Oracle CBO. Query Transformer

by Kamil Stawiarski

Oracle Cost Based Optimizer consists of three main components: Query Transformer, Esitmator, Plan Generator. In this article I will try to show you some interesting features of the first component – Query Transformer. This component has some very powerful features and most of them remain in shadows, unrevealed while other new features gains all the credit on all conferences and presentations. I think that the understanding of CBO mechanisms is crucial for writing good queries and resolving of many bugs.

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