This section discusses how you can use DB reconnect to reconnect to a standby database instance.
This setup uses parallel database technology, where application hosts are connected to one database instance with an additional database instance on another host available as a standby instance. The following diagram illustrates this situation:
DB Reconnect to Available Instance: Example Using Oracle
If a work process loses connection to the primary database instance, the work process tries to establish a database connection to the same or a standby instance. The configuration and customization of the switchover behavior partially depends on the database vendor and is described in “Parameters for Reconnect to Available Instance” in DB Reconnect Parameters.