Cause: Called change user with a NULL username or a null string. Action:

ORA-31670: Username argument must be specified and non-null.

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Answer Posted / guest

Cause: Called change user with a NULL username or a null string.

Action: Specify a valid username argument. If this error
occurs from a Data Pump client (e.g. expdp or impdp), try
the operation again. If the error occurs again, contact
Oracle Customer Support and report the error.

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