Oracle-L: Re: Slow running jobs

From: <Jared.Still_at_radisys.com>
Date: Tue, 11 Mar 2003 11:53:50 -0800
Message-ID: <F001.00566A9C.20030311115350@fatcity.com>

Russ,

20 seconds isn't enough time to see much of what's going on.

Give the slow SQL a chance to execute and collect some waits.

I just finished doing this on an app this morning, collected 100meg of trace files. As long as you're doing it, set it to level 12, so you can seen bind vars if need be.

You can use 'alter system set max_dump_file_size=unlimited' for the duration of the collection period, then set it back to whatever it should be.

Run tkprof on all the trace files, then look for the big time wasters.

Jared

"Brooks, Russ" <Russ.Brooks_at_dayzim.com>
Sent by: root_at_fatcity.com
03/11/2003 08:34 AM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        Slow running jobs

Hi,
We're having slow response on some batch jobs in our production system. A straight SQL trace shows intermittant slow response times on selects against a variety of tables. What is odd is: 1. the statistics are current for the tables, frequently the results of a compute.
2. The same cursor with different bind variables will randomly vary from 200 microseconds to 3.6 seconds, randomly.
3. This occurs on multiple tables in multiple tablespaces. What is this normally indicative of?

The other thing I did was run a 10046 level 8 trace for about 20 seconds. I saw 22 log file sync's in that period in the trace file.

Any thoughts welcome.

Russ

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INET: Jared.Still_at_radisys.com

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