Re: Cause for explain plan differences? - probably a basic question

Exactly. If you don't have stats on the tables, CHOOSE means RULE, ie no COST.

If, on the other hand, you have stats on at least one of the involved tables, CHOOSE means cost-based, and more specifically it means ALL_ROWS, which is usually not what you want.

Vladimir Begun wrote:

> On Jun 10, 2001 at 11:30:23PM, Szecsy Tamas wrote:
> > Hi,
> >
> > I have two database instances 816SE and 817EE on WinNT. For the same query I
> > get different result as follows (optimizer_mode=CHOOSE).
>
> Did you analyze the tables?
>
> --
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