Oracle Real Application Clusters (RAC) is a cluster database that uses a shared cache architecture. In Oracle 10g Release 2, a High Availability (HA) client connected to an RAC database can register a callback to indicate that it wants the server to notify it in case of a database failure event that affects a connection made by the client.
To take advantage of this feature, PowerBuilder users can script a new event, DBNotification, that has been added to the Transaction object. For more information, see the description of the DBNotification event and the HANotification database parameter in the online Help.
