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

To estimate the cost of an execution plan, the query optimizer needs to know, as precisely as possible, the number of records returned by a given query, and to help with this cardinality estimation, SQL Server uses and maintains optimizer statistics. Statistics contain information describing the distribution of values in one or more columns of a table, and will be explained in greater detail in Chapter 6, Understanding Statistics.

As covered in Chapter 1, An Introduction to Query Tuning and Optimization, you can use the OptimizerStatsUsage plan property to identify the statistics used by the Query Optimizer to produce an execution plan. The OptimizerStatsUsage property is available only starting with SQL Server 2017 and SQL Server 2016 SP2. Alternatively, you can use the undocumented 9292 and 9204 trace flags to show similar information about the statistics loaded during the optimization process. Although this method works with all the supported and some older versions...

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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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