"worker process interrupt for unexpected death of master process"
*Cause: A worker process was requested to clean up and exit (signaled
by PMON, doing cleanup because the master process died
*Action: If this error occurs from a Data Pump client (e.g. expdp or
impdp), it means that the master process for the operation died
unexpectedly. Check the log file for the operaton and the trace
file for the master process for any additional information. Try
the operation again. If the error occurs again, contact Oracle
Customer Support and report the error.