Cache Agent and Replication Connection Recovery

When a connection from the cache agent to the Oracle database fails, the cache agent attempts to connect every 10 seconds. If the cache agent cannot connect to the Oracle database, the cache agent restarts after 10 minutes. This behavior repeats forever.

When a connection from the replication agent to the Oracle database fails, the replication agent attempts to reconnect to the Oracle database after 120 seconds. If it cannot reconnect after 120 seconds, the replication agent stops and does not restart.

If Fast Application Notification (FAN) is enabled on the Oracle database, the cache agent and the replication agent receive immediate notification of connection failures. If FAN is not enabled, the agents may wait until a TCP timeout occurs before becoming aware that the connection has failed.

If the Oracle Real Application Clusters (Oracle RAC) is enable on the Oracle database, along with FAN and Transparent Application Failover (TAF), then TAF manages the connection to a new Oracle Database instance. See Using Cache in an Oracle RAC Environment.