SQL Server Execution Plans - Red Gate Software

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Table of Contents Introduction ___________________________________________13 Changes in This Second Edition _________________________________________ 15 Code Examples _______________________________________________________16 Chapter 1: Execution Plan Basics _________________________18 What Happens When a Query is Submitted? _______________________________19 Query parsing _____________________________________________________ 19 Algebrizer ________________________________________________________ 20 The query optimizer ________________________________________________ 21 Query execution ___________________________________________________24 Estimated and Actual Execution Plans ____________________________________25 Execution Plan Reuse _________________________________________________ 26 Clearing Plans from the Plan Cache ______________________________________28 Execution Plan Formats _______________________________________________ 29 Graphical plans ____________________________________________________29 Text plans _________________________________________________________29 XML plans ________________________________________________________30 Getting Started _______________________________________________________ 31 Permissions required to view execution plans ____________________________ 31 Working with graphical execution plans ________________________________ 32 Working with text execution plans _____________________________________42 Working with XML execution plans ___________________________________ 46 Interpreting XML plans ______________________________________________47 Retrieving Plans from the Cache Using Dynamic Management Objects ________ 51 Automating Plan Capture Using SQL Server Trace Events ___________________ 53 Execution plan events _______________________________________________54 Capturing a Showplan XML trace ______________________________________56 Why the actual and estimated execution plans might differ _________________59 Summary ____________________________________________________________61
Chapter 2: Graphical Execution Plans for Basic Queries _____ 62 The Language of Graphical Execution Plans ______________________________ 62 Some Single Table Queries ______________________________________________65 Clustered Index Scan ________________________________________________65 Clustered Index Seek _______________________________________________ 68 NonClustered Index Seek ___________________________________________ 70 Key Lookup _______________________________________________________ 73 Table Scan ________________________________________________________79 RID Lookup ______________________________________________________ 80 Table Joins ___________________________________________________________83 Hash Match join __________________________________________________ 86 Nested Loops join _________________________________________________ 89 Compute Scalar ____________________________________________________92 Merge Join ________________________________________________________93 Filtering Data _______________________________________________________ 96 Execution Plans with GROUP BY and ORDER BY _________________________ 99 Sort _____________________________________________________________ 99 Hash Match (aggregate) _____________________________________________ 103 Filter ____________________________________________________________104 A brief aside on rebinds and rewinds __________________________________ 105 Execution Plans for INSERT, UPDATE and DELETE Statements _____________108 INSERT statements ________________________________________________109 UPDATE statements _______________________________________________ 112 DELETE statements _______________________________________________ 114 Summary ___________________________________________________________ 114 Chapter 3: Text and XML Execution Plans for Basic Queries __116 Text Execution Plans _________________________________________________ 117 A text plan for a simple query ________________________________________ 117 A text plan for a slightly more complex query ___________________________ 121 XML Execution Plans _________________________________________________126 An estimated XML plan _____________________________________________ 127 An actual XML plan ________________________________________________ 134
Page 1 and 2: SQL Handbooks SQL Server Execution
Page 3: First Edition 2008 Copyright Grant
Page 7 and 8: Table Hints _______________________
Page 9 and 10: About the Author Grant Fritchey is
Page 11 and 12: Foreword I have attended many SQL S
Page 13 and 14: Introduction Every day, out in the
Page 15 and 16: If you are specifically looking for
Page 17 and 18: Some of the code may not work withi
Page 19 and 20: Chapter 1: Execution Plan Basics Wh
Page 21 and 22: The query optimizer Chapter 1: Exec
Page 23 and 24: Chapter 1: Execution Plan Basics Te
Page 25 and 26: Chapter 1: Execution Plan Basics Es
Page 27 and 28: Chapter 1: Execution Plan Basics SQ
Page 29 and 30: Execution Plan Formats Chapter 1: E
Page 31 and 32: Getting Started Chapter 1: Executio
Page 33 and 34: Chapter 1: Execution Plan Basics I
Page 35 and 36: Chapter 1: Execution Plan Basics In
Page 37 and 38: Chapter 1: Execution Plan Basics ca
Page 39 and 40: Figure 1.5 Chapter 1: Execution Pla
Page 41 and 42: Chapter 1: Execution Plan Basics Al
Page 43 and 44: SET SHOWPLAN_ALL ON; Listing 1.5 Ch
Page 45 and 46: Chapter 1: Execution Plan Basics Wh
Page 47 and 48: Interpreting XML plans Chapter 1: E
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Chapter 1: Execution Plan Basics
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Chapter 1: Execution Plan Basics Th
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Chapter 1: Execution Plan Basics Wh
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Summary Chapter 1: Execution Plan B
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Chapter 2: Graphical Execution Plan
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Figure 2.9 Chapter 2: Graphical Exe
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Table Scan Chapter 2: Graphical Exe
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Figure 2.12 Chapter 2: Graphical Ex
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INSERT statements Chapter 2: Graphi
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Note Chapter 2: Graphical Execution
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Chapter 3: Text and XML Execution P
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Figure 3.10 Chapter 3: Text and XML
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GO Listing 4.1 Chapter 4: Understan
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Chapter 4: Understanding More Compl
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Figure 4.21 Chapter 4: Understandin
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Figure 4.24 Chapter 4: Understandin
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Chapter 5: Controlling Execution Pl
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Figure 5.3 Chapter 5: Controlling E
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Figure 5.8 Chapter 5: Controlling E
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Figure 5.10 Chapter 5: Controlling
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OPTION ( FAST 10 ); Listing 5.16 Fi
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Listing 5.17 Chapter 5: Controlling
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OPTION ( MAXDOP 1 ); Listing 5.20 C
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NOEXPAND Chapter 5: Controlling Exe
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INDEX() Chapter 5: Controlling Exec
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Chapter 6: Cursor Operations Most o
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Logical operators Chapter 6: Cursor
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Figure 6.4 Chapter 6: Cursor Operat
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Chapter 6: Cursor Operations After
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OPEN CurrencyList FETCH NEXT FROM C
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Physical operators Chapter 6: Curso
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Figure 6.14 Chapter 6: Cursor Opera
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Population Query Chapter 6: Cursor
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Figure 6.18 Keyset cursor Chapter 6
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Chapter 6: Cursor Operations The ma
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DECLARE CurrencyList CURSOR READ_ON
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END Chapter 6: Cursor Operations IF
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DECLARE ChangeData CURSOR STATIC Li
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Chapter 6: Cursor Operations indica
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Chapter 7: Special Datatypes and Ex
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FOR XML Chapter 7: Special Datatype
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Figure 7.3 Chapter 7: Special Datat
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Figure 7.6 Chapter 7: Special Datat
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Figure 7.10 Chapter 7: Special Data
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Using the .query method Chapter 7:
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Chapter 8: Advanced Topics In the p
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Chapter 8: Advanced Topics ON soh.S
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Chapter 8: Advanced Topics This typ
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Figure 8.2 Chapter 8: Advanced Topi
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Chapter 8: Advanced Topics This bec
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Chapter 8: Advanced Topics Cost thr
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Chapter 8: Advanced Topics Examinin
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Figure 8.6 Chapter 8: Advanced Topi
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Chapter 8: Advanced Topics The data
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Chapter 8: Advanced Topics Once you
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Chapter 8: Advanced Topics If you r
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Object plan guides Chapter 8: Advan
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Chapter 8: Advanced Topics From thi
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This returns two strings: Chapter 8
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Chapter 8: Advanced Topics Aside fr
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Figure 8.13 Chapter 8: Advanced Top
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Figure 8.15 Chapter 8: Advanced Top
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SQL Compare ® Pro Compare and sync
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SQL Server Execution Plans - Red Gate Software

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