Oracle Integration Classic (User-Managed) Fails to Connect to the Database Instance

If Oracle Integration Classic (user-managed) fails to connect to the database instance for a period of four hours or more, you should restart your Oracle Integration Classic instance.

By default, the maximum amount of time that an Oracle Integration Classic instance tries to recover from a database connection failure without any intervention is four hours.  After this period of time, manually restart the Oracle Integration Classic instance if the connectivity issue is not resolved.