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

Parameter sniffing

In this section, we will cover the cases in which reusing a plan can create performance problems. As you saw in Chapter 6, Understanding Statistics, SQL Server can use the histogram of statistics objects to estimate the cardinality of a query and then use this information to try and produce an optimal execution plan. The query optimizer accomplishes this by inspecting the values of the query parameters. This behavior is called parameter sniffing, and it is a very good thing: getting an execution plan tailored to the current parameters of a query improves the performance of your applications. This chapter has explained that the plan cache can store these execution plans so that they can be reused the next time the same query needs to be executed. This saves optimization time and CPU resources because the query does not need to be optimized again.

However, although the query optimizer and the plan cache work well together most of the time, some performance problems...

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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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Parameter sniffing

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