Differences between sys and system in Oracle databases

Sys is the account with the highest permissions in the Oracle database and has the create database permission. system does not have this permission. The role of sys is sysdba, and the role of system is sysoper.

The remaining permissions are shared by the two users:

Startup/shutdown/dba can be managed by both users.

You can use system to manage databases. This user's permissions are sufficient for common database management.

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

Specified tively, this 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 privilege allows a user to perform basic operational tasks, but without the ability to look at user data