Beginning Oracle Database 11g Administration From Novice to Professional

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382 CHAPTER 17 SQL TUNING Identifying Inefficient SQL Statements When an application is performing poorly or a batch job takes a long time, we have to identify SQL statements that are consuming a lot of resources and are candidates for tuning. The simplest way to do this is to watch the operation of the database by using a GUI tool such as Enterprise Manager or SQL Developer. In Figure 17-1, you can see a query being run by . Figure 17-1. Using SQL Developer to monitor sessions A systematic way of identifying tuning candidates in a batch job is to trace the job. If you ask Oracle to trace a job, it records SQL statements and execution details in a trace file. The simplest way to start tracing a session is to use Enterprise Manager or SQL Developer as in Figure 17-1. You can also use the command as in the following example: You can then use the tool to summarize the information in a more readable form, as in Listing 17-1. You can see that a particular statement was executed 163 times— execution statistics are also displayed. In this case, the number of logical reads—the number of buffers gotten for consistent read—is zero because the information is coming from dynamic performance tables, not from actual database tables.
CHAPTER 17 SQL TUNING 383 Listing 17-1. Using to Summarize a Trace File
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Beginning Oracle Database 11g Admin
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For Michelle. “Oh Fame!—if I e
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PART III Database Support CHAPTE
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viii CONTENTS CHAPTER 2 SQL and PL/
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x CONTENTS Client Installations ...
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xii CONTENTS Data Loading .........
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xiv CONTENTS Practical Demonstratio
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xvi CONTENTS PART IV Database Tu
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About the Author IGGY FERNANDEZ has
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Acknowledgments I would like to tha
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xxvi INTRODUCTION Who This Book Is
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xxviii INTRODUCTION performing afte
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xxx INTRODUCTION Chapter 14: Databa
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PART I Database Concepts
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4 CHAPTER 1 RELATIONAL DATABASE MA
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10 CHAPTER 1 RELATIONAL DATABASE M
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22 CHAPTER 2 SQL AND PL/SQL As an
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24 CHAPTER 2 SQL AND PL/SQL Listin
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26 CHAPTER 2 SQL AND PL/SQL Data D
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28 CHAPTER 2 SQL AND PL/SQL The DE
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30 CHAPTER 2 SQL AND PL/SQL
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32 CHAPTER 2 SQL AND PL/SQL Listin
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34 CHAPTER 2 SQL AND PL/SQL The ve
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36 CHAPTER 2 SQL AND PL/SQL In Cha
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38 CHAPTER 2 SQL AND PL/SQL Introd
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40 CHAPTER 2 SQL AND PL/SQL Storin
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48 CHAPTER 2 SQL AND PL/SQL Exerci
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CHAPTER 3 Oracle Architecture Try t
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CHAPTER 3 ORACLE ARCHITECTURE 53 D
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CHAPTER 3 ORACLE ARCHITECTURE 55 T
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CHAPTER 3 ORACLE ARCHITECTURE 61
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PART II Database Implementation
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66 CHAPTER 4 PLANNING in a separat
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68 CHAPTER 4 PLANNING Free to Down
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70 CHAPTER 4 PLANNING Architectura
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72 CHAPTER 4 PLANNING resources an
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74 CHAPTER 4 PLANNING Disk Sizing
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76 CHAPTER 4 PLANNING Disk Speed P
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78 CHAPTER 4 PLANNING t
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CHAPTER 5 Software Installation The
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CHAPTER 5 SOFTWARE INSTALLATION 83
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96 CHAPTER 6 DATABASE CREATION Nor
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100 CHAPTER 6 DATABASE CREATION 6.
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102 CHAPTER 6 DATABASE CREATION Th
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104 CHAPTER 6 DATABASE CREATION Fi
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132 CHAPTER 7 PHYSICAL DATABASE DE
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152 CHAPTER 8 USER MANAGEMENT AND
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PART III Database Support
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186 CHAPTER 9 TAKING CONTROL Listi
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188 CHAPTER 9 TAKING CONTROL Figur
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196 CHAPTER 9 TAKING CONTROL
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202 CHAPTER 10 MONITORING Monitori
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206 CHAPTER 10 MONITORING
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208 CHAPTER 10 MONITORING Listing
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220 CHAPTER 10 MONITORING Exercise
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CHAPTER 11 Fixing Problems Rise and
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CHAPTER 11 FIXING PROBLEMS 225 3.
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CHAPTER 11 FIXING PROBLEMS 227 Not
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CHAPTER 11 FIXING PROBLEMS 229
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CHAPTER 11 FIXING PROBLEMS 231 One
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CHAPTER 11 FIXING PROBLEMS 233 Fig
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CHAPTER 11 FIXING PROBLEMS 239 Rem
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CHAPTER 11 FIXING PROBLEMS 241 A v
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CHAPTER 11 FIXING PROBLEMS 247 The
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CHAPTER 12 Backups As to our Conduc
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CHAPTER 12 BACKUPS 257 resources u
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CHAPTER 12 BACKUPS 259 backup mana
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CHAPTER 12 BACKUPS 261 Oracle-Mana
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CHAPTER 12 BACKUPS 263 RMAN procee
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CHAPTER 12 BACKUPS 265
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CHAPTER 12 BACKUPS 269 A concise
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CHAPTER 12 BACKUPS 275 Figure 12-2
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CHAPTER 13 Recovery These Officers,
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CHAPTER 13 RECOVERY 281 base admin
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CHAPTER 13 RECOVERY 283 Flashbac
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CHAPTER 13 RECOVERY 285
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CHAPTER 13 RECOVERY 289 Figure 13-
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CHAPTER 13 RECOVERY 291 Note
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CHAPTER 13 RECOVERY 299 Figure 13-
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CHAPTER 13 RECOVERY 301 Documentat
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CHAPTER 13 RECOVERY 303 g Lic
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CHAPTER 14 Database Maintenance “
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CHAPTER 14 DATABASE MAINTENANCE 30
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Page 350 and 351: CHAPTER 15 The Big Picture and the
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Page 374 and 375: PART IV Database Tuning
Page 376 and 377: 358 CHAPTER 16 INSTANCE TUNING “
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Page 436 and 437: 418 INDEX backout section, 349 back
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Beginning Oracle Database 11g Administration From Novice to Professional

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