Why it takes long time to execute on Production than staging?

Hi Experts,
Any help apreciated on below issue.
I have one anonymous block for updating around 1 million records by joining 9 tables.
This is proceeded to production by following environments. And all env have exact equal volume of data.
development->Testing->Staging->Production.
The funny problem is while it takes 5 mins to be executed in all environments, it takes 30 mins on production.
why it happned and what can be action points for future?
Thanks
-J
==============
If the performance is that different in the different environments, one or more statements must have different query plans in the different environments. The first step would be to get the query plans and compare them to figure out which statement(s) is/are running slowly.
If there are different query plans, that implies that something is different between the environments. That could be any of
- Oracle version
- initialization parameters
- data
- object statistics
- system statistics
If you guarantee that the data is the same, I would tend to expect that the object statistics are different. How have you gathered statistics in the various environments? Can you move statistics from an environment where performance is acceptable to the environment where performance is unacceptable?
I would also recommend following the advice others have given you. You don't want to commit in a loop and you want to do as much processing in SQL as possible.
Justin
===============
Thanks Steve for your inputs.
My investigation resulted following 2 points.
There are 2 main reasons why some scripts might take longer in live than on Staging.
1: Weekend backups were running on the live server so slowing the server down allot.
2: the tables are re-orged when they are imported into staging/Dev – so the table and index layout is optimal, on live the tables and indexes are not necessarily contiguous so in order to do the same work the server will need to do many more I/O operations.
Can we have some action points to address these above issues?
I think if data can be contigous then it may help.
Best Regards
-J
===============
But before that, can you raise this in a seperate thread as there is a different issue going on in this thread?
Cheers
Sarma.
===========
Posts: 4
Registered: 08/28/06
Re: Performance issue (Oracle 10.2.0.3.0)
Posted: May 22, 2009 2:46 AM in response to: Radhakrishna Sa... Edit Reply
Hey Sarma,
Exterme aplogies to say that I don't know how to raise a new thread.
Thanks in advnce for your help.
-J
user636482
Posts: 202
Registered: 05/15/08
Re: Performance issue (Oracle 10.2.0.3.0)
Posted: May 22, 2009 2:51 AM in response to: user527345 Reply
Hi User 527345,
Please follow the steps to raise a request in this Forum.
1. Register urself.
2. Go to the forum home and select the Technolgy where do you want to rasie a request.
eg : If is related to Oracle DATAbase general then select Oracle databse general...
3. clik on post new thread
4. Give the summary of your issue.
5. then submit the issue.
please let me know if you need more information.
Thank you

Jayashree Mohanty wrote:
My investigation resulted following 2 points.
There are 2 main reasons why some scripts might take longer in live than on Staging.
1: Weekend backups were running on the live server so slowing the server down allot.
2: the tables are re-orged when they are imported into staging/Dev – so the table and index layout is optimal, on live the tables and indexes are not necessarily contiguous so in order to do the same work the server will need to do many more I/O operations.
Can we have some action points to address these above issues?
I think if data can be contigous then it may help.First , I didn't get at all what actually was that thing when you copied some part of don't know which post in your actual question? Please read this , it would help you post a proper question to get a proper answer ,
http://www.catb.org/~esr/faqs/smart-questions.html
Now, how did you come to the conclusion that the backups are actually making your query slower? What's the benchmark that you lead to this? And what's the meaning of the 2nd point , can you please explain it ?
As others have also mentioned, please post the plan of the query at boththe staging and production, that only can tell that what's going on.
HTH
Aman....

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