oracle user

SQL> desc dba_users;
이름                                      널?      유형
----------------------------------------- -------- --------------
USERNAME                              NOT NULL VARCHAR2(30)
USER_ID                                   NOT NULL NUMBER
PASSWORD                                               VARCHAR2(30)
ACCOUNT_STATUS                   NOT NULL VARCHAR2(32)
LOCK_DATE                                              DATE
EXPIRY_DATE                                            DATE
DEFAULT_TABLESPACE            NOT NULL VARCHAR2(30)
TEMPORARY_TABLESPACE       NOT NULL VARCHAR2(30)
CREATED                                 NOT NULL DATE
PROFILE                                   NOT NULL VARCHAR2(30)
INITIAL_RSRC_CONSUMER_GROUP             VARCHAR2(30)
EXTERNAL_NAME                                      VARCHAR2(4000)