"worker process interrupt for normal exit by master process"
*Cause: A worker process was requested to clean up and exit because the
master process is doing a normal exit.
*Action: If this error occurs from a Data Pump client (e.g. expdp or
impdp). it means that the master process for the operation exited
prematurely. Try the operation again. If the error occurs again,
contact Oracle Customer Support and report the error.