Oracle 11g Default User name (sys, system) differences

1,oracle Default user name, password

Username/Password Login identity (role) description
Sys/change_on_install SYSDBA, Sysoper cannot log in as NORMAL
System/manager NORMAL cannot log in with SYSDBA, Sysoper

Scott/tiger Normal Normal User

2, user sys and system

Sys : sysdba(System administrator) Sysoper(System Operator) dba(Database Administrator role)

system : DBA(Database Administrator role) Sysoper(systems operator)

3,SYSDBA and Sysoper

Sysdba	Sysoper
Startup (Startup database)	Startup
Shutdown (Close database)	Shutdown
ALTER DATABASE Open/mount/backup	ALTER DATABASE Open/mount/backup
Change Character Set	No
Create database (creating databases)	No
Drop database (delete databases)	No
Create SPFile	Create SPFile
ALTER DATABASE Archivelog (archive log)	ALTER DATABASE Archivelog
Have restricted session limit permissions	Have restricted session limit permissions
Allows the user to connect as a SYS user	There are some basic things you can do to view user data

After logging in is SYS	Public after landing

Oracle 11g Default User name (sys, system) differences