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SQL Server 2008 Query
Performance Tuning
Distilled
Grant Fritchey and Sajal Dam
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SQL Server 2008 Query Performance Tuning Distilled
Copyright © 2009 by Grant Fritchey and Sajal Dam
All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means,
electronic or mechanical, including photocopying, recording, or by any information storage or retrieval
system, without the prior written permission of the copyright owner and the publisher.
ISBN-13 (pbk): 978-1-4302-1902-6
ISBN-13 (electronic): 978-1-4302-1903-3
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Lead Editor: Jonathan Gennick
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Contents at a Glance
About the Author .................................................................xix
About the Technical Reviewer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi
Acknowledgments ...............................................................xxiii
Introduction .................................................................... xxv
CHAPTER 1 SQL Query Performance Tuning ..................................1
CHAPTER 2 System Performance Analysis ..................................17
CHAPTER 3 SQL Query Performance Analysis ...............................61
CHAPTER 4 Index Analysis ................................................101
CHAPTER 5 Database Engine Tuning Advisor ...............................151
CHAPTER 6 Bookmark Lookup Analysis ....................................163
CHAPTER 7 Statistics Analysis .............................................175
CHAPTER 8 Fragmentation Analysis .......................................209
CHAPTER 9 Execution Plan Cache Analysis .................................241
CHAPTER 10 Stored Procedure Recompilation ...............................283
CHAPTER 11 Query Design Analysis .........................................313
CHAPTER 12 Blocking Analysis .............................................351
CHAPTER 13 Deadlock Analysis .............................................401
CHAPTER 14 Cursor Cost Analysis ..........................................415
CHAPTER 15 Database Workload Optimization ...............................439
CHAPTER 16 SQL Server Optimization Checklist .............................475
INDEX .......................................................................497
iii
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Contents
About the Author .................................................................xix
About the Technical Reviewer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi
Acknowledgments ...............................................................xxiii
Introduction .................................................................... xxv
CHAPTER 1 SQL Query Performance Tuning .............................1
The Performance-Tuning Process ..................................2
The Core Process ............................................2
Iterating the Process .........................................4
Performance vs. Price .............................................7
Performance Targets .........................................7
“Good Enough” Tuning .......................................7
Performance Baseline .............................................8
Where to Focus Efforts ............................................9
SQL Server Performance Killers ...................................10
Poor Indexing ..............................................11
Inaccurate Statistics ........................................11
Excessive Blocking and Deadlocks ............................11
Non-Set-Based Operations ...................................12
Poor Query Design ..........................................12
Poor Database Design .......................................12
Excessive Fragmentation ....................................13
Nonreusable Execution Plans .................................13
Poor Execution Plans ........................................13
Frequent Recompilation of Execution Plans ....................14
Improper Use of Cursors .....................................14
Improper Configuration of the Database Log ...................14
Excessive Use or Improper Configuration of tempdb .............14
Summary .......................................................15
v
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