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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. ------------------------------- 1 My original "Direct Connection Identification Using Oracle's Wait Interface" paper has had thousands and thousands of downloads. It quickly became the foundation upon which all of my performance analyses were based. This paper is still available from the OraPub web site (go to http://www.orapub.com and search for "direct contention"). 3 As I'll detail in the Chapter 4, there are occasions where Oracle records that a session is consuming CPU when actually the session is waiting in the CPU run queue. Oracle controls serial access to memory using latches and mutexes. When a serialization issue develops, Oracle DBAs feel it in their gut, because they know they will need to go deep-sometimes very deep-into Oracle internals. 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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