DB2® Universal Database for OS/390® Version 7.1 Certification Guide

Elements of Performance

Performance is the way a computer system behaves given a particular work load. Performance is measured through one or more of the system's response time, throughput, and availability. It is affected by:

• The resources available

• How well the resources are utilized

Performance tuning should be undertaken when you want to improve the cost-benefit ratio of your system. Specific situations include:

• Processing a larger, more demanding work load without increasing processing costs that may include having to acquire additional hardware

• Obtaining faster system response time, or higher throughput, without increasing processing costs

• Reducing processing costs without negatively affecting service to the client(s)

Translating performance ...