$ sqlplus scott/tiger@orcl
@orc1 -> tnsnames.ora – connection node name
scott -> db username
tiger -> db username password
$ sqlplus / as sysdba@orcl
Login as sysdba with this.
@orc1 -> tnsnames.ora – connection node name
scott -> db username
tiger -> db username password
$ sqlplus / as sysdba@orcl
Login as sysdba with this.