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Execution Plan Changes when the OPTIMIZER_FEATURES_ENABLED Parameter is Changed, But Why?

by SSWUG Research

(Charles Hooper) A question appeared on the OTN Database forums yesterday that has yet to receive an answer. The question was essentially, why did the execution plan change when the OPTIMIZER_FEATURES_ENABLED parameter was adjusted from 11.2.0.2 to 11.1.0.7, and why did the execution performance im

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Execution Plan Changes when the OPTIMIZER_FEATURES_ENABLED Parameter is Changed, But Why?

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