RE: Oracle 11G Upgrade

From: TJ Kiernan <>
Date: Thu, 27 Mar 2014 15:05:24 +0000
Message-ID: <>

Not to distract from the other solutions, but I had a similar situation upgrading from 10.2 to 11.2 on 32bit Windows. Everything slowed down, and the most content users in the company started complaining. To my (and the sys admin's) surprise, the server only had 2GB of RAM. When we bumped it up to 4GB and set the 3GB switch, the complaints (at least about performance on that system) stopped immediately.

T. J.

From: [] On Behalf Of Jack van Zanen Sent: Wednesday, March 26, 2014 5:13 PM
Subject: Oracle 11G Upgrade

Hi All,

We have a database where we are upgraded to 11G from 9i. We have gone through the cycle of upgrading test first and doing testing before upgrading production and everything appeared fine.

Generally speaking the business is happy with performance except for one process that has slowed down quite badly.

We are on windows 32 bit oracle

The process that slowed down is below procedure which gets executed a lot of times.

We have no access to the source to change this so changing to merge is not an option.

Files are loaded that have a lot of history in it so the exception handler kicks in more often than not. When we do an initial load it is fast (just insert), but when the exception kicks in because of the duplicate value the performance goes south.

If I check the explain plan it uses the index to find the record to update so I do not see how to make that any faster. I am now thinking that it may be a difference in the way oracle 9i and 11G handle the exception that is causing it to take more time than it should.

I should say when we run 30 processes at the same time it comes to a grinding halt and when we run 4-5 at least it finishes.

 PROCEDURE DBO.insert_in_r( id_mp IN NUMBER,

                        id_rt IN NUMBER, ts IN DATE, r_val IN FLOAT, stat IN NUMBER )
            INSERT INTO DBO.results VALUES ( id_mp, id_rt, ts, r_val, stat );
            UPDATE dbo.Results
            SET ResultValue = r_val, Status = stat
                        ID_MeasurementPlace = id_mp         AND
                        ID_ResultType = id_rt                       AND
                        ResultTimeStamp = ts;
END insert_in_r;

Anybody have any idea where to look for a solution?

Jack van Zanen

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Received on Thu Mar 27 2014 - 16:05:24 CET

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