May 2019
Intermediate to advanced
484 pages
11h 23m
English
Content preview from Learn T-SQL Querying
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Understanding the query optimization workflow
Now it's time to take a deeper look at how SQL Server creates optimized query execution plans. As mentioned in Chapter 2, Understanding Query Processing, this is the second phase of query processing, and for the most part only Data Manipulation Language (DML) statements undergo query optimization. The query optimization process is defined by the following cumulative stages:
- Trivial Plan
- Exploration which in turn, includes three phases in itself:
- Transaction processing
- Quick plan
- Full optimization
In the Exploration stage, what differentiates between the several phases is the increasing sets of rules applicable to each one as the search for a good-enough query plan progresses. Users can ...
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