rac 重建undo

select segment_name,status,tablespace_name from dba_rollback_segs where status not in ('ONLINE','OFFLINE') and tablespace_name='UNDOTBS5'; 

SEGMENT_NAME
------------------------------------------------------------------------------------------
STATUS
------------------------------------------------
TABLESPACE_NAME
------------------------------------------------------------------------------------------
_SYSSMU1$
NEEDS RECOVERY
UNDOTBS5

_SYSSMU117$
NEEDS RECOVERY
UNDOTBS5

_SYSSMU750$
NEEDS RECOVERY
UNDOTBS5

_SYSSMU780$
NEEDS RECOVERY
UNDOTBS5

发现有4个undo 段不正常。

无法drop

16:39:16 sys@bt>alter rollback segment "_SYSSMU1$"   offline  ;
 
Rollback segment altered.
 
Elapsed: 00:00:00.01
16:39:45 sys@bt>alter rollback segment "_SYSSMU117$" offline  ;
 
Rollback segment altered.
 
Elapsed: 00:00:00.00
16:39:45 sys@bt>alter rollback segment "_SYSSMU750$" offline  ;
 
Rollback segment altered.
 
Elapsed: 00:00:00.00
16:39:45 sys@bt>alter rollback segment "_SYSSMU780$" offline  ;
 
Rollback segment altered.
 
Elapsed: 00:00:00.01
16:39:45 sys@bt>
16:39:46 sys@bt>
16:39:46 sys@bt>                                            
16:40:00 sys@bt>drop       rollback segment "_SYSSMU1$"   ; 
drop       rollback segment "_SYSSMU117$" ; 
drop       rollback segment "_SYSSMU1$"
*
ERROR at line 1:
ORA-30025: DROP segment '_SYSSMU1$' (in undo tablespace) not allowed
 
 
Elapsed: 00:00:00.02
16:40:00 sys@bt>drop       rollback segment "_SYSSMU750$" ; 
drop       rollback segment "_SYSSMU117$"
*
ERROR at line 1:
ORA-30025: DROP segment '_SYSSMU117$' (in undo tablespace) not allowed

 

需要将undo_management改为manual 后，使用隐含参数

_CORRUPTED_ROLLBACK_SEGMENTS=(_SYSSMU1$,_SYSSMU117$,_SYSSMU750$,_SYSSMU780$)

 

然后可以顺利的删除。

drop       rollback segment "_SYSSMU1$"   ; 
drop       rollback segment "_SYSSMU117$" ; 
drop       rollback segment "_SYSSMU750$" ; 
drop       rollback segment "_SYSSMU780$" ; 

 

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