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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. ------------------------------- As DBAs, when faced with a large, time-consuming data import, we instinctively ask, "Can we break up the import by users, and then run them all at the same time?" We are trying to parallelize! And Oracle gets involved as well. It has multiple background processes running in parallel, Oracle parallel query, Oracle Parallel Server (excuse me, I meant to write Real Application Clusters), and distributed queries. Operating system vendors try to take a single process and break it up into multiple smaller processes so performance is not constrained to a single process. In effect, they are trying to transform the situation from diagram B in Figure 3-1 to diagram A, in the hopes of increasing performance. And I'm sure the CPU vendors themselves are highly involved in reducing serialization. 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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