Overview of SYS and SYSTEM Users in Oracle

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Basically sys and system user called database administrator users

The users are created during database installation

Both users are automatically granted the DBA role

SYS User

Sys user can perform all admin operations

Owner of the database and data dictionary

All base tables and views of the database and dictionary’s stores sys schema

When connecting the sys user. Its should be made the sysdba or sysoper privileges

Connect sqlplus / as sysdba

Sysdba and sysoper users to perform high level of admin tasks

Ex:

Backup and recovery
Startup and shutdown
Alter database open/mount
Alter database Archivelog/Noarchivelog  

SYSTEM User

Owner of the additional internal tables and views

System user perform all admin tasks except DB upgrade, backup and recovery

Default password is manager

They contain administrative information used by the oracle tools.

Connect syatem/manager

Note:
For security reasons the default password of system and sys should be changed immediately after database creation.

Reference

Database startup and shutdown option àClick hear

Database creation steps àClickhear





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