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 Oracle subsystem is focused on the Oracle instance and database. Oracle response-time analysis (discussed later in this chapter) is used to diagnose this circle, and solutions are directly targeted at what can be done to improve the Oracle response time. The application subsystem is focused on SQL, application processes, programs, modules, and so on. The Oracle response-time analysis will direct you to what type of SQL is causing contention in Oracle, and probably consuming a tremendous amount of operating system resources.
</p><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>
©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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