Submitted by: Maxim Kuzmin (cybermax)

Add the ability to learn in a trigger ON DISCONNECT reason of disconnect, such as a normal shutdown, DELETE FROM MON$ATTACHMENTS, shutdown or stop the server service. Its need for logging action users and searching problems, for example:
USER XXX CONNECTED AT 01.06.2011 10:00:00
USER XXX DISCONNECTED AT 01.06.2011 10:25:12 (client not responding) <-- here the user's computer was rebooted
USER XXX CONNECTED AT 01.06.2011 11:00:00
USER XXX DISCONNECTED AT 01.06.2011 11:15:00 (deleted by SYSDBA)
USER XXX CONNECTED AT 01.06.2011 11:16:00
USER XXX DISCONNECTED AT 01.06.2011 11:20:34 (database shutdown)
USER XXX CONNECTED AT 01.06.2011 13:00:00
USER XXX DISCONNECTED AT 01.06.2011 16:55:59 (client detach)