Chapter 11.1

Operational Analytics: Response Time

Abstract

At the heart of success in the operational environment is transaction response time. Transactions are at the heart of many businesses, and when the computer malfunctions, the business suffers. The journey a transaction has to take is a long journey through the computer. The single largest impediment to good performance is the I/O operation. When the I/O operation is executed, the computer operates at mechanical speeds, not electronic speeds. The effect of I/O on performance is especially important in the face of a program that has to do lots of I/Os. When one transaction in the job stream has to do lots of I/Os, queue time can result. When queue time becomes a factor, a transaction ...

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