Using the Sun Cluster LogicalHostname Resource With Oracle Parallel Server/Real Application Clusters

If a cluster node that is running an instance of Oracle Parallel Server/Real Application Clusters fails, an operation that a client application attempted might be required to time out before the operation is attempted again on another instance. If the Transmission Control Protocol/Internet Protocol (TCP/IP) network timeout is high, the client application might require a significant length of time to detect the failure. Typically, client applications require between three and nine minutes to detect such failures.

In such situations, client applications can use the Sun Cluster LogicalHostname resource for connecting to an Oracle Parallel Server/Real Application Clusters database that is running on Sun Cluster. You can configure the LogicalHostname resource in a separate resource group that is mastered on the nodes on which Oracle Parallel Server/Real Application Clusters is running. If a node fails, the LogicalHostname resource fails over to another surviving node on which Oracle Parallel Server/Real Application Clusters is running. The failover of the LogicalHostname resource enables new connections to be directed to the other instance of Oracle Parallel Server/Real Application Clusters.

Before using the LogicalHostname resource for this purpose, consider the effect on existing user connections of failover or failback of the LogicalHostname resource.