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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

Indexed Views and Performance

Adding indexes to tables is a generally accepted means for improving database performance. Indexes provide a keyed lookup to rows of data that can improve database access and avoid the performance nightmare of a table scan where the entire contents of a table are searched. The same basic principles apply to indexes on views, but indexed views are best utilized to increase performance in the following scenarios:

• Aggregations such as SUM or AVG can be precomputed and stored in the index to minimize the potentially expensive computations during query execution.

• Large table joins can be persisted to eliminate the need to write a join when retrieving the data.

• A combination of aggregations and large table joins ...

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Publisher Resources

ISBN: 9780768696585Purchase book