我的回滚段怎么在实例启动的时候不自动ONLINE呢？？？？

SEGMENT_NAME                   TABLESPACE_NAME                OWNER
------------------------------ ------------------------------ ------
STATUS
----------------
SYSTEM                         SYSTEM                         SYS
ONLINE_SYSSMU1$                      UNDOTBS1                       PUBLIC
ONLINE_SYSSMU2$                      UNDOTBS1                       PUBLIC
ONLINE
SEGMENT_NAME                   TABLESPACE_NAME                OWNER
------------------------------ ------------------------------ ------
STATUS
----------------
_SYSSMU3$                      UNDOTBS1                       PUBLIC
ONLINE_SYSSMU4$                      UNDOTBS1                       PUBLIC
ONLINE_SYSSMU5$                      UNDOTBS1                       PUBLIC
ONLINE
SEGMENT_NAME                   TABLESPACE_NAME                OWNER
------------------------------ ------------------------------ ------
STATUS
----------------
_SYSSMU6$                      UNDOTBS1                       PUBLIC
ONLINE_SYSSMU7$                      UNDOTBS1                       PUBLIC
ONLINE_SYSSMU8$                      UNDOTBS1                       PUBLIC
ONLINE
SEGMENT_NAME                   TABLESPACE_NAME                OWNER
------------------------------ ------------------------------ ------
STATUS
----------------
_SYSSMU9$                      UNDOTBS1                       PUBLIC
ONLINE_SYSSMU10$                     UNDOTBS1                       PUBLIC
ONLINERBS01                          SYSTEM                         PUBLIC
OFFLINE
SEGMENT_NAME                   TABLESPACE_NAME                OWNER
------------------------------ ------------------------------ ------
STATUS
----------------
RB20                           ROLLBACK_GLC                   PUBLIC
OFFLINERB01                           ROLLBACK_GLC                   PUBLIC
OFFLINERB02                           ROLLBACK_GLC                   PUBLIC
OFFLINE
SEGMENT_NAME                   TABLESPACE_NAME                OWNER
------------------------------ ------------------------------ ------
STATUS
----------------
RB03                           ROLLBACK_GLC                   PUBLIC
OFFLINERB04                           ROLLBACK_GLC                   PUBLIC
OFFLINERB05                           ROLLBACK_GLC                   PUBLIC
OFFLINE
SEGMENT_NAME                   TABLESPACE_NAME                OWNER
------------------------------ ------------------------------ ------
STATUS
----------------
RB06                           ROLLBACK_GLC                   PUBLIC
OFFLINERB07                           ROLLBACK_GLC                   PUBLIC
OFFLINERB08                           ROLLBACK_GLC                   PUBLIC
OFFLINE
SEGMENT_NAME                   TABLESPACE_NAME                OWNER
------------------------------ ------------------------------ ------
STATUS
----------------
RB09                           ROLLBACK_GLC                   PUBLIC
OFFLINERB10                           ROLLBACK_GLC                   PUBLIC
OFFLINERB11                           ROLLBACK_GLC                   PUBLIC
OFFLINE
SEGMENT_NAME                   TABLESPACE_NAME                OWNER
------------------------------ ------------------------------ ------
STATUS
----------------
RB12                           ROLLBACK_GLC                   PUBLIC
OFFLINERB13                           ROLLBACK_GLC                   PUBLIC
OFFLINERB14                           ROLLBACK_GLC                   PUBLIC
OFFLINE
SEGMENT_NAME                   TABLESPACE_NAME                OWNER
------------------------------ ------------------------------ ------
STATUS
----------------
RB15                           ROLLBACK_GLC                   PUBLIC
OFFLINERB16                           ROLLBACK_GLC                   PUBLIC
OFFLINERB17                           ROLLBACK_GLC                   PUBLIC
OFFLINE
SEGMENT_NAME                   TABLESPACE_NAME                OWNER
------------------------------ ------------------------------ ------
STATUS
----------------
RB18                           ROLLBACK_GLC                   PUBLIC
OFFLINERB19                           ROLLBACK_GLC                   PUBLIC
OFFLINE