Re: Slow UPDATE

From: Terry Sutton <terrysutton_at_usa.net>
Date: Sun, 16 May 2004 19:29:03 -0700
Message-ID: <052101c43bb7$0400c5f0$0400a8c0@TerrySutton>

Look at the trace itself (not the tkprof), see what the query is actually doing. If the query is using the index, you'll see "db file sequential reads" of the index and table. If it's doing table scans you'll see "db file scattered reads".

--Terry

Original Message ----- You're saying that a 10046 trace isn't always reliable with respect to identifying the 'real' execution plan?

-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of jaromir nemec
Sent: Sunday, May 16, 2004 10:26 AM
To: oracle-l_at_freelists.org
Subject: Re: Slow UPDATE

Hi Thomas,

Original Message ----- From: "Thomas Jeff" <jeff.thomas_at_thomson.net> To: <oracle-l_at_freelists.org> Sent: Friday, May 14, 2004 3:18 PM Subject: Slow UPDATE

if the table 'OD_CUST_LOCS' has approximately 9682 blocks (=1936484/200) I'm pretty sure that the update is doing full scan on it.

If you are on 9i check the "real" execution plan in V$SQL_PLAN.

>call count cpu elapsed disk query current rows
> Execute 200 578.44 789.45 1852160 1936484 218
200

An "elegant" explanation will be that the Informatica ports have different types than the PK columns. Check the type of the ports 66-68

> WHERE SRC_EFF_FROM_DT = :66 AND KEY_ID = :67 AND SOURCE_ID = :68
regards

Jaromir D.B. Nemec
http://www.db-nemec.com

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Received on Sun May 16 2004 - 21:28:20 CDT