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Performance question [message #411701]

Mon, 06 July 2009 06:39

prachij593
Messages: 266
Registered: May 2009

Senior Member

A query in PRODUCTION giving performance issue but the same sql is running quite well in test environment.
The databse is same in both the environment. But in test environment there are less data.Also, there is difference in Production vs Test environment in terms of memory, data etc..

So how to ensure that the sql I write will have no performance issues in Production env.

Many thanks...

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Re: Performance question [message #411704 is a reply to message #411701]

Mon, 06 July 2009 06:45

Michel Cadot
Messages: 68664
Registered: March 2007
Location: Nanterre, France, http://...

Senior Member
Account Moderator

Quote:

So how to ensure that the sql I write will have no performance issues in Production env.

If you know/get a recipe for this then you will be billionaire before long.

Regards
Michel

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Re: Performance question [message #411709 is a reply to message #411704]

Mon, 06 July 2009 06:57

Mohammad Taj
Messages: 2412
Registered: September 2006
Location: Dubai, UAE

Senior Member

Quote:

If you know/get a recipe for this then you will be billionaire before long.

Excellent !!! Smile

[Updated on: Mon, 06 July 2009 06:59]

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Re: Performance question [message #411745 is a reply to message #411709]

Mon, 06 July 2009 09:18

rleishman
Messages: 3728
Registered: October 2005
Location: Melbourne, Australia

Senior Member

There's two things in play here:

1. Your query may not scale. It may seem to work OK on small volumes but just doesn't cope with large volumes.

2. Oracle can CHANGE the way it executes a query depending on many system and data factors. This is usually for the better, but sometimes for the worse.

You need to find out whether you have crap SQL (1 above) or good SQL that Oracle is performing badly (2 above).

Run an explain plan on both environments - or better yet - a SQL Trace and TK*Prof - and compare them. Post them here if you are unsure.

Ross Leishman

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Re: Performance question [message #411818 is a reply to message #411745]

Tue, 07 July 2009 00:43

prachij593
Messages: 266
Registered: May 2009

Senior Member

I heard someone telling that we can bring production statistics on test environment...is it? dont know how! if its true is there any doc/link for that ?

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Re: Performance question [message #411823 is a reply to message #411818]

Tue, 07 July 2009 01:07

Michel Cadot
Messages: 68664
Registered: March 2007
Location: Nanterre, France, http://...

Senior Member
Account Moderator

And then? What do you expect exporting test statistics into production database but fooling the optimizer and getting the worst possible execution plan?

Regards
Michel

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