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You're reading from  Oracle Database 11gR2 Performance Tuning Cookbook

Product typeBook
Published inJan 2012
Reading LevelIntermediate
PublisherPackt
ISBN-139781849682602
Edition1st Edition
Languages
Java
Tools
Oracle Database
Concepts
Database Administration
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Author (1)
Ciro Fiorillo
Ciro Fiorillo
author image
Ciro Fiorillo

Ciro Fiorillo is an IT professional and consultant with experience of more than a decade in different roles (developer, analyst, DBA, project manager, data and software architect) among software industries. He has worked on different technologies and architectures, such as Oracle, SQL Server, Delphi, C# and .NET Framework, C/C++, Java, PHP, COBOL, Fortran, and Tibco. Ciro is currently employed as Lead Software and Data Architect with FinWin Srl, a software house specializing in banking and loans applications. As a freelancer he writes articles for websites and printed magazines about software and computing, participates in workshops, and teaches C++ and Fortran parallel programming with Intel Software tools. Ciro can be reached at ciro@cirofiorillo.com.
Read more about Ciro Fiorillo

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DBA_WAITERS

This view shows all the sessions waiting for a lock. It correlates a blocked transaction to the blocking one.

Fields

The most relevant view fields are as follows:

  • WAITING_SESSION: The ID of the waiting session

  • HOLDING_SESSION: The ID of the session holding the lock

  • LOCK_TYPE: The type of lock

  • MODE_HELD: The locking mode held

  • MODE_REQUESTED: The locking mode requested

See also

  • The DBA_BLOCKERS, V$LOCK, and V$LOCKED_OBJECT sections in this appendix

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Oracle Database 11gR2 Performance Tuning Cookbook
Published in: Jan 2012Publisher: PacktISBN-13: 9781849682602
© 2012 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Ciro Fiorillo

Ciro Fiorillo is an IT professional and consultant with experience of more than a decade in different roles (developer, analyst, DBA, project manager, data and software architect) among software industries. He has worked on different technologies and architectures, such as Oracle, SQL Server, Delphi, C# and .NET Framework, C/C++, Java, PHP, COBOL, Fortran, and Tibco. Ciro is currently employed as Lead Software and Data Architect with FinWin Srl, a software house specializing in banking and loans applications. As a freelancer he writes articles for websites and printed magazines about software and computing, participates in workshops, and teaches C++ and Fortran parallel programming with Intel Software tools. Ciro can be reached at ciro@cirofiorillo.com.
Read more about Ciro Fiorillo

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