Your error message text for the reported ORA-31676 error doesn't match
with what Oracle provides in the documentation:
31676, 00000, "illegal value for number of workers, %s"
// *Cause: Called create worker processes with an illegal number of
workers
// specified.
// *Action: Make sure that the number of workers value is greater than
0 and
// less than the maximum value for the platform (normally
32767). If
// this error occurs from a Data Pump client (e.g. expdp or
impdp)
// and you specified the parallel parameter, try the
operation again
// with a smaller value for the parallel parameter. If the
error
// occurs again, contact Oracle Customer Support and report
the error.
It DOES match with an ORA-31637, though:
31637, 00000, "cannot create job %s for user %s"
// *Cause: Unable to create or restart a job. Refer to any following
or
// prior error messages for clarification.
// *Action: Eliminate the problems indicated.
Without an Oracle version it's difficult to assess this situation and
provide an answer. It appears you typed in these messages from memory
-- please post the Oracle version and the exact error messages
reported by impdp using copy and paste. When this information is
available a possible solution can be offered.
David Fitzjarrell