RE: SQL Update Performance

Same issue

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Wilt,
Charles
Sent: Thursday, February 07, 2008 3:03 PM
To: Midrange Systems Technical Discussion
Subject: RE: SQL Update Performance

Mark,

How about

UPDATE ADDRINP ad1
SET ad1.Addr1 = 'this is a test'
WHERE ad1.akey in (select ctradr
from contrcp
where cinact = 'CC01'
)


Charles Wilt
Software Engineer
CINTAS Corporation - IT 92B
513.701.1307

wiltc@xxxxxxxxxx

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
bounces@xxxxxxxxxxxx] On Behalf Of Murphy, Mark
Sent: Thursday, February 07, 2008 2:57 PM
To: midrange-l@xxxxxxxxxxxx
Subject: SQL Update Performance

I have an update that I am trying to do on V5R2:



UPDATE ADDRINP ad1

SET ad1.Addr1 = 'this is a test'

WHERE exists(

select * from contrcp ctr where

ctr.cinact = 'CC01' and

ctr.ctradr = ad1.akey)



This statement takes forever to run because of the join order the
optimizer is choosing. ADDRINP is
in Join position 1 and CONTRCP is in join position 2. This is most likely
because I am updating
ADDRINP. Only problem is that there are 3,000,000 records in ADDRINP, and
putting it in join position
1 forces the whole file to be read in order to pick out 6 records to be
processed. Can anyone think
of a way to force CONTRCP to join position 1?



Mark Murphy

Star Base Consulting, Inc.

e: murphym@xxxxxxxxxx




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