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Oracle10g Grid Computing with RAC
Chapter 3 - High Performance and Highly Available
Database Clusters

Failover Process

Examples:

Veritas Cluster Server (VCS), Service Group is the basic unit of fail over. Service group fails over to backup node, when failure occurs at the primary node. Service groups consist of related resources that work together to deliver database service to clients. Service Groups allow you to monitor and control service availability as a whole, as opposed to the individual items (servers, disks, software, etc.) The failure of one critical item in the service group will cause the entire group to fail over to another system.

In Oracle database implementation within the framework of Microsoft Cluster Service (MSC), the Cluster Group includes the following resources.

One or more virtual addresses, each of which consists of an IP address and network name:

  • The Oracle database server
     

  • All disks used by the Oracle database
     

  • A Net8 (or SQL*Net) network listener that listens on the virtual address (or addresses) of the group for connection requests to the databases in the group
     

  • An Oracle Intelligent Agent configured to use one of the group’s virtual addresses (if Oracle Enterprise Manager will be used to manage the database)

The Cluster group is the basic failover unit in case of MSC. Oracle provides failsafe manager tools to configure and manage Oracle database service failover with in MSC framework.


For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.


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Burleson Oracle Consulting offers Senior Oracle consultants which are available for all areas of Oracle support.  Common Oracle consulting support activities include short-term Oracle tuning, Oracle database troubleshooting, Oracle9i and Oracle10g migration, Oracle9iAS App Server consulting, Oracle design reviews and Oracle requirements evaluation support. Oracle support and Oracle consulting services are priced by the hour, so you only pay for what you need. These one-time Oracle consulting services commonly include:

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