RE: consistency in cost?

Jared,
The only difference is about a weeks worth of extra data. Well, the hardware is also different (Ultra450 vs. Ultra 5000. Also 1 vs 4 CPU). But regardless, shouldn't init.ora optimizer_mode=choose be identical to optimizer_mode=rule with hint=choose? If I have the time, I'll try to set up a couple of systems and examine by moving stats and taking some 10053 dumps. (one of the ones giving me a problem is in production so I have limited play time there).

Henry

-----Original Message-----
Sent: Tuesday, May 08, 2001 12:56 AM
To: ORACLE-L_at_fatcity.com; Henry Poras

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: Henry Poras
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