Craig Shallahamer's Blog
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You were brought to this page based on an internet search
and as a free service to Oracle DBAs.
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.
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<p>The operating system analysis is focused on finding the operating system bottleneck, which will be the CPU, memory, IO, or network. Unless the problem is outside the database server, or there is an Oracle or application blocking or locking issue, there will be an operating system bottleneck.
p><p>The benefits of the 3-circle analysis method are many and should quickly become obvious. As you read about the following benefits, consider how they would have helped you in previous firefighting situations.
p><p>* Different perspectives reduce risk. An ancient proverb says, "Plans fail for lack of counsel, but with many advisers they succeed."7 When your analysis is based on three connected yet distinct perspectives, your chances of making a mistake are greatly diminished. In addition, I cannot overstate the power of analyzing the operating system bottleneck from an operating system perspective, or finding the problem SQL based on what both Oracle and the operating system are telling you. If your operating system and Oracle analysis do not support each other, then you are missing something. Once you have confirmed your analysis from multiple perspectives, the risk of a misdiagnosis is greatly reduced.
p>
©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.
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