HOW to prevent login as a "SYSDBA" oracle
1) First step is to find file : "SQLNET.ora" and you can find this here : [ORACLE_HOME]\NETWORK\ADMIN2) Find Statement : SQLNET.AUTHENTICATION_SERVICES= (NTS)3) Remove NTS parameter from above statement4) Thats It! Now try to login as "/ as sysdba" or "username/password as sysdba"5) NONE WILL WORK OUT ! Thats what you wann!Thank yOuI love Oracle...