This figure shows an Oracle CEP high availability multi-server domain with one active and two primaries. The input streams are connected to all servers. Only the primary outputs events to the output streams. Each secondary buffers output events. All the servers belong to the same deployment group and notification group. Primary Server 1 has failed and failedover to Server 2 which is the new primary. The input streams are no longer connected to Server 1. Server 2 is now outputting events to the output streams and Server 3 continues to buffer its output events.