This section describes aspects of managing roles, and includes the 
following topics:

Creating role.
Predefined role.

A ROLE groups several PRIVILEGES AND ROLES, so that they can be granted and 
revoked simultaneously from users. Roles can be enabled and disabled per 
user.

Creating role:

You can create a role using either the sql command create role, or the 
create role property sheet of enterprise manager.

You must have the create role system privilege to create a role. Typically, 
only security administrators have this system privilege.

Predefined roles:

The roles listed in table are automatically defined for oracle databases. 
These roles are provided for backward compatibility to earlier versions of 
oracle.

For more information, click the link below.

http://mindmajix.com/oracle-dba/managing-user-roles

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