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 6. Custom Database Monitor Analysis 191
The report was organized by the number of times advised in descending sequence by table
and advised keys.
Figure 6-10 Index Advised analysis
6.1.17 The 3030 record: materialized query table
Enhancements have been added to the Database Monitor data to indicate usage of
materialized query tables (MQT).
1000/3006 record: QQC22 has a new reason code of B5, which indicates that the access
plan needed to be rebuilt because the MQT was no longer eligible to be used. The
reasons might be that:
– The MQT no longer exists
– A new MQT was found
– The enable or disable query optimization changed
– Time since the ...
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