tell my students that if presented with a multiple-choice exam question about where a memory object resides in Oracle, and you're not sure, always guess it's in the shared pool. Oracle's shared pool is packed full of all types of memory structures-everything from shared SQL to undo related structures.1 If that's not scary enough, consider this simple query: While there are hundreds of objects in the shared pool, as performance specialists, we must have a solid understanding of the following key objects (or areas): * SQL (cursors): These statements contain the essence of the shared pool. In this chapter, I will provide details about cursors, but for now, think of a cursor as a chunk of memory connected to many other memory chunks containing information key to the proper functioning of the SQL statement. 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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