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SQL Server 2008
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SQL Server 2008 Administration
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SQL Tuninig recommendation page
SQL Tuninig recommendation page
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zi
zi
Posted Sunday, February 17, 2013 2:41 AM
SSC Journeyman
Group: General Forum Members
Last Login: Friday, April 26, 2013 11:23 AM
Points: 76,
Visits: 188
Dear Experts
How to read the recommendation page in sql tuning,
I mean what should I do
ex : the attached picture
Thanks lot
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Post #1420952
GilaMonster
GilaMonster
Posted Sunday, February 17, 2013 3:30 AM
SSC-Dedicated
Group: General Forum Members
Last Login: Today @ 4:15 PM
Points: 37,651,
Visits: 29,903
Test the indexes out, one by one. If they help performance keep them. If they don't, drop the index and ignore the recommendation.
Never run DTA on a production server.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #1420956
zi
zi
Posted Sunday, February 17, 2013 4:06 AM
SSC Journeyman
Group: General Forum Members
Last Login: Friday, April 26, 2013 11:23 AM
Points: 76,
Visits: 188
Thanks for replying
what do you mean by test out index and how?
How to know that this index inhance performance or not
why never run Database Tuning Advisor on a production server
Thanks lot
Post #1420957
GilaMonster
GilaMonster
Posted Sunday, February 17, 2013 4:24 AM
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Group: General Forum Members
Last Login: Today @ 4:15 PM
Points: 37,651,
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Create the index, run your benchmark (the one you set up starting any tuning work), see if there's an improvement in performance.
As for why not on a production server, load, impact, side effects. Production servers are for production usage, for users. Not for dev and testing, that's what dev and testing servers are for.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #1420960
zi
zi
Posted Sunday, February 17, 2013 5:04 AM
SSC Journeyman
Group: General Forum Members
Last Login: Friday, April 26, 2013 11:23 AM
Points: 76,
Visits: 188
Still dont understand how to measure performance after creatiing index
and if the index is already exist, should I drop it to see the difference
Thanks
Post #1420963
GilaMonster
GilaMonster
Posted Sunday, February 17, 2013 9:08 AM
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Group: General Forum Members
Last Login: Today @ 4:15 PM
Points: 37,651,
Visits: 29,903
Measure query performance before you create the index. Record the stats (and you should have some idea what queries you're tuning)
Add the index
Measure query performance again.
Compare.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #1420988
zi
zi
Posted Sunday, February 17, 2013 12:47 PM
SSC Journeyman
Group: General Forum Members
Last Login: Friday, April 26, 2013 11:23 AM
Points: 76,
Visits: 188
Do you mean to see how much time the query has spent befor and after the index
Thanks
Post #1421002
GilaMonster
GilaMonster
Posted Sunday, February 17, 2013 2:25 PM
SSC-Dedicated
Group: General Forum Members
Last Login: Today @ 4:15 PM
Points: 37,651,
Visits: 29,903
Not just time, all performance characteristics. You need to have a baseline before you start tuning, or how do you know whether your work has been effective or not?
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #1421006
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