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Asked: 2026-05-11T13:42:47+00:00

I have a parameterized query. Depending on parameter values optimal query plan varies significantly.

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I have a parameterized query. Depending on parameter values optimal query plan varies significantly. Here is the trouble: Oracle uses the plan from the first query invocation for subsequent invocations resulting in bad performance. I deal with it by dynamic SQL but this way is far from elegant. So the question is: is there a way to tell Oracle that the query plan must be recalculated?

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  1. For Oracle 10g we would choose any table in the query and execute

    GRANT SELECT ON table1 TO user1;

    This would invalidate the plan of any query referencing this table. Of course you would want to choose a table which has minimal impact on other queries. See also this page for more information and a sample listing.

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