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Channel: Answers for "Why does Sql Server recommends creating an index when it already exist?"
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Answer by Kev Riley

Haven't seen that before.Are the statistics up to date on that index?What is being used to execute the query, ie what does the execution plan say?

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Answer by Grant Fritchey

Are you sure you're running the query on the same server and database that you're pulling that index from? I've never seen a missing index suggestion on a table that had an index.

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Answer by TimothyAWiseman

I have never seen that exact scenario, but I have seen something fairly similar where it suggested an index on a column I already had indexed, but with included columns that I did not have in my index.

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Answer by Blackhawk-17

Just remember that SQL Server makes its suggestions for each individual case without looking at your dB as a whole. And totally in isolation from your application.If you blindly follow the...

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Answer by Rob Farley

That index is being suggested because it's massively better that the index that doesn't include the Data column (as a Lookup would be needed). In fact, without the included column, the index may be...

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Answer by John Kauffman

I have had this same problem, several times. sometimes the problem is in the execution plan, sometimes when querying missing index dmv's directly. For example, querying the missing index stats shows...

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Answer by Cyborg

This is limitation or a bug on Missing Index Feature [Missing Index Feature][1] [1]: http://sqlserver-deep-dives.blogspot.com/2010/09/missing-index-feature-limitation_28.html

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