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Microsoft® SQL Server 2008 R2 Unleashed
book

Microsoft® SQL Server 2008 R2 Unleashed

by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
September 2010
Intermediate to advanced content levelIntermediate to advanced
1704 pages
111h 8m
English
Sams
Content preview from Microsoft® SQL Server 2008 R2 Unleashed

Clustered Indexes

Clustered indexes sort and store the data rows for a table, based on the columns defined in the index. For example, if you were to create a clustered index on the LastName and FirstName columns in a table, the data rows for that table would be organized or sorted according to these two columns. This has some obvious advantages for data retrieval. Queries that search for data based on the clustered index keys have a sequential path to the underlying data, which helps reduce I/O.

A clustered index is analogous to a filing cabinet where each drawer contains a set of file folders stored in alphabetical order, and each file folder stores the files in alphabetical order. Each file drawer contains a label that indicates which folders ...

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Publisher Resources

ISBN: 9780768696585Purchase book