Use system to create a new user

• New database user

           create user username identified by password;

• Grant user permissions

1. Login link permission: connect
2. Database resource operation authority, that is, operating database tables: resource
3. DBA  is the highest authority of Oralce. He has all the authority of Oracle . Users with DBA authority have the authority to create users, create tables, and create schemas. Generally do not need to grant this permission

                  grant connect, resource, dba to username;