High availability

From a performance perspective, you need to configure the system so that it can quickly discover the Oracle failure and to quickly recover the connections.

The system is made up of client programs that connect to the Oracle instance. These include:

Oracle WebLogic, IBM® WebSphere® application servers.
Agents or monitors.

TCP/IP

The default time for a connection request to an unavailable node to timeout is deliberately set to a high value. This value allows connection requests (e.g., telnet connections) the opportunity to find the node on the Internet. This setting is less applicable in a high-speed switched network.

Fast application notification support

Fast Application Notification (FAN) provides RAC the ability to inform the client programs the status of the cluster. With FAN, the client programs, especially those with connection pools, can drop stale connections to failed nodes.

The application does not support FAN.