Oracle SQLPlus ORA-01017 invalid credentials when specifying schema?

If you do not include the @db it will connect either via the TWO_TASk environment variable or do a local connection to the database on the machine you are connected to. The @db will lookup the connection information via the tnsnames. Ora and then connect.

I am guessing that you are connecting to two different databases. One you have the username/password combination and the other you do not.

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