Oracle Database Administration - Overview Externally Authenticated Users
When we are connect to Oracle Database, we can use "sqlplus / as sysdba" with SQL*Plus tool and connecting database with "SYS" user.
I showed, how to we can connect to database with "sqlplus /" - without write username/password, with operating system (windows) users. This way is same for other operation systems.
YouTube : http://www.youtube.com/watch?v=Vpgdg8hYsb8