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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 execution essentials

Query execution is driven by the relational engine in SQL Server. This means executing the plan that resulted from the optimization process. In this section, we will focus on the highlighted sections of the following diagram, which handle query execution:

Before execution starts, the relational engine needs to initialize the estimated amount of memory necessary to run the query, known as a memory grant. Along with the actual execution, the relational engine schedules the worker threads (also known as threads, or workers) for the processes to run on and provides inter-thread communication. The number of worker threads ...

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Publisher Resources

ISBN: 9781789348811Supplemental Content