Using Statistics For Index Design

Kendra Little argues that you should not use automatically created statistics as a guide for index creation:

We’ve talked a lot so far about how much statistics and indexes are related. This is why it seems like statistics might be useful for designing indexes!

But here’s the thing — SQL Server doesn’t track and report on how many times a statistic was used during optimization.

This is an interesting discussion.

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Dan Guzman shows that you can update statistics on system tables: The solution in many cases to simply update statistics on the underlying system tables indexes used by the problem DMV queries. This can be done selectively by identifying the system table indexes referenced in execution plan seek and scan operators of the problem query […]

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How Non-Clustered Index Key Columns Are Stored

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