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Expert Performance Indexing in SQL Server, Second Edition by Grant Fritchey, Jason Strate

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CHAPTER 4

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XML Indexes

The past couple chapters focused on indexing what is commonly referred to as structured data, where there is a common schema and organization around the data and its storage. In this chapter, the indexing focus shifts to unstructured and semistructured data. With both structured and unstructured data, the task of indexing is to gain optimal efficiency for retrieving and manipulating data, but the data types that represent these types of data have differences in how they are stored in the database. These differences dictate how and why indexing is implemented as well as how the indexes are used by the query optimizer. SQL ...

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