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Expert Performance Indexing for SQL Server 2012 by Ted Krueger, Jason Strate

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CHAPTER 3

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Index Statistics

Now that you understand the logical and physical fundamentals of indexes, you should also look at the way in which statistics are stored for indexes. These statistics provide insight into how SQL Server can and is utilizing indexes. It also provides information needed to decipher why an index may not be selected and how it is behaving. This chapter will provide you with a deeper understanding about where and how this information is collected. You’ll investigate some additional DBCC statements and Dynamic Management Objects (DMO) that are available and demonstrate how that information comes to be.

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