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You're reading from  SQL Server Query Tuning and Optimization

Product typeBook
Published inAug 2022
PublisherPackt
ISBN-139781803242620
Edition1st Edition
Concepts
Databases
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Author (1)
Benjamin Nevarez
Benjamin Nevarez
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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
Read more about Benjamin Nevarez

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Cardinality estimation feedback

As mentioned in Chapter 6, Understanding Statistics, the cardinality estimator estimates the number of rows to be processed by each operator in a query execution plan. Similar to the concept of memory grant feedback, and also based on the query store, cardinality estimation feedback is another intelligent query processing feature introduced with SQL Server 2022, which can learn and adjust based on the history of previous query executions. As we learned in Chapter 6, Understanding Statistics, the cardinality estimator uses different model assumptions to perform cardinality estimations. In addition, starting with SQL Server 2014, SQL Server has two different cardinality estimators to choose from.

The cardinality estimator feedback feature works by analyzing repeating queries. If an existing model assumption appears incorrect or produces a suboptimal query plan, the cardinality estimator will identify and use a model assumption that better fits a given...

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SQL Server Query Tuning and Optimization
Published in: Aug 2022Publisher: PacktISBN-13: 9781803242620
© 2022 Packt Publishing Limited All Rights Reserved

Author (1)

author image
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
Read more about Benjamin Nevarez

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