After the successful installation of oracle, three users
sys will be generated by default : the super administrator has the highest
login method
SQL> conn /as sysdba;
connected.
SQL> show user;
USER is the "SYS"
system user : it is a system administrator, and his role is dbaoper. The
password is defined by the user, and the default is manager
SQL> conn system/Mayu2638;
connected.
SQL> show user;
USER is "SYSTEM"
scott user : the default password of ordinary user is tiger
SQL> conn scott/tiger;
connected.
SQL> show user;
USER is "SCOTT"