Call for Oracle support & training (800) 766-1884
Free Oracle Tips

Corporate Oracle Training
Custom Oracle Training
Oracle New Features Training
Advanced Oracle DBA Classes
Oracle Tuning Courses
Oracle Tips & Tricks
Oracle Training Links
Oracle Training Links
Oracle Training Links

We are top for USA Oracle Training Clients


Free Oracle Tips


Free Oracle App Server Tips


Oracle support

Oracle training

Oracle tuning


Remote Oracle

Custom Oracle Training


  Oracle Tips by Burleson

Easy Oracle Automation
Chapter 4 -
Automatic Workload Repository and Automatic Database Diagnostic Monitor

Inside the Automatic Workload Repository Tables

In all versions prior to Oracle Database10g, the v$ views never captured time-series data. Administrators were forced to take snapshots using BSTAT-ESTAT or STATSPACK to see the changes over time.  Oracle Database10g introduces new v$ metric tables, v$eventmetric, v$waitclassmetric and v$waitclassmetric_history, which keep elapsed-time data.

In 10g, all v$ views that contain the BEGIN_TIME and END_TIME columns are used to store performance information. Because of the transient nature of the v$ views, this information needed to be persistent. This was accomplished by the introduction of the wrh$ tables in Oracle Database 10g.  The next section will provide a more detailed examination of the wrh$ wait event structure.

The AWR and ASH Wait Event Tables

Oracle Database 10g has radically changed the way it captures wait event information. There are a host of new v$ and wrh$ views related to Oracle wait events.  The list of wait events has been expanded and Oracle Database 10g now captures statistics on over 800 specific wait events.  The new wait events are a result of separating latch waits into their individual components and separating enqueue waits or locks into a finer level of granularity.

The foundation of the new wait event architecture is called the time model.  Oracle has introduced several important new wait event v$ views in 10g.

The above text is an excerpt from:

Easy Oracle Automation
Oracle10g Automatic Storage, Memory and Diagnostic Features

ISBN 0-9745993-6-0

by Dr. Arun Kumar R.

Download your Oracle scripts now:

The definitive Oracle Script collection for every Oracle professional DBA


Oracle performance tuning book



Oracle performance tuning software

Oracle performance tuning software
Oracle performance Tuning 10g reference poster
Oracle training in Linux commands
Oracle training Excel


email BC:

Copyright © 1996 -  2014 by Burleson Inc. All rights reserved.

Oracle® is the registered trademark of Oracle Corporation.