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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.


 

 

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