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Question related to missing index DMV's ?


Question related to missing index DMV's ?

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Shadab Shah
Shadab Shah
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This formula is given by microsoft to find out the index performance impact "user_seeks * avg_total_user_cost * ( avg_user_impact * 0.01 )".
But what is the unit to measure it. And if there is no unit to measure it then how can we say that index needs to be created. Like suppose if this column returns more then 100 then index needs to be created or if this value exceeds 1000 then this index needs to be created?
GilaMonster
GilaMonster
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It's not a unit and you cannot tell just from the missing index DMV that an index should or should not be created. It's just a place to start.


Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Shadab Shah
Shadab Shah
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Hmmm.......ok..........So you are telling me that this missing index dmv's are useless w00t.
WolfgangE
WolfgangE
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I would not call it useless. I personally like to have a look at the columns "user_seeks" and "last_user_seek". High numbers are an indicator that I should have a look at the queries that use this table, these queries might run slower than they could.
GilaMonster
GilaMonster
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Shadab Shah (9/2/2013)
So you are telling me that this missing index dmv's are useless w00t.


No. I didn't say they're useless. I said they're a place to start.


Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
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