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DB2 UDB for LUW (Linux, Unix and Windows)

 
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Performance - Tips & Tricks

Taming the wild cards - REOPT

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Any DBA who has worked on solving performance issues would know about the problems parameter markers and host variables create during query optimization. If you use parameter markers, the query is not compiled every time it is executed, but you end up with a sub-optimal plan since db2 does not know the values that will be passed at query run time.

There is a way out of this situation.
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