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>At this point, I should have good performance data available, some user hope and confidence, the objectives clearly defined, and the performance baselines established. Now, I very methodically perform my analysis, implement the solutions, give the system time to stabilize, gather more data, and repeat until it's time to stop.
p><p>Students and clients frequently ask me how I know when to stop improving performance. The answer, while not providing the warm, fuzzy feeling people may want, is straightforward. I keep working on improving performance until there is no time remaining, no budget remaining, or performance is acceptable. This is a very simple statement, but obviously there is much more to it.
p><p>At some point, it just doesn't make sense to keep chipping away at performance. Diminishing returns are always a factor. For example, the first tuning cycle may improve performance by 50%, the second by an additional 10%, and the next by 5%. Should we keep tuning? Perhaps other options should be considered, such as increasing system capacity or altering the workload. Regardless of how you disguise the situation, it always comes down to time, money, and performance.
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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