Missing index statistics

SQLServerCentral is supported by Red Gate Software Ltd.

Popular Topics

Home

Members

Calendar

Who's On

Home » SQL Server 2008 » SQL Server 2008 Administration » Missing index statistics - Dementia ?

Missing index statistics - Dementia ?

Rate Topic

Display Mode

Topic Options

Author

Message

SQL Pizza

Posted Monday, March 11, 2013 9:58 AM

SSC-Enthusiastic

Group: General Forum Members
Last Login: Tuesday, May 14, 2013 5:14 AM
Points: 116, Visits: 293

I use a script showing me the missing index statistics with impact and so on. I think you all know it. But sometimes I add an index which is costly, cleanup the statistics. And he shows me the index again? Why this? IS this a bug? Can somebody explain me this? Getting into details would be nice ;).

PS: I know the impact is not a good indicator, but what is the reason for this behaviour?

Greetz
SQL Pizza

sometimes you dont see the pizza for the toppings...
seek and ya shall find...

Post #1429363

SQLRNNR

Posted Monday, March 11, 2013 10:37 AM

SSCoach

Group: General Forum Members
Last Login: Monday, May 20, 2013 1:07 PM
Points: 18,733, Visits: 12,332

Sometimes you may continue to see that index because the query that needs it has columns using a different sort order than the index. And sometimes it is a bug.

First check the sort for the columns and see if that is impacting the index use.

Jason AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008

SQL RNNR

Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp

Post #1429393

opc.three

Posted Tuesday, March 12, 2013 5:31 AM

SSCertifiable

Group: General Forum Members
Last Login: Today @ 12:39 PM
Points: 6,722, Visits: 11,765

The bug.

__________________________________________________________________________________________________
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 #1429695

« Prev Topic | Next Topic »

Permissions