Killing a dispatcher process causes all clients connected to that dispatcher to be disconnected. Killing a shared server process only affects the clients currently being serviced by that shared server. This is none if the server is idle.
Before you kill a dispatcher process make sure MTS is not hung. Once your analysis is complete, you can kill dispatchers and/or shared servers to free up the system without having to restart the instance. They are automatically restarted by PMON after a few minutes.
Alla S. Pfauntsch
Oracle DBA
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"Life is what happens while you are planning something else".