修复损坏的UNDO段-优快云博客

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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