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SQL Server 2005
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SQL Server 2005 Performance Tuning
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Execution plan
Execution plan
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Oracle_91
Oracle_91
Posted Monday, September 10, 2012 4:09 PM
Say Hey Kid
Group: General Forum Members
Last Login: Friday, May 17, 2013 4:46 PM
Points: 675,
Visits: 1,559
Hi All,
I have 2 sql sevr 2005 instances with same build no,same edition.
I restored the database from one insatnce to another instance. But when i execute the same query in the second instance , it poduces are different plan and my query performance is slow now on one instance.
Just wanted to understand how sql server or on what factors/basis sql servr produces are different plans if my stats are same ?
Thanks in Advance.
Post #1357043
Lynn Pettis
Lynn Pettis
Posted Monday, September 10, 2012 4:14 PM
SSC-Insane
Group: General Forum Members
Last Login: Today @ 10:18 AM
Points: 21,620,
Visits: 27,454
Oracle_91 (9/10/2012)
Hi All,
I have 2 sql sevr 2005 instances with same build no,same edition.
I restored the database from one insatnce to another instance. But when i execute the same query in the second instance , it poduces are different plan and my query performance is slow now on one instance.
Just wanted to understand how sql server or on what factors/basis sql servr produces are different plans if my stats are same ?
Thanks in Advance.
Are there any differences in how the instances are configured? Are the instances on the same server or different servers? If different servers, how are these servers configured?
Lynn Pettis
For better assistance in answering your questions, click here
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For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here
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(My Mirror Blog)
Post #1357047
Oracle_91
Oracle_91
Posted Monday, September 10, 2012 10:02 PM
Say Hey Kid
Group: General Forum Members
Last Login: Friday, May 17, 2013 4:46 PM
Points: 675,
Visits: 1,559
Both are two different server with configuration. But on the second servers there are 2 instances.
One more thing, the second is not at all running on the second box.
Post #1357124
Jason Selburg
Jason Selburg
Posted Wednesday, September 12, 2012 6:34 AM
SSCrazy
Group: General Forum Members
Last Login: Wednesday, May 15, 2013 7:55 AM
Points: 2,582,
Visits: 3,552
Did you rebuild statistics?
I do believe that even though the servers may be configured the same/same hardware, when you restore a database the stats get "out of whack".
I may be wrong, and if I am someone will most likely point it out here
.
______________________________________________________________________
Personal Motto: Why push the envelope when you can just open it?
If you follow the direction given
HERE
you'll likely increase the number and quality of responses you get to your question.
Jason L. Selburg
Post #1357939
opc.three
opc.three
Posted Wednesday, September 19, 2012 3:19 PM
SSCertifiable
Group: General Forum Members
Last Login: Today @ 10:56 AM
Points: 6,722,
Visits: 11,763
Jason Selburg (9/12/2012)
Did you rebuild statistics?
I do believe that even though the servers may be configured the same/same hardware, when you restore a database the stats get "out of whack".
I may be wrong, and if I am someone will most likely point it out here
.
A restore will not affect the statistics. A restore gives us an exact page-for-page database as existed when the database was backed up.
__________________________________________________________________________________________________
There are no special teachers of virtue, because virtue is taught by the whole community.
--Plato
Believe you can and you're halfway there.
--Theodore Roosevelt
Everything Should Be Made as Simple as Possible, But Not Simpler
--Albert Einstein
The significant problems we face cannot be solved at the same level of thinking we were at when we created them.
--Albert Einstein
1 apple is not exactly 1/8 of 8 apples. Because there are no absolutely identical apples.
--Giordy
Post #1361651
opc.three
opc.three
Posted Wednesday, September 19, 2012 3:20 PM
SSCertifiable
Group: General Forum Members
Last Login: Today @ 10:56 AM
Points: 6,722,
Visits: 11,763
Oracle_91 (9/10/2012)
Hi All,
I have 2 sql sevr 2005 instances with same build no,same edition.
I restored the database from one insatnce to another instance. But when i execute the same query in the second instance , it poduces are different plan and my query performance is slow now on one instance.
Just wanted to understand how sql server or on what factors/basis sql servr produces are different plans if my stats are same ?
Thanks in Advance.
If the optimizer chooses a parallel plan that could account for a difference. Can you please post both execution plans attached to this thread as .sqlplan files?
__________________________________________________________________________________________________
There are no special teachers of virtue, because virtue is taught by the whole community.
--Plato
Believe you can and you're halfway there.
--Theodore Roosevelt
Everything Should Be Made as Simple as Possible, But Not Simpler
--Albert Einstein
The significant problems we face cannot be solved at the same level of thinking we were at when we created them.
--Albert Einstein
1 apple is not exactly 1/8 of 8 apples. Because there are no absolutely identical apples.
--Giordy
Post #1361653
Bhuvnesh
Bhuvnesh
Posted Thursday, October 11, 2012 1:46 AM
SSCrazy
Group: General Forum Members
Last Login: Tuesday, March 26, 2013 8:41 AM
Points: 2,562,
Visits: 3,451
there could be some hardware allocation differnce like memory or cpu OR sme diiferent setting like maxdop etc
-------Bhuvnesh----------
While 1 = 1 (Learning SQL....)
Click to get fast response of your post
Post #1371251
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