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 







Oracle Failover Options tips

Server Tips by Burleson Consulting
December 24, 2003

There are four levels of failover technology within the Oracle software.  Each failover option has its own costs, advantages and disadvantages.


  • OracleRAC - This is the most power and complex of the failover solutions and offers continuous availability using Transparent Application Failover (TAF).  Click here to learn how RAC achieves fast failover. OracleReal Application Clusters is an extra-cost option.  The RAC prices are listed in the link below.

E-Business Global Price List Software Investment Guide

  • Oracle Streams - This is a high-speed replication solution that takes SQL directly from the log_buffer RAM area and replicates transactions to a remote database.  During a server crash, transactions can be quickly redirected to the replicated system. 

  • Oracle DataGuard - This is a free option with Oracle Enterprise Edition and provides for a automated standby database.  Upon server failure, a series of database procedures synchronizes the standby database and opens it to accept connections. Oracle DataGuard is free with Enterprise Edition

  • Oracle Standby Database - This is not an Oracle product, and it is a procedure used prior to Oracle Data Guard to create a standby database.  Oracle7 introduced mechanisms that allow a standby database to be constantly in recovery mode and to be refreshed from Oracle?s archived redo logs. In case of failure, the last redo log could be added to the standby database, and the database could be started in just a few minutes.

Note: Oracle standby servers need to be fully licensed if they are ?hot standby? servers that can be used for queries.  Cold standby servers used less than 10 days per year do not need to be licensed.

Also see these related notes on Oracle failover:

If you like Oracle tuning, you might enjoy my book "Oracle Tuning: The Definitive Reference", with 950 pages of tuning tips and scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



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.