Getting Started with IBM Data Studio for DB2

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214 Getting Started with IBM Data Studio for DB2 Note: Understanding how DB2 chooses an access path and other concepts related to query tuning are beyond the scope of this book. It’s a good idea to read up on some concepts. Here are some sources: DB2 information center: http://pic.dhe.ibm.com/infocenter/db2luw/v10r1/topic/com.ibm.db2.luw.admin.perf.doc/do c/c0054924.html DB2 query tuning best practices: http://www.ibm.com/developerworks/data/bestpractices/querytuning/ SQL tips for DB2: https://www.ibm.com/developerworks/mydeveloperworks/blogs/SQLTips4DB2LUW/?lan g=en Data Studio can help make query tuning easier because it lets you: See in a diagram the execution plan that DB2 uses to run a statement Format a statement so that it is easier to read and understand. Find out whether the existing statistics are accurate for database objects that are involved in the execution of a statement. If the statistics are not, a tool called the Statistics Advisor can recommend RUNSTATS control statements for fixing them. Note that there are more extensive query tuning tools and other advisors available in the chargeable product InfoSphere Optim Query Workload Tuner 3.1.1. 7.2 Configuring DB2 to enable query tuning To use query tuning, you must create a database connection as given in Chapter 2 and that database must be configured to enable query tuning. This section describes how to use the configuration wizard to configure query tuning. To tune queries, you must switch to the IBM Query Tuning perspective. Open the Window menu and select Open Perspective -> Other, then choose the IBM Query Tuning perspective, as shown in Figure 7.1.
Chapter 7 – Tuning queries 215 Figure 7.1 – Opening the IBM Query Tuning perspective The IBM Query Tuning perspective is shown in Figure 7.2. Use the Data Source Explorer to connect to local or remote databases.
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3 Notices This information was deve
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Table of contents 5 Table of conten
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3.3.1 Exporting data...............
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Chapter 7 - Tuning queries ........
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11.4 Community and resources ......
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Preface 13 Keeping your skills curr
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around the world have participated
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17 About the authors Dimple Bhatia
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Contributors 19 The following peopl
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21 Acknowledgements The authors owe
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24 Getting Started with IBM Data St
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100 Getting Started with IBM Data S
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103 Chapter 3 - Maintaining the dat
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159 Chapter 5 - Creating SQL and XQ
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Chapter 5 - Creating SQL and XQuery
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355 Appendix D - The Sample Outdoor
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Appendix E - Advanced topics for de
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E.5.4 Data web services artifacts A
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References 391 References [1] HAYES
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References 393 Books and articles 1
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396 Getting started with IBM Data S
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