Support for HA event notification

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 the DBNotification event of the Transaction object. For more
information, see the description of the DBNotification event and
the HANotification database parameter in the online Help.

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