Unable to create user from “scott” account with granted DBA

Question

Currently, playing around with Oracle DB 11g on Windows XP. Logged in as scott user (not sysdba) with granted DBA role. According to Oracle docs "DBA = All system privileges WITH ADMIN OPTION". Why then creation of a new user gives error "ORA-01031 insufficient privileges..."? Here's DDL command executed using SQL Developer:

CREATE USER john identified by 123

Answer 1

Check out document for SET ROLE and default role

To enable all roles granted to you for the current session, issue the following statement:

SET ROLE ALL;

Or modify user default role

ALTER USER scott DEFAULT ROLE ALL;