You're reading from SQL Server Query Tuning and Optimization

Product typeBook

Published inAug 2022

PublisherPackt

ISBN-139781803242620

Edition1st Edition

Concepts

Databases

Author (1)

Benjamin Nevarez

Statistics on computed columns

Another interesting step that’s performed during query optimization is automatically matching computed columns. Although computed columns have been available in previous versions of SQL Server, the automatic matching feature was only introduced with SQL Server 2005. In this section, we will show you how this feature works and explain how computed columns can help improve the performance of your queries.

A problem that’s faced by some queries that use scalar expressions is that they usually cannot benefit from statistics, and without statistics, the Query Optimizer will use the 30% selectivity guess on inequality comparisons, which may produce inefficient execution plans. A solution to this problem is using computed columns since SQL Server can automatically create and update statistics on these columns. A great benefit of this solution is that you do not need to specify the name of the computed column in your queries for SQL Server to...

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SQL Server Query Tuning and Optimization

Published in: Aug 2022Publisher: PacktISBN-13: 9781803242620

Author (1)

Benjamin Nevarez

Benjamin Nevarez is a database professional based in Los Angeles, California who specializes in SQL Server query tuning and optimization. He is the author of several books including “High Performance SQL Server'', “SQL Server 2017 on Linux”, “SQL Server 2014 Query Tuning & Optimization” and “Inside the SQL Server Query Optimizer” and has also co-authored other books such as “SQL Server 2012 Internals”. Benjamin has also been a speaker at many SQL Server conferences around the world
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Statistics on computed columns

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