Re: RULE versus CHOOSE - sorry it's long

On Friday 06 July 2001 06:41, Koivu, Lisa wrote:

> Choose invokes the cost based optimizer (CBO). If the
> optimizer_goal = RULE, it is rule, period (RBO).

Not true Lisa.

Try setting parallel degree > 1 on a table, do an explain plan on a SELECT and see what happens.

Certain operations require CBO, and CBO will be invoked regardless of the CHOOSE setting.

Jared

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Author: Jared Still
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