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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82 OnDemand SQL Performance Analysis Simplified on DB2 for i5/OS in V5R4
Figure 3-51 Running Visual Explain in Current SQL for a job
3.9 Debug messages
Analyzing debug messages is another important tool for monitoring and tuning queries. When
doing so, keep in mind the following points:
The debug messages are no longer being enhanced (that is, no new messages are being
added for queries that go through SQE).
No new messages are being added for queries that go through SQE, for this reason the
SQE optimizer uses the closest CQE message and that message may or may not
accurately reflect the access plan built by the SQE optimizer.
It is hard to ...
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