November 2012
Intermediate to advanced
576 pages
17h 2m
English
book
Professional SQL Server 2012 Internals and Troubleshooting
by Christian Bolton, James Rowland-Jones, Glenn Berry, Justin Langford, Gavin Payne, Amit Banerjee
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Chapter 5
Query Processing and Execution
WHAT’S IN THIS CHAPTER?
- How SQL Server processes queries
- Understanding query optimization
- Reading query plans
- Using options to affect query plans
- Using plan hints to affect query plans
WROX.COM CODE DOWNLOADS FOR THIS CHAPTER
The wrox.com code downloads for this chapter are found at www.wrox.com/remtitle.cgi?isbn=1118177657 on the Download Code tab. The code is in the Chapter 5 download and individually named according to the names throughout the chapter.
This section uses the AdventureWorks 2012 database, so now is a good time to download it from the SQL Server section on CodePlex if you haven’t already. The AdventureWorks 2012 samples can be found at http://www.codeplex.com/SqlServerSamples.
INTRODUCTION
Query processing is one of the most critical activities that SQL Server performs in order to return data from your T-SQL queries. Understanding how SQL Server processes queries, including how they are optimized and executed, is essential to understanding what SQL Server is doing and why it chooses a particular way to do it.
In this chapter you will learn how SQL Server query processing works, including the details of query optimization and the various options that you can use to influence the optimization process; and how SQL Server schedules activities and executes them.
QUERY PROCESSING
Query processing is performed by the Relational Engine in SQL Server. It is the process of taking the T-SQL statements you write and converting them ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.