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 12. Tips to proactively prevent SQL performance problems 415
Figure 12-3 shows the selection of a specific row using the SQL scalar function RRN()
compared to using that row’s key.
Figure 12-3 Row selection by using the SQL scalar function RRN() compared to using a key
12.2.4 Avoid numeric data type conversion
When a column value and a host variable (or constant value) are being compared, try to
specify the same data types and attributes. A query that uses CQE does not use an index for
the named column if the host variable or constant value has a greater precision than the
precision of the column.
However, if you have different numeric ...
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