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 419
why a query may be routed to CQE, putting the numeric expression in a separate host
variable is a good programming practice.
Figure 12-6 SQE implements with an index in either case
12.2.6 Using the LIKE predicate
The percent sign (%) and the underline (_), when used in the pattern of a LIKE predicate,
specify a character string that is similar to the column value of rows that you want to select.
Such queries can take advantage of indexes when used to denote characters in the middle or
at the end of a character string. However, when used at the beginning of a character string, ...
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