March 2004
Intermediate to advanced
440 pages
11h 46m
English
book
DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
by Whei-Jen Chen, Peter Z He, Kang Yong Ying, Andreas Paulsen, Sunminder S Saini
Content preview from DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
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250 DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
7.1.3 Explain utilities
When DB2 UDB is requested to retrieve data, it uses an optimizer to determine
which access plan is the most efficient one. It is possible to see the access plan
that DB2 UDB created and to view how expensive the retrieval is.
The optimizer uses several inputs to calculate the best access plan. Information
like the speed and count of CPUs and disks is important. DB2 calculates the
CPU speed during the installation and stores it in the database manager
configuration parameter CPUSPEED. This value should not be changed unless
you are modeling a different hardware environment. If you change the CPUs in a
machine, you can set the value to -1 to have
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