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>Notice in Table 9-4, for all work-related metrics a unit of time was included. By providing a unit of work and time, direct comparisons from the past or with other systems can be made, regardless of the sample interval. It's OK to use interval totals without reference to time, as long as the sample intervals are the same.
p><p>Many Oracle systems contain a mix of online and batch processing, or perhaps more online-focused during the day and batch-focused during the night. Obviously, improving batch processing performance is just as important as improving online processing.
p><p>There is a significant difference or shift in focus when working on batch processes. Our concern shifts from response time per unit of work to total response time. In other words, we are more concerned about how long it takes to process 500MB of IO or 5,000 seconds of CPU compared to the response time of a single physical IO. Another way of looking at this is our unit of work becomes the entire batch process or a step in the batch process.
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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