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12C New Optimizer Features

in SQL Performance (MOSC)

Every new version of Oracle database has a new version of optimizer which possibly plays the most important role in customer's application/query performance.

12c has new features of optimizer as well.  The biggest change in 12c is the new feature called Adaptive Query Optimization.  'Adaptive Query Optimization is a set
of capabilities that enable the optimizer to make run time adjustments to execution plans and discover additional information that can lead  to better statistics.' The

following is a graph showing the component of adaptive query optimization:

To read further details on how adaptive query optimization works, please read our white paper:

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