If
an administrative user belongs to "dba" group on UNIX or
"ORA_DBA" (ORA_sid_DBA) group on Windows, One can connect to Oracle Database like this
connect
/ as sysdba
No
password is required. This is equivalent to the desupported "connect
internal" method.
A
password is required for "non – secure" administrative access. These
passwords are stored in password files.
Remote
connections via Net8 are classified as non – secure
Example
connect
sys/password as sysdba