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Oracle Database 11gR2 Performance Tuning Cookbook

You're reading from   Oracle Database 11gR2 Performance Tuning Cookbook Shifting your Oracle Database into top gear takes a lot of know-how and fine-tuning ability. The 80+ recipes in this Cookbook will give you those skills along with the ability to troubleshoot if things starts running slowly.

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Product type Paperback
Published in Jan 2012
Publisher Packt
ISBN-13 9781849682602
Length 542 pages
Edition 1st Edition
Languages
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Author (1):
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Ciro Fiorillo Ciro Fiorillo
Author Profile Icon Ciro Fiorillo
Ciro Fiorillo
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Table of Contents (21) Chapters Close

Oracle Database 11gR2 Performance Tuning Cookbook
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
1. Starting with Performance Tuning FREE CHAPTER 2. Optimizing Application Design 3. Optimizing Storage Structures 4. Optimizing SQL Code 5. Optimizing Sort Operations 6. Optimizing PL/SQL Code 7. Improving the Oracle Optimizer 8. Other Optimizations 9. Tuning Memory 10. Tuning I/O 11. Tuning Contention Dynamic Performance Views A Summary of Oracle Packages Used for Performance Tuning Index

V$SQL


This view lists statistics on shared SQL areas.

Fields

The most relevant view fields are as follows:

  • SQL_ID: The identifier of the parent cursor in the library cache

  • SQL_TEXT: The first thousand characters of the SQL text

  • SQL_FULLTEXT: The full text of the SQL statement

  • EXECUTIONS: The number of executions that took place on this object since it was brought into the library cache

  • INVALIDATIONS: The number of times this child cursor has been invalidated

  • PARSE_CALLS: The number of parse calls for this child cursor

  • IS_BIND_SENSITIVE: This indicates whether the cursor is bind sensitive (Y) or not (N). A query is considered bind-sensitive if the optimizer peeked at one of its bind variable values when computing predicate selectivity and where a change in a bind variable value may cause the optimizer to generate a different plan

  • IS_BIND_AWARE: This indicates whether the cursor is bind aware (Y) or not (N); a query is considered bind-aware if it has been marked to use extended cursor sharing

  • IS_SHAREABLE: This indicates whether the cursor can be shared (Y) or not (N)

See also

  • The V$SESSION, V$SQL_PLAN, and V$SQLAREA sections in this appendix

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