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 5. Analyzing SQL performance data using iSeries Navigator 167
No indexes are being advised.
Tables scans no longer occurring.
5.6.3 Why is CQE being used?
Since we know that SQE is the strategic direction for SQL on i5/OS, let us next try to
determine why this query is being routed CQE. Although the runtime improvement already
achieved by creating the indexes is impressive, perhaps we can improve it even further by
ensuring that it is processed by the SQL Query Engine rather than the Classic Query Engine.
As a review, here are the SQE restrictions at V5R4. A query with any of the following
attributes will be routed to CQE:
Sort sequences ...
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