UNDO Segment in Needs Recovery Mode

Question

Hi,
1) I created a different UNDO Tablespace and point UNDO_TABLESPACE to it.
2) The i made the UNDO Tablespace OFFLINE.
3) When i query the status column of dba_rollback_segs it displays that one UNDO Segment needs recovery.
4) When i query v$datafile to find the status of the datafiles associated with the UNDO Segment it displays that all the data files are OFFLINE.
SQL> select segment_name,status,tablespace_name from dba_rollback_segs where tablespace_name like 'UNDO%';
SEGMENT_NAME STATUS TABLESPACE_NAME
SYSSMU11580673410$ ONLINE UNDO_TS
SYSSMU1064169346335$ NEEDS RECOVERY UNDO_TBS
SYSSMU107348590359$ OFFLINE UNDO_TBS
SQL> Select status ,name,file# from v$datafile where ts# in (Select ts# from v$tablespace where name='UNDO_TBS');
STATUS NAME FILE#
OFFLINE /x1/oradata/db1/undo_tbs_05.dbf 13
OFFLINE /x1/oradata/db1/undo_tbs_06.dbf 14
OFFLINE /x2/oradata/db1/undo_tbs_02.dbf 20
OFFLINE /x2/oradata/db1/undo_tbs_03.dbf 21
OFFLINE /x1/oradata/db1/undo_tbs_04.dbf 22
OFFLINE /x2/oradata/db1/undo_tbs_01.dbf 27
The dabase is in noarchivelog mode and the version is 11.2.0.2.0.
Please suggest what should i do. I am unable to drop the old UNDO_TBS.

Answer 1

I tried doing the following ( but it simply doesnot work)
1) set undo_management='MANUAL' and OFFLINE_ROLLBACK_SEGMENTS=_SYSSMU106 in init.ora
2) Did a clean shutdown using SHUTDOWN IMMEDIATE and then STARTUP
3)
SQL> select segment_name,status,tablespace_name from dba_rollback_segs where tablespace_name like 'UNDO%';
SEGMENT_NAME STATUS TABLESPACE_NAME
SYSSMU11580673410$ ONLINE UNDO_TS
SYSSMU1064169346335$ NEEDS RECOVERY UNDO_TBS
SYSSMU107348590359$ OFFLINE UNDO_TBS
SQL> drop rollback segment "_SYSSMU106";
Rollback segment dropped.
SQL> select segment_name,status,tablespace_name from dba_rollback_segs where tablespace_name like 'UNDO%';
SEGMENT_NAME STATUS TABLESPACE_NAME
SYSSMU11580673410$ ONLINE UNDO_TS
SYSSMU1064169346335$ NEEDS RECOVERY UNDO_TBS
SYSSMU107348590359$ OFFLINE UNDO_TBS
SQL> drop tablespace UNDO_TBS including contents and datafiles;
drop tablespace UNDO_TBS including contents and datafiles
ERROR at line 1:
ORA-01548: active rollback segment '_SYSSMU106_4169346335$' found, terminate
dropping tablespace
SQL> Select status ,name,file# from v$datafile where ts# in (Select ts# from v$tablespace where name='UNDO_TBS');
STATUS NAME FILE#
OFFLINE /x1/oradata/db1/undo_tbs_05.dbf 13
OFFLINE /x1/oradata/db1/undo_tbs_06.dbf 14
OFFLINE /x2/oradata/db1/undo_tbs_02.dbf 20
OFFLINE /x2/oradata/db1/undo_tbs_03.dbf 21
OFFLINE /x1/oradata/db1/undo_tbs_04.dbf 22
OFFLINE /x2/oradata/db1/undo_tbs_01.dbf 27
Edited by: SID3 on Mar 21, 2012 4:41 AM