Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 E-mail Us
 Oracle Articles
New Oracle Articles

 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog

 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 







Data Guard Role Transition Tips

Oracle Database Tips by Donald BurlesonDecember 9, 2015

Oracle Data Guard Types of Database Role Transitions

Oracle9i supports two types of role transitions: switchover and failover. The failover transition can be further categorized into graceful failover and forced failover depending on the amount of data lost during the failover operation. The following sections will present these role transitions in detail.

Role Transition Using Switchover

A switchover operation is a smooth transition of a Oracle instance into the primary role and the primary database into a standby role. This is a two-way activity. During a switchover operation, no data is lost; however, the database services may be affected for the period of time that the databases are switching their roles.

Switchover operation is ideal for performing maintenance activities on the original primary database. These maintenance activities cannot include an upgrade of Oracle software because in a Data Guard configuration, the primary and all the standby databases should be running the same Oracle software release.

Role Transition Using Failover

A failover operation is a true disaster recovery operation. Failover to one of the Oracle instance in Data Guard configuration is performed when the original primary database is damaged beyond easy and timely recovery. Contrary to switchover, a failover operation is a one-way operation that transforms the Oracle instance into the primary database.

The above text is an excerpt from the book: Oracle Data Guard Handbook

Oracle Training at Sea
oracle dba poster

Follow us on Twitter 
Oracle performance tuning software 
Oracle Linux poster


Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


Copyright © 1996 -  2020

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.