A summary of the differences between SYS and system in Oracle _oracle

1.
The SYS user has DBA authority and has the SYS mode to log in to the database only through SYSDBA. is the highest-privileged account in the Oracle database
System has DBA authority. But no SYSDBA permissions. Usually use this account to manage the database on it.
2.
(1) SYS--SYSDBA
System--sysoper
(2) STARTUP/SHUTDOWN/DBA Management Two can do

(3) SYS owns the data dictionary (Dictionay), or Dictionay belongs to the SYS schema.

(4) Sysdba more than sysoper the right to create database
3.
SYSDBA
Perform STARTUP and SHUTDOWN operations
ALTER Database:open, Mount, back up, or change character set
CREATE DATABASE
CREATE SPFILE
Archivelog and RECOVERY
Includes the restricted session privilege
Effectively, this is System privilege allows a user to connect as user SYS.
Sysoper
Perform STARTUP and SHUTDOWN operations
CREATE SPFILE
ALTER DATABASE Open/mount/backup
Archivelog and RECOVERY
Includes the restricted session privilege
This is privilege allows a user to perform basic operational tasks, but without the ability to look at user data