March 2009
Intermediate to advanced
784 pages
30h 30m
English
book
Microsoft® SQL Server® 2008 Internals
by Paul Randal Kalen Delaney Kimberly Tripp, and Conor Cunningham
Content preview from Microsoft® SQL Server® 2008 Internals
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Optimizer Architecture
The Query Optimizer contains many optimization phases that each performs different functions. The different phases help the Query Optimizer perform the highest-value operations earliest in the optimization process.
The major phases in the optimization of a query, as shown in Figure 8-14, are as follows:
Simplification
Trivial plan
Auto-stats create/update
Exploration/implementation (phases)
Convert to executable plan
Figure 8-14. Query Optimizer pipeline
Before Optimization
The SQL Server query processor performs several steps before the actual optimization process begins. These transformations help shape the tree into a form about ...
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