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ORA-31670: Username argument must be specified and non-null.
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Answer / 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.
Please add more information about this Error
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