strange explain plan

From: Gene Gurevich <g_u_r_e_v_i_c_h_at_yahoo.com>
Date: Fri, 06 Jul 2001 06:18:16 -0700
Message-ID: <F001.00342A4C.20010706053544@fatcity.com>

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: Gene Gurevich
INET: g_u_r_e_v_i_c_h_at_yahoo.com

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