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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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Breaking down complex queries

As we saw in Chapter 3, The Query Optimizer, in some cases, the SQL Server query optimizer may not be able to produce a good plan for a query with a large number of joins. The same is true for complex queries with both joins and aggregations. However, because it is rarely necessary to request all the data in a single query, a good solution for those cases could be to just break down a large and complex query into two or more simpler queries while storing the intermediate results in temporary tables. Breaking down complex queries this way offers several advantages:

  • Better plans: Query performance is improved because the query optimizer can create efficient plans for simpler queries.
  • Better statistics: Because one of the problems of some complex plans is being able to degrade intermediate statistics, breaking down these queries and storing the aggregated or intermediate results in temporary tables allows SQL Server to create new statistics, greatly...
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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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