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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. ------------------------------- 11 Obviously, building a tool to sample v$session can be done. But on a large Oracle system, directly sampling from v$session and then storing that information can easily take over a minute! 12 Now don't panic. Every time I have checked, my inferences and ASH data match perfectly. We just need to be a little more careful and understand what we are viewing. 13 As a side note-and I have tested this-the ASH sample frequency does not affect the time model views update frequency. 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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