I know that this is an old thread, but I was having the same problem and Google popped it to the top of the list when I searched for 'perl oracle connect as sysdba'. Just in case anyone else starts looking for an answer to this, the solution is to use a dsn of 'dbi:Oracle:' and undef for the username and password. Provided that you are running as oracle (or are a member of the dba group) on the host where the database is running and you have the ORACLE_SID variable set properly and you use the ora_session_mode => ORA_SYSDBA pair in the connection hash you will connect OK. At least that worked for me.

In reply to Re^3: Connecting 'as sysdba' using DBD::Oracle by Anonymous Monk
in thread Connecting 'as sysdba' using DBD::Oracle by laminee

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