Re: consistency in cost?

Henry,

You say 'nearly identical'.

What are the differences?

Are the 2 databases on the same platform?

If not, what are the differences, hardware and OS?

Jared

On Monday 07 May 2001 21:55, Henry Poras wrote:
> I am working with an 8.1.6 database on Solaris 2.6 and I am wondering if
> there is any consistency in the optimizer. We have two nearly identical
> databases (one a clone from two weeks ago). A five table join has nearly
> the identical execution plan on the two databases. The difference is in the
> access method of the fourth table in the join; in one case it is accessed
> by a FTS and in the other, by Index. This difference has a large effect on
> performance. Statistics are nearly identical for this table in both
> databases (I looked at dba_tables, dba_indexes, dba_col_tables). Also, the
> init.ora is the same. When I changed the optimizer_mode to rule and added a
> 'choose' hint to the query, the execution plan was different again. I will
> look into this a bit further and post my results. Just wondering about
> other's experiences. Thanks.
>
> Henry

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Author: Jared Still
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