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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Anywy to accurately predict time for long running queries?
Ryan,
A couple of things to think about....
Count the LIOs and PIOs that a job requires. This will probably be some function of the number of rows the job processes. Compute the average LIO and PIO latencies for your system. Use the rough response time estimate R = est_LIO_count * avg_LIO_latency + est_PIO_count * avg_PIO_latency.
If you're *writing* the app yourself, then consider using the Oracle long-ops stuff. I can't remember how to access it (and my network connection is too slow to look it up right now). For example, if you have a PL/SQL loop that goes through something N times, then you update the progress meter every so often (say on iterations N/10, 2N/10, 3N/10, ...) so your user will know approximately how far along the program has gotten.
Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
* Nullius in verba *
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-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of ryan.gaffuri_at_cox.net
Sent: Tuesday, February 10, 2004 7:10 AM
To: oracle-l_at_freelists.org
Subject: Anywy to accurately predict time for long running queries?
People here want me to accurately predict how long it will take long running SQL to execute. I'm reading carrie milsap's book now, and I believe he has some methods that give good estimates on overall performance(I have not gotten to that part yet).
any known methods to accurately predict sql? BTW, I dont have specs on the hardware, its a customer site... and yes I know you really need that.
I dont think this is doable, but im wondering if anyone has put together any papers on the subject.
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