ORA-00483

Error: ORA-00483: During shutdown a process abnormally terminated

Causa: One of the background processes did not exit normally at or near the time of shutdown.

Acción: Use the SHUTDOWN ABORT command. Check the accompanying messages, if any, and the background process trace file. Correct the problem mentioned in the messages. Then shut down and restart the instance. If the trace file mentions any other background process messages, check the trace file for the mentioned process until the root message is found.