How to fix the Oracle error ORA-31670: Username argument must be specified and non-null.?

In this post, you’ll learn more about the Oracle ErrorORA-31670: Username argument must be specified and non-null. with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

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

Reason for the Error ORA-31670: Username argument must be specified and non-null.

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

How to fix the Error ORA-31670: Username argument must be specified and non-null. ?

You can fix this error in Oracle by following the below steps

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.