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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

Essential Denormalization Techniques

You can use various methods to denormalize a database table and achieve desired performance goals. Some of the useful techniques used for denormalization include the following:

• Keeping redundant data and summary data

• Using virtual columns

• Performing horizontal data partitioning

• Performing vertical data partitioning

Redundant Data

From an I/O standpoint, joins in a relational database are inherently expensive. To avoid common joins, you can add redundancy to a table by keeping exact copies of the data in multiple tables. The following example demonstrates this point. This example shows a three-table join to get the title of a book and the primary author’s name:

You could improve the performance of ...

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Publisher Resources

ISBN: 9780768696585Purchase book