Query plans

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DMVs for Query Plan Metadata

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Before you can tackle any performance issues with a working database, you need to know which queries to work on first: The ones that are taking the most time in total, and which are the most expensive in terms of cache, CPU and disk. Although SQL Server Management Studio can help, it isn't long before you need an armoury of DMVs to provide you the statistics to find the culprits.

2010-09-02

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Question of the Day

BIT_COUNT() III

In SQL Server 2025, I run this code:

select bit_count(-1)
What is returned?

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