March 2007
Intermediate to advanced
488 pages
13h 46m
English
book
OnDemand SQL Performance Analysis Simplified on DB2 for i5/OS in V5R4
by Hernando Bedoya, Jaime Gaug, James Kerl, Ser Ser NG, Jose Cardoso dos Santos
Content preview from OnDemand SQL Performance Analysis Simplified on DB2 for i5/OS in V5R4
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Chapter 3. Overview of tools to analyze database performance 67
3.7 Evaluators
In this section, we cover two very useful tools that we have named the Evaluators. The tools
are:
Index Evaluator
MQT Evaluator
3.7.1 Index Evaluator
Prior to V5R3, there was no easy way to determine if there were any unnecessary indexes
over a physical file or table. No information specified whether an index was used by a query
or when an index was used to give statistics to the query optimizer. The only information
available was from the Last Used Date. Unfortunately, customers erroneously used the date
to determine whether an index was used recently, and if it was ...
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