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 New to SQL Server Administration
 Auto Update Statistics Option
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ahmeds08
Aged Yak Warrior

India
693 Posts

Posted - 10/08/2012 :  06:39:45  Show Profile  Send ahmeds08 a Yahoo! Message  Reply with Quote
Dear Experts,
Setting the Auto update Statistics option to 'True' is it profitable.
Or running it manually based on the requirement is good?

Thanks.

robvolk
Most Valuable Yak

USA
15688 Posts

Posted - 10/08/2012 :  07:18:31  Show Profile  Visit robvolk's Homepage  Reply with Quote
The only cases I know of where it's better to turn it off are very large tables that are frequently changed and need to sustain maximum performance. In those instances the performance hit of an auto stats update is enough to be detrimental.

It rarely hurts to have a scheduled manual statistics update. I recommend Ola Hallengren's maintenance script: http://ola.hallengren.com/sql-server-index-and-statistics-maintenance.html . It has numerous settings to control which stats are updated or not, as well as index maintenance.
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ahmeds08
Aged Yak Warrior

India
693 Posts

Posted - 10/08/2012 :  07:43:02  Show Profile  Send ahmeds08 a Yahoo! Message  Reply with Quote
Thanks Rob,mine is a data warehouse system,so setting it TRUE will be good?
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robvolk
Most Valuable Yak

USA
15688 Posts

Posted - 10/08/2012 :  09:46:34  Show Profile  Visit robvolk's Homepage  Reply with Quote
I'd leave it on. You can trace auto stats events and log them for future reference, if you see performance issues that occur during those times you can look at disabling it.
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NeilG
Aged Yak Warrior

United Kingdom
530 Posts

Posted - 10/12/2012 :  03:52:42  Show Profile  Reply with Quote
Definitely leave it on
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