数据库没法修改与非键值保存表对应的列

数据库无法修改与非键值保存表对应的列
SQL> select * from dba_users;
 
USERNAME                          USER_ID PASSWORD                       ACCOUNT_STATUS                   LOCK_DATE   EXPIRY_DATE DEFAULT_TABLESPACE             TEMPORARY_TABLESPACE           CREATED     PROFILE                        INITIAL_RSRC_CONSUMER_GROUP    EXTERNAL_NAME
------------------------------ ---------- ------------------------------ -------------------------------- ----------- ----------- ------------------------------ ------------------------------ ----------- ------------------------------ ------------------------------ --------------------------------------------
MGMT_VIEW                              53 F25A184809D6458D               OPEN                                                     SYSTEM                         TEMP                           2005/8/30 1 DEFAULT                        DEFAULT_CONSUMER_GROUP         
SYS                                     0 8F496E0A85640576               OPEN                                                     SYSTEM                         TEMP                           2005/8/30 1 DEFAULT                        SYS_GROUP