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Learn T-SQL Querying
book

Learn T-SQL Querying

by Pedro Lopes, Pam Lahoud
May 2019
Intermediate to advanced content levelIntermediate to advanced
484 pages
11h 23m
English
Packt Publishing
Content preview from Learn T-SQL Querying

Query optimization essentials

The Query Processor is also the component inside the SQL Server Database Engine that is responsible for query optimization. This is the second stage of query processing and its goal is to produce a query plan that can then be cached for all subsequent uses of the same query. In this section, we will focus on the highlighted sections of the following diagram, which handle query optimization:

SQL Server uses cost-based optimization, which means that the Query Optimizer is driven mostly by estimations of the required cost to access and transform data (such as joins and aggregations) that will produce the intended ...

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Publisher Resources

ISBN: 9781789348811Supplemental Content