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 InternalsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 8. The Query Optimizer
Conor Cunningham
The Query Optimizer in Microsoft SQL Server 2008 determines the query plan to be executed for a given SQL statement. Because the Query Optimizer does not have a lot of exposed features, it is not as widely understood as some of the other components in the SQL Server Engine. This chapter describes the Query Optimizer and how it works. After reading this chapter, you should understand the high-level optimizer architecture and should be able to reason about why a particular plan was selected by the Query Optimizer. By extension, you should be able to troubleshoot problem query plans in the case when the Query Optimizer may not select the desired query plan and how to affect that selection.
This chapter ...
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