Oracle in a Nutshell

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Name

OPTIMIZER_MODE

Synopsis

Value: RULE | CHOOSE | FIRST_ROWS_{1 | 10 | 100 | 1000} | FIRST_ROWS | ALL_ROWS

Default: CHOOSE

Dynamic: ALTER SESSION

Specifies the behavior of the optimizer. See Chapter 7 for an explanation of these values. Cost-based optimization will always be used for any query that references an object with a nonzero degree of parallelism.

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