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 







Using OS and Hardware Clusters for Oracle failover

Oracle Database Tips by Donald BurlesonMay 1, 2015


Question:  I need a high availability solution to failover transaction in case of a server failure and I understand that there are hardware-level tools that compete with Real Application Clusters.  Can you get 100% HA without RAC?

Answer:  The concept of clustering is to have a single set of database (dbf) files, that are accessed simultaneously by many Oracle instances.  That is quite different than the hardware and OS-level clustering tools which also provide failover.

But, yes, you don't need RAC to have a server failover mechanism, there are many other tools and techniques.  These tools all work in different ways, and some non-Oracle failover tools include:

  • Database Area Networks (DAN) - Upon server failure, the SAN re-mounts the disks on a new server and re-starts the failed instance on the new server.

  • n-way Oracle Streams - data is replicated to a failover server with a separate database

  • Red Hat Cluster Suite - Red Hat Cluster Manager is an application failover software package that allows a group of connected Linux servers (known as a cluster) to run the same application.

  • Dell Powervault disks - The PowerVault MD3000 enables administrators to configure a separate physical disk as a hot spare to provide additional fault tolerance, with a fast restart on a new server.

  • HP Proliant Cluster - HP ProLiant Clusters for Linux enables enterprises with mission-critical applications to implement high-availability database servers at a fraction of the cost of traditional UNIX? solutions.

  • Oracle Failsafe for Windows - Oracle's cold Failover Cluster solution for Windows.

  • Sun Cluster - In a Sun Cluster configuration. When running in a Sun Cluster configuration, an application runs as a resource under the control of the Resource Group Manager (RGM). A data service enables you to configure an application such as Sun Java System Web Server or Oracle database to run on a cluster instead of on a single server.



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.