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Donald K. Burleson

Oracle RAC Tips

Cluster Objectives

Traditionally, the term cluster was used to represent ‘Server Clusters’. Clustered systems are synonymous with a group of servers. The server, being the main layer or platform where the database or application service resides, is the most important component in providing availability and high performance.

Clusters, with multiple nodes, primarily aim at protecting server availability. Any failure in a server is transparent to end-users and is hidden by the failover of the application or database to a surviving node. End users or clients have access to the surviving node, thus allowing processing to continue. In another situation, a group of nodes are joined together to provide database services, as in a parallel database. Failure of a single node does not interrupt access to the database since the secondary nodes are still active in providing database access.

Thus the cluster technology focuses on providing an alternative to a failed server. However, we have to realize that there are many other layers or components, each of which is significant in maintaining overall availability of the database or application service. Although the server (node) is a very crucial component and plays the key role in running the database or application, there are other components, such as the disk storage units and networking equipment for which we need to provide alternatives or backups to meet the failure conditions. The traditional concept of clustering revolves around server clustering only.

With this in mind, administrators and managers should provide adequate redundancy for other components in order to have an effective high availability environment.

For more information, see the book Oracle 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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