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RE: Urgent: performance problems with 8i to 9i

From: Stephane Faroult <sfaroult_at_oriolecorp.com>
Date: Thu, 22 May 2003 07:07:12 -0800
Message-ID: <F001.0059FE01.20030522070712@fatcity.com>


>----- ------- Original Message ------- -----
>From: =?iso-8859-1?q?Joshua=20Becker?=
><jbecker_sweden_at_yahoo.se>
>To: Multiple recipients of list ORACLE-L
><ORACLE-L_at_fatcity.com>
>Sent: Thu, 22 May 2003 03:56:45
>
>Hi all,
>
>we have following environment remote db v 8.1.7 on
>Sun Solaris E10K. From that db is running a program
>which does updates through database link.
>
>Remote database is version 9.2.0.1.
>
>When remote database version was 8.1.7 to complete
>that run took only 11hours but after upgrading to
>9i it will took more than double.
>
>How you find this kind of problems, what might be
>the reason, all other "moving parts" are the same
>only thing we have changed is the database version
>on remote side...
>
>TIA
>Joshua
>
>G堦i kch f>in sajt v䲤erad p堮olltid
>med Yahoo! Express

"Only 11 hours". Waow. IMHO when your processes take that amount of time, there is an inherent problem already. What about having snapshots on the target database and running the process there? The execution plan must be interesting. Anyway, you are in this dangerous zone where a minute change to the behaviour of the CBO can put all of the playing-cards castle down. Search google for 'catastrophe theory'. And seriously consider snapshots.

Regards,

Stephane Faroult
Oriole

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Stephane Faroult
  INET: sfaroult_at_oriolecorp.com

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Received on Thu May 22 2003 - 10:07:12 CDT

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