SQL Performance (MOSC)

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Optimizer

edited May 23, 2013 10:44PM in SQL Performance (MOSC) 21 commentsAnswered
I received below recommendation on an SQL based on a materialised view. Can someone explain me which parameter I should enable and what is the benefit I will get.

Thanks

Restructure SQL

The optimizer could not merge the view at line ID 1 of the execution plan.

Consider enabling complex view merging by using the "MERGE" hint or by setting parameter OPTIMIZER_FEATURES_ENABLE to least 9.0.1.

The optimizer could not merge the complex view at line ID of the execution plan.

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