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RDBPROD: Changing An Index Selected by the Rdb Optimizer (Doc ID 65156.1)

Last updated on APRIL 18, 2022

Applies to:

Oracle Rdb Server on OpenVMS - Version 4.2 and later
HP OpenVMS Alpha
HP OpenVMS Itanium
HP OpenVMS VAX

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Goal

The index chosen by the RDB optimizer is less efficient than another available index. Applying a query outline will override the decision made by the optimizer, allowing a user to control how the dynamic optimizer executes given queries. In most cases the Rdb Optimizer chooses the most efficient index, so exercise caution when modifying the dynamic optimizer strategy and always test the performance.

Solution

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