Sun Cluster systems provide an environment that shares parallel execution of applications across all the nodes of the cluster by using parallel databases. Sun Cluster Support for Oracle Parallel Server/Real Application Clusters is a set of packages that, when installed, enables Oracle Parallel Server/Real Application Clusters to run on Sun Cluster nodes. This data service also enables Sun Cluster Support for Oracle Parallel Server/Real Application Clusters to be managed by using Sun Cluster commands.
A parallel application has been instrumented to run in a cluster environment so that the application can be mastered by two or more nodes simultaneously. In an Oracle Parallel Server/Real Application Clusters environment, multiple Oracle instances cooperate to provide access to the same shared database. The Oracle clients can use any of the instances to access the database. Thus, if one or more instances have failed, clients can connect to a surviving instance and continue to access the database.