According to the DBD::Oracle documentation the username and password are supposed to be blank.
Also the username and password should be empty, and the user executing the script needs to be part of the dba group or osdba group.
Which according to me seems correct as while connecting sqlplus '/as sysdba' we do not provide any username/password.

In reply to Re^2: Connecting 'as sysdba' using DBD::Oracle by laminee
in thread Connecting 'as sysdba' using DBD::Oracle by laminee

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