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SQL Server Query Tuning and Optimization

You're reading from SQL Server Query Tuning and Optimization

Product type Book

Published in Aug 2022

Publisher Packt

ISBN-13 9781803242620

Pages 446 pages

Edition 1st Edition

Languages

Concepts

Author (1):

Benjamin Nevarez

Table of Contents (14) Chapters

Preface

Chapter 1: An Introduction to Query Tuning and Optimization

Chapter 2: Troubleshooting Queries

Chapter 3: The Query Optimizer

Chapter 4: The Execution Engine

Chapter 5: Working with Indexes

Chapter 6: Understanding Statistics

Chapter 7: In-Memory OLTP

Chapter 8: Understanding Plan Caching

Chapter 9: The Query Store

Chapter 10: Intelligent Query Processing

Chapter 11: An Introduction to Data Warehouses

Chapter 12: Understanding Query Hints

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Parallelism

SQL Server can use parallelism to help execute some expensive queries faster by using several processors simultaneously. However, even when a query might get better performance by using parallel plans, it could still use more resources than a similar serial plan.

For the query optimizer to consider parallel plans, the SQL Server installation must have access to at least two processors or cores or a hyper-threaded configuration. In addition, both the affinity mask and the maximum degree of parallelism advanced configuration options must allow the use of at least two processors, which they do by default. Finally, as explained later in this section, SQL Server will only consider parallelism for serial queries whose cost exceeds the configured cost threshold for parallelism, where the default value is 5.

The affinity mask configuration option specifies which processors are eligible to run SQL Server threads, and the default value of 0 means that all the processors can...

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Authors (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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