oracle12创建用户错误ORA-65096: 公用用户名或角色名无效 invalid common user or role name

SQL> create user "fdf01" identified by "fdf01";
create user "fdf01" identified by "fdf01"
            *
ERROR at line 1:
ORA-65096: invalid common user or role name

SQL> create user C##fdf01 IDENTIFIED BY  fdf01;

User created.

根据错误提示了解，在CDB中用户得以C##开头;