Answer / prakash0106

The SYS user owns the data dictionary. The SYS and SYSTEM
users are created when the database is created.

Answer / nasir

The Oracle user SYS owns all base tables and user-
accessible views of the data dictionary. Therefore, no
Oracle user should ever alter (update, delete, or insert)
any rows or schema objects contained in the SYS schema,
because such activity can compromise data integrity. The
security administrator should keep strict control of this
central account.

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