May 2019
Intermediate to advanced
484 pages
11h 23m
English
Content preview from Learn T-SQL Querying
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Query compilation essentials
The Query Processor is the component inside the SQL Server Database Engine that is responsible for compiling a query. In this section, we will focus on the highlighted sections of the following diagram, which handle query compilation:
The first stage of query processing is generally known as query compilation and includes a series of tasks that will eventually lead to the creation of a query plan. When an incoming T-SQL statement is parsed to perform syntax validations and ensure that it is correct T-SQL, a query hash value representing that statement as it was written is generated. If that query hash is already ...
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