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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. ------------------------------- When a transaction arrives into a system ready to be serviced, it may need to wait, or queue, before servicing begins. Service time does not include wait time; that is, queue time. For example, when an IO subsystem is 2.2% utilized, the entire IO processing time is virtually all service time and no queue time. Queue time can be calculated a number of ways. The simplest way, which is sufficient for our purposes, is to subtract the service time from the total request time: The total request time is more formally called response time and is discussed in the next section. The units for queue time are the same as for service time, such as milliseconds per logical IO. 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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