© Dmitri Korotkevitch 2016

Dmitri Korotkevitch, Pro SQL Server Internals, 10.1007/978-1-4842-1964-5_2

2. Tables and Indexes: Internal Structure and Access Methods

Dmitri Korotkevitch

(1)Tampa, Florida, USA

SQL Server stores data in tables and indexes. They represent a collection of data pages with rows that belong to a single entity or object.

By default, the data in tables is unsorted. You can store it in sorted order by defining a clustered index on the table. Moreover, you can create nonclustered indexes that persist another copy of the data from the index columns sorted in a different order.

In this chapter, we will talk about the internal structure of the indexes, cover how SQL Server uses them, and discuss how to write queries in a way that ...

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