RE: strange explain plan

From: Dave Leach <Dave.Leach_at_claybrook.co.uk>
Date: Fri, 06 Jul 2001 08:54:24 -0700
Message-ID: <F001.00342EFA.20010706081156@fatcity.com>

Gene,

This is not much help I'm afraid but are the statistics etc on both the old and new table at the same stage (preferrable both up to date)?.

I've tried to recreate this on NT with no success,

keep me informed.

Dave Leach
-----Original Message-----
Sent: 06 July 2001 14:36
To: Multiple recipients of list ORACLE-L

Hi.

This is a second attempt. My first Email never got posted.

I have the following query:

select a1.MBR_TYP_CDE MBR_TYP_CDE,
(COUNT ( DISTINCT a1.NOVS_NTWRK_MBR_KYD )) DISTINCTALLMERCHCO
from MDSS_STAR.NOVUS_NETWRK_MBR_D a1
group by a1.MBR_TYP_CDE

The explain plan for it is as follows:

0-0-5898 1.5898 SELECT STATEMENT    SQL1 Cost = 5898
1-0-1  2.1 SORT GROUP BY
2-1-1   3.1 SORT GROUP BY
3-2-1    4.1 SORT GROUP BY
4-3-1     5.1 TABLE ACCESS FULL NOVUS_NETWRK_MBR_D

It has three group by's and the query fails with 0ra-0600 [15851].

when I create a new table as select * from the old table the plan changes:

0-0-9721 1.9721 SELECT STATEMENT    SQL1 Cost = 9721
1-0-1  2.1 SORT GROUP BY
2-1-1   3.1 TABLE ACCESS FULL NOVUS_NETWRK_MBR_D_TMP

and the query works. Does anyone have any guess as to what is going on?

thank you for any help

Gene

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Author: Dave Leach
INET: Dave.Leach_at_claybrook.co.uk

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