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Home -> Community -> Mailing Lists -> Oracle-L -> RE: A Tale of Two SQLs
Dan,
I agree that the work appears to be going into creating consistent reads. Is your SQL just a SELECT? Any DML (updates?). Any triggers? I'm thinking 'write consistency'. Tom Kyte gave a really good talk on this at IOUG. If you do a long running UPDATE and another session updates and commits a row you haven't reached, you rollback and start the update again. CR obviously increase even without much activity on the table. My tip today is to check out http://asktom.oracle.com/pls/ask/f?p=4950:8:16912210699952507311::NO::F4950_P8_D ISPLAYID,F4950_P8_CRITERIA:11504247549852, Henry
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Tim Gorman
Sent: Monday, May 03, 2004 4:38 PM
To: oracle-l_at_freelists.org
Subject: Re: A Tale of Two SQLs
Dan,
I think that you've hit upon the only possible explanation, especially regarding your comment that "eventually it will get a 1555 error". The flip-side of ORA-01555 is more work spent rebuilding a consistent read...
Hope that the support folks return the right answer... :-)
-Tim
on 5/3/04 2:05 PM, Daniel Fink at Daniel.Fink_at_Sun.COM wrote:
> It was the best of sql executions; it was the worst of sql
> executions.
>
> We have a process that periodically slows down. So far, we have
> not been able to pinpoint a root cause, but we continue to
> pester the development/application support folks for more info.
> I apologize for the limited information, but I'm hoping that we
> are aiming in the right direction.
>
> We are smart enough that we captured a 10046 trace during a good
> execution as a baseline. I have tagged the lines from this trace
> file as (good). This morning, the query began slowing down
> (eventually it will get a 1555 error). We turned on tracing and
> those lines are tagged as (bad).
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