What is the difference between SYS and SYSTEM users?

SYS and SYSTEM are the default users that will be created when we install and create an oracle database.

SYS user is the owner of all data dictionary objects and has SYSDBA and SYSOPER roles.

Some of the major uses of SYS user include but not limited to:

• helps to create a database
• shutdown and startup of an instance
• do backup and recovery
• Adding and moving data files

But SYSTEM user is just a schema that has been granted  the DBA role.

Note: we can create users and assign them a DBA role