手工清除回滚段的几种方法

huanhuanlove · 发表于 2011-7-30 10:46

原文链接：http://www.killdb.com/?p=196

在某些情况下，我们需要手动去清除一些有问题的回滚段，如果该回滚段中
包含活动事务，那么使用正常的方式将无法drop，所以此时你drop undo tablespace 也将失败。
可能就会遇到如下的错误：
SQL> drop tablespace undotbs1 including contents and datafiles;
drop tablespace undotbs1 including contents and datafiles
*
ERROR at line 1:
ORA-01561: failed to remove all objects in the tablespace specified

下面介绍几种方法：

####### 方法1  用隐含参数
SQL> show parameter undo

NAME                               TYPE       VALUE
------------------------------------ ----------- ------------------------------
undo_management                   string    AUTO
undo_retention                      integer    900
undo_tablespace                   string    UNDOTBS1

SQL> create undo tablespace undotbs2 datafile '/oracle/product/oradata/roger/undotbs2.dbf'
  2  size 50m autoextend off;

Tablespace created.

SQL> create undo tablespace undotbs3 datafile '/oracle/product/oradata/roger/undotbs3.dbf'
  2  size 50m autoextend off;

Tablespace created.

SQL>
SQL> conn roger/roger
Connected.
SQL> create table ht_01 as select * from dba_objects where rownum <10;

Table created.

SQL> delete from ht_01 where rownum <5;

4 rows deleted.

SQL> -----不提交

SQL> select owner,segment_name,SEGMENT_ID,FILE_ID,BLOCK_ID,STATUS
  2  ,tablespace_name from dba_rollback_segs;

OWNER  SEGMENT_NAME SEGMENT_ID FILE_ID BLOCK_ID  STATUS TABLESPACE_NAME
------ -------------- ---------- ---------- ----------  -------- ---------------
SYS SYSTEM                0       1       9  ONLINE SYSTEM
PUBLIC _SYSSMU1$             1       2       9  ONLINE UNDOTBS1
PUBLIC _SYSSMU2$             2       2       25  ONLINE UNDOTBS1
PUBLIC _SYSSMU3$             3       2       41  ONLINE UNDOTBS1
PUBLIC _SYSSMU4$             4       2       57  ONLINE UNDOTBS1
PUBLIC _SYSSMU5$             5       2       73  ONLINE UNDOTBS1
PUBLIC _SYSSMU6$             6       2       89  ONLINE UNDOTBS1
PUBLIC _SYSSMU7$             7       2       105  ONLINE UNDOTBS1
PUBLIC _SYSSMU8$             8       2       121  ONLINE UNDOTBS1
PUBLIC _SYSSMU9$             9       2       137  ONLINE UNDOTBS1
PUBLIC _SYSSMU10$          10       2       153  ONLINE UNDOTBS1
PUBLIC _SYSSMU11$          11       6       9  OFFLINE  UNDOTBS2
PUBLIC _SYSSMU12$          12       6       25  OFFLINE  UNDOTBS2
PUBLIC _SYSSMU13$          13       6       41  OFFLINE  UNDOTBS2
PUBLIC _SYSSMU14$          14       6       57  OFFLINE  UNDOTBS2
PUBLIC _SYSSMU15$          15       6       73  OFFLINE  UNDOTBS2
PUBLIC _SYSSMU16$          16       6       89  OFFLINE  UNDOTBS2
PUBLIC _SYSSMU17$          17       6       105  OFFLINE  UNDOTBS2
PUBLIC _SYSSMU18$          18       6       121  OFFLINE  UNDOTBS2
PUBLIC _SYSSMU19$          19       6       137  OFFLINE  UNDOTBS2
PUBLIC _SYSSMU20$          20       6       153  OFFLINE  UNDOTBS2
PUBLIC _SYSSMU21$          21       7       9  OFFLINE  UNDOTBS3
PUBLIC _SYSSMU22$          22       7       25  OFFLINE  UNDOTBS3
PUBLIC _SYSSMU23$          23       7       41  OFFLINE  UNDOTBS3
PUBLIC _SYSSMU24$          24       7       57  OFFLINE  UNDOTBS3
PUBLIC _SYSSMU25$          25       7       73  OFFLINE  UNDOTBS3
PUBLIC _SYSSMU26$          26       7       89  OFFLINE  UNDOTBS3
PUBLIC _SYSSMU27$          27       7       105  OFFLINE  UNDOTBS3
PUBLIC _SYSSMU28$          28       7       121  OFFLINE  UNDOTBS3
PUBLIC _SYSSMU29$          29       7       137  OFFLINE  UNDOTBS3
PUBLIC _SYSSMU30$          30       7       153  OFFLINE  UNDOTBS3

31 rows selected.

SQL> select xidusn,xidslot,xidsqn,ubablk,ubafil,ubarec from v$transaction;

XIDUSN XIDSLOT    XIDSQN    UBABLK    UBAFIL    UBAREC
---------- ---------- ---------- ---------- ---------- ----------
      9       13       299       439       2       47

SQL> select usn,name from v$rollname where usn=9;

   USN NAME
---------- --------------------------------------------------
      9 _SYSSMU9$

SQL>

SQL> c/file_name/file_name,tablespace_name
  1* select file_id,file_name,tablespace_name from dba_data_files order by 1
SQL> /

FILE_ID FILE_NAME                                     TABLESPACE_NAME
---------- ----------------------------------------------- ---------------
      1 /oracle/product/oradata/roger/system01.dbf    SYSTEM
      2 /oracle/product/oradata/roger/undotbs01.dbf    UNDOTBS1
      3 /oracle/product/oradata/roger/sysaux01.dbf    SYSAUX
      4 /oracle/product/oradata/roger/users01.dbf    USERS
      5 /oracle/product/oradata/roger/roger01.dbf    ROGER
      6 /oracle/product/oradata/roger/undotbs2.dbf    UNDOTBS2
      7 /oracle/product/oradata/roger/undotbs3.dbf    UNDOTBS3

7 rows selected.

SQL>
SQL> show parameter undo

NAME                               TYPE       VALUE
------------------------------------ ----------- -------------------
undo_management                   string    AUTO
undo_retention                      integer    900
undo_tablespace                   string    UNDOTBS1
SQL> alter system set undo_tablespace=undotbs2;

System altered.

SQL> alter database datafile 2 offline;

Database altered.

SQL>
SQL> shutdown abort;
ORACLE instance shut down.
SQL>
SQL>
SQL> startup
ORACLE instance started.

Total System Global Area  167772160 bytes
Fixed Size                1266392 bytes
Variable Size          104860968 bytes
Database Buffers          58720256 bytes
Redo Buffers             2924544 bytes
Database mounted.
Database opened.
SQL> drop tablespace undotbs1 including contents and datafiles;
drop tablespace undotbs1 including contents and datafiles
*
ERROR at line 1:
ORA-01548: active rollback segment '_SYSSMU9$' found, terminate dropping tablespace

SQL>  ---我们看到报错了意思是说该回滚段中还有活动事务

SQL> conn roger/roger
Connected.
SQL> show parameter undo

NAME                               TYPE       VALUE
------------------------------------ ----------- ------------------------------
_collect_undo_stats                boolean    TRUE
_gc_dissolve_undo_affinity          boolean    FALSE
_gc_initiate_undo_affinity          boolean    TRUE
_gc_undo_affinity                   boolean    TRUE
_gc_undo_affinity_locks             boolean    TRUE
_in_memory_undo                   boolean    TRUE
_kcl_undo_grouping                integer    32
_kcl_undo_locks                   integer    128
_optimizer_undo_changes             boolean    FALSE
_optimizer_undo_cost_change       string    10.2.0.4
_smon_undo_seg_rescan_limit       integer    10
_undo_autotune                      boolean    TRUE
_undo_debug_mode                   integer    0
_undo_debug_usage                   integer    0
_verify_undo_quota                boolean    FALSE
undo_management                   string    AUTO
undo_retention                      integer    900
undo_tablespace                   string    UNDOTBS2
SQL>
SQL> alter system set "_smu_debug_mode" = 4;

System altered.

SQL> alter rollback segment "_SYSSMU9$" offline;
alter rollback segment "_SYSSMU9$" offline
*
ERROR at line 1:
ORA-01598: rollback segment '_SYSSMU9$' is not online

SQL> drop rollback segment "_SYSSMU9$";
drop rollback segment "_SYSSMU9$"
*
ERROR at line 1:
ORA-01545: rollback segment '_SYSSMU9$' specified not available

SQL> select owner,segment_name,SEGMENT_ID,FILE_ID,BLOCK_ID,STATUS
  2  from dba_rollback_segs where segment_name='_SYSSMU9$';

OWNER  SEGMENT_NAME       SEGMENT_ID FILE_ID BLOCK_ID STATUS
------ -------------------- ---------- ---------- ---------- ----------------
PUBLIC _SYSSMU9$                   9       2       137 NEEDS RECOVERY

SQL>
用如下隐含参数：
_offline_rollback_segments=(_SYSSMU9$)
_corrupted_rollback_segments=(_SYSSMU9$)

SQL> startup mount pfile='/oracle/pfile.ora';
ORACLE instance started.

Total System Global Area  167772160 bytes
Fixed Size                1266392 bytes
Variable Size          104860968 bytes
Database Buffers          58720256 bytes
Redo Buffers             2924544 bytes
Database mounted.
SQL> alter database open;

Database altered.

SQL> select owner,segment_name,SEGMENT_ID,FILE_ID,BLOCK_ID,STATUS
  2  from dba_rollback_segs where segment_name='_SYSSMU9$';

OWNER  SEGMENT_NAME       SEGMENT_ID FILE_ID BLOCK_ID  STATUS
------ -------------------- ---------- ---------- ----------  ----------------
PUBLIC _SYSSMU9$                   9       2       137  NEEDS RECOVERY

SQL> drop rollback segment "_SYSSMU9$";

Rollback segment dropped.

SQL>
SQL> drop tablespace undotbs1 including contents and datafiles;

Tablespace dropped.

SQL>
SQL> select count(*) from ht_01;

  COUNT(*)
----------
      5 ---数据丢失

这里可能有人会问上面的_undo_debug_mode参数为啥不管用？其实不是没效果，
是针对这种情况下，没用而已，对于自动undo管理模式，可以使用该参数来手工
删除某个回滚段，前提是该回滚段无活动事务。

huanhuanlove · 发表于 2011-7-30 10:46

######## 方法2  通过更改数据字典表来删除回滚段和undo tablespace
SQL> show parameter undo

NAME                               TYPE       VALUE
------------------------------------ ----------- ------------------------------
undo_management                   string    AUTO
undo_retention                      integer    900
undo_tablespace                   string    UNDOTBS3
SQL> conn roger/roger
Connected.
SQL> select count(*) from ht_01;

  COUNT(*)
----------
      3

SQL> delete from ht_01 where rownum <2;

1 row deleted.

SQL> ---不提交

SQL> select xidusn,xidslot,xidsqn,ubablk,ubafil,ubarec from v$transaction;

XIDUSN XIDSLOT    XIDSQN    UBABLK    UBAFIL    UBAREC
---------- ---------- ---------- ---------- ---------- ----------
      2       5       310       345       7       6

SQL> select usn,name from v$rollname where usn=2;

   USN NAME
---------- --------------------------------------------------
      2 _SYSSMU2$

SQL> alter system set undo_tablespace=undotbs4;

System altered.

SQL> alter database datafile 7 offline;

Database altered.

SQL>
SQL> shutdown abort;
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  167772160 bytes
Fixed Size                1266392 bytes
Variable Size          104860968 bytes
Database Buffers          58720256 bytes
Redo Buffers             2924544 bytes
Database mounted.
Database opened.
SQL> drop tablespace undotbs3 including contents and datafiles;
drop tablespace undotbs3 including contents and datafiles
*
ERROR at line 1:
ORA-01548: active rollback segment '_SYSSMU2$' found, terminate dropping tablespace

SQL> select ts# from ts$ where name='UNDOTBS3';

   TS#
----------
      7
SQL> select file#,block#,TYPE#,TS# from seg$ where ts#=7;

   FILE#    BLOCK#    TYPE#       TS#
---------- ---------- ---------- ----------
      7       9       10       7
      7       25       10       7
      7       41       10       7
      7       57       10       7
      7       73       10       7
      7       89       10       7
      7       105       10       7
      7       121       10       7
      7       137       10       7
      7       153       10       7
      7       265       3       7
      7       281       10       7

12 rows selected.

SQL> select owner,segment_name,SEGMENT_ID,FILE_ID,BLOCK_ID,STATUS
  2  from dba_rollback_segs where file_id=7;

OWNER  SEGMENT_NAME  SEGMENT_ID FILE_ID BLOCK_ID  STATUS
------ ------------- ---------- ---------- ----------  ----------------
PUBLIC _SYSSMU2$             2       7       281  NEEDS RECOVERY
PUBLIC _SYSSMU21$          21       7       9  OFFLINE
PUBLIC _SYSSMU22$          22       7       25  OFFLINE
PUBLIC _SYSSMU23$          23       7       41  OFFLINE
PUBLIC _SYSSMU24$          24       7       57  OFFLINE
PUBLIC _SYSSMU25$          25       7       73  OFFLINE
PUBLIC _SYSSMU26$          26       7       89  OFFLINE
PUBLIC _SYSSMU27$          27       7       105  OFFLINE
PUBLIC _SYSSMU28$          28       7       121  OFFLINE
PUBLIC _SYSSMU29$          29       7       137  OFFLINE
PUBLIC _SYSSMU30$          30       7       153  OFFLINE

11 rows selected.

SQL>
SQL> update seg$ set type# = 3 where ts#=7 and file#=7 and BLOCK#=281;

1 row updated.

SQL> commit;

Commit complete.

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  167772160 bytes
Fixed Size                1266392 bytes
Variable Size          104860968 bytes
Database Buffers          58720256 bytes
Redo Buffers             2924544 bytes
Database mounted.
Database opened.
SQL> select US# ,NAME,FILE#,BLOCK# from undo$ where file#=7;

   US# NAME             FILE#    BLOCK#
---------- ---------------  ------- ----------
      1 _SYSSMU1$             7       265
      2 _SYSSMU2$             7       281
      21 _SYSSMU21$          7       9
      22 _SYSSMU22$          7       25
      23 _SYSSMU23$          7       41
      24 _SYSSMU24$          7       57
      25 _SYSSMU25$          7       73
      26 _SYSSMU26$          7       89
      27 _SYSSMU27$          7       105
      28 _SYSSMU28$          7       121
      29 _SYSSMU29$          7       137
      30 _SYSSMU30$          7       153

12 rows selected.

SQL>
SQL> delete from undo$ where ts#=7 and US#=2;

1 row deleted.

SQL> delete from seg$ where ts#=7 and file#=7 and block#=281;

1 row deleted.

SQL>
SQL> commit;

Commit complete.

SQL> drop rollback segment "_SYSSMU2$";
drop rollback segment "_SYSSMU2$"
*
ERROR at line 1:
ORA-01545: rollback segment '_SYSSMU2$' specified not available

由于我们已经从几个数据字典表中将该段清除了，所以需要用包检查下
SQL> execute hcheck.full

PL/SQL procedure successfully completed.

SQL> drop rollback segment "_SYSSMU2$";

Rollback segment dropped.

SQL>
SQL> drop tablespace undotbs3 including contents and datafiles;
drop tablespace undotbs3 including contents and datafiles
*
ERROR at line 1:
ORA-01561: failed to remove all objects in the tablespace specified

对于该错误，处理起来就非常容易了，如下：

SQL> update seg$ set type# = 3 where ts#=7;

11 rows updated.

SQL> commit;

Commit complete.

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  167772160 bytes
Fixed Size                1266392 bytes
Variable Size          104860968 bytes
Database Buffers          58720256 bytes
Redo Buffers             2924544 bytes
Database mounted.
Database opened.
SQL> drop tablespace undotbs3 including contents and datafiles;

Tablespace dropped.

SQL> ----Drop Tablespace 成功

简单的总结下，其实我们只要通过如下步骤就能轻易的删除：
1.  将回滚段更改为临时段
2.  重启实例
3.  从seg$中删除记录
4.  从undo$中删除记录

需要注意一下的是，如果不使用hcheck.full  那么直接drop tablespace可能遇到如下错误：
SQL> drop tablespace undotbs2 including contents and datafiles;
drop tablespace undotbs2 including contents and datafiles
*
ERROR at line 1:
ORA-00600: internal error code, arguments: [ktssdrp1], [5], [6], [25], [], [], [], []

########## 方法3 使用bbed 修改元数据
SQL> purge recyclebin;

Recyclebin purged.

SQL> create table ht01 as select owner,object_name,object_id
  2  from dba_objects where object_id <100;

Table created.

SQL> select count(*) from ht01;

  COUNT(*)
----------
      98

SQL> delete from ht01 where object_id <10;

8 rows deleted.
SQL> ----不提交
SQL> show parameter undo

NAME                               TYPE       VALUE
------------------------------------ ----------- ------------------------------
undo_management                   string    AUTO
undo_retention                      integer    900
undo_tablespace                   string    UNDOTBS4
SQL> select owner,segment_name,SEGMENT_ID,FILE_ID,BLOCK_ID,STATUS
  2  from dba_rollback_segs where tablespace_name='UNDOTBS4';

OWNER  SEGMENT_NAME  SEGMENT_ID FILE_ID BLOCK_ID  STATUS
------ ------------- ---------- ---------- ----------  ----------------
PUBLIC _SYSSMU1$             1       2       169  ONLINE
PUBLIC _SYSSMU2$             2       2       185  ONLINE
PUBLIC _SYSSMU3$             3       2       9  OFFLINE
PUBLIC _SYSSMU4$             4       2       25  OFFLINE
PUBLIC _SYSSMU5$             5       2       41  OFFLINE
PUBLIC _SYSSMU6$             6       2       57  OFFLINE
PUBLIC _SYSSMU7$             7       2       73  OFFLINE
PUBLIC _SYSSMU8$             8       2       89  OFFLINE
PUBLIC _SYSSMU10$          10       2       105  OFFLINE
PUBLIC _SYSSMU11$          11       2       121  OFFLINE
PUBLIC _SYSSMU12$          12       2       137  OFFLINE
PUBLIC _SYSSMU31$          31       2       153  OFFLINE

12 rows selected.

SQL> select xidusn,xidslot,xidsqn,ubablk,ubafil,ubarec from v$transaction;

XIDUSN XIDSLOT    XIDSQN    UBABLK    UBAFIL    UBAREC
---------- ---------- ---------- ---------- ---------- ----------
      2       9       3       191       2       10

SQL> select usn,name from v$rollname where usn=2;

   USN NAME
---------- --------------------------------------------------
      2 _SYSSMU2$

huanhuanlove · 发表于 2011-7-30 10:47

SQL> select file_id,file_name,status from dba_data_files order by 1;

FILE_ID FILE_NAME                                     STATUS
---------- ----------------------------------------------- ---------
      1 /oracle/product/oradata/roger/system01.dbf    AVAILABLE
      2 /oracle/product/oradata/roger/undotbs4.dbf    AVAILABLE
      3 /oracle/product/oradata/roger/sysaux01.dbf    AVAILABLE
      4 /oracle/product/oradata/roger/users01.dbf    AVAILABLE
      5 /oracle/product/oradata/roger/roger01.dbf    AVAILABLE
      6 /oracle/product/oradata/roger/undotbs5.dbf    AVAILABLE

6 rows selected.

SQL> alter system set undo_tablespace=undotbs5;

System altered.

SQL> alter database datafile 2 offline;

Database altered.

SQL>
SQL> select owner,SEGMENT_NAME,SEGMENT_TYPE,HEADER_FILE,HEADER_BLOCK
  2  from dba_segments where segment_name='_SYSSMU2$';

OWNER    SEGMENT_NAME       SEGMENT_TYPE    HEADER_FILE HEADER_BLOCK
----------- -------------------- ------------------ ----------- ------------
SYS       _SYSSMU2$          TYPE2 UNDO                2       185

SQL>

单纯的通过修改undo$的status$字典是无法drop的，如下：
SQL> update undo$ set STATUS$=4 where file#=2 and block#=185;

1 row updated.

SQL> commit;

Commit complete.

SQL> select US#,NAME,FILE# ,BLOCK# ,STATUS$ from undo$;

   US# NAME                FILE#    BLOCK# STATUS$
---------- ----------------  ---------- ---------- ----------
      0 SYSTEM                   1       9       3
      1 _SYSSMU1$                2       169       2
      2 _SYSSMU2$                2       185       4
      3 _SYSSMU3$                2       9       2
      4 _SYSSMU4$                2       25       2
      5 _SYSSMU5$                2       41       2
      6 _SYSSMU6$                2       57       2
      7 _SYSSMU7$                2       73       2
      8 _SYSSMU8$                2       89       2
      9 _SYSSMU9$                2       137       1
      10 _SYSSMU10$                2       105       2
      11 _SYSSMU11$                2       121       2
      12 _SYSSMU12$                2       137       2
      13 _SYSSMU13$                6       41       2
      14 _SYSSMU14$                6       57       2
      15 _SYSSMU15$                6       73       2
      16 _SYSSMU16$                6       89       2
      17 _SYSSMU17$                6       105       2
      18 _SYSSMU18$                6       121       2
      19 _SYSSMU19$                6       137       2
      20 _SYSSMU20$                6       153       2
      21 _SYSSMU21$                6       9       3
      22 _SYSSMU22$                6       25       3
      23 _SYSSMU23$                6       41       3
      24 _SYSSMU24$                6       57       3
      25 _SYSSMU25$                6       73       3
      26 _SYSSMU26$                6       89       3
      27 _SYSSMU27$                6       105       3
      28 _SYSSMU28$                6       121       3
      29 _SYSSMU29$                6       137       3
      30 _SYSSMU30$                6       153       3
      31 _SYSSMU31$                2       153       2

32 rows selected.
SQL>
SQL> drop rollback segment "_SYSSMU2$";
drop rollback segment "_SYSSMU2$"
*
ERROR at line 1:
ORA-01545: rollback segment '_SYSSMU2$' specified not available

SQL> alter system set "_smu_debug_mode" = 4;

System altered.

SQL> drop rollback segment "_SYSSMU2$";
drop rollback segment "_SYSSMU2$"
*
ERROR at line 1:
ORA-01545: rollback segment '_SYSSMU2$' specified not available

下面我们通过bbed来修改元数据，也就是直接修改回滚段的状态，将其修改为offline。

SQL> select dbms_rowid.rowid_relative_fno(rowid) file#,dbms_rowid.rowid_block_number(rowid) blk#
  2  from undo$ where file#=2 and block#=185;

   FILE#    BLK#
---------- ----------
      1       106

SQL>
BBED> set file 1 block 106
      FILE#          1
      BLOCK#       106
BBED> p kdbr
sb2 kdbr[0]                               @86    8079
sb2 kdbr[1]                               @88    5234
sb2 kdbr[2]                               @90    4754
sb2 kdbr[3]                               @92    6654
sb2 kdbr[4]                               @94    7860
sb2 kdbr[5]                               @96    7805
sb2 kdbr[6]                               @98    6818
sb2 kdbr[7]                               @100    5123
sb2 kdbr[8]                               @102    5068
sb2 kdbr[9]                               @104    5940
sb2 kdbr[10]                               @106    7525
sb2 kdbr[11]                               @108    5013
sb2 kdbr[12]                               @110    4858
sb2 kdbr[13]                               @112    6053
sb2 kdbr[14]                               @114    7309
sb2 kdbr[15]                               @116    7255
sb2 kdbr[16]                               @118    7201
sb2 kdbr[17]                               @120    7146
sb2 kdbr[18]                               @122    7091
sb2 kdbr[19]                               @124    5885
sb2 kdbr[20]                               @126    6981
sb2 kdbr[21]                               @128    5290
sb2 kdbr[22]                               @130    5780
sb2 kdbr[23]                               @132    5726
sb2 kdbr[24]                               @134    5672
sb2 kdbr[25]                               @136    5618
sb2 kdbr[26]                               @138    5564
sb2 kdbr[27]                               @140    5509
sb2 kdbr[28]                               @142    5454
sb2 kdbr[29]                               @144    5399
sb2 kdbr[30]                               @146    5344
sb2 kdbr[31]                               @148    4803

BBED> p *kdbr[2]
rowdata[0]
----------
ub1 rowdata[0]                            @4822    0x2c

BBED>
BBED>
BBED> x /1rnnnnnnnnnnnnnn
rowdata[0]                               @4822
----------
flag@4822: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@4823: 0x00
cols@4824: 17

col 0[2] @4825: 2
col 1[9] @4828: -0
col 2[2] @4838: 1
col 3[2] @4841: 2
col 4[3] @4844: 185
col 5[1] @4848: 0
col 6[1] @4850: 0
col 7[1] @4852: 0
col 8[1] @4854: 0
col 9[1] @4856: 0
col 10[2] @4858: 4
col 11[2] @4861: 8
col 12[0] @4864: *NULL*
col 13[0] @4865: *NULL*
col 14[0] @4866: *NULL*
col 15[0] @4867: *NULL*
col 16[2] @4868: 1

BBED> modify /x 02 offset 4860
File: /oracle/product/oradata/roger/system01.dbf (1)
Block: 106             Offsets: 4860 to 5371          Dba:0x0040006a
------------------------------------------------------------------------
0202c109 ffffffff 02c1022c 001102c1 200a5f53 5953534d 55333124 02c10202
c10303c2 023604c3 53491901 8002c103 02c10201 8002c103 02c109ff ffffff02
c1022c00 1102c10d 0a5f5359 53534d55 31322402 c10202c1 0303c202 2604c353
49250180 02c10302 c1020180 02c10302 c109ffff ffff02c1 022c0011 02c1200a
5f535953 534d5533 312402c1 0202c103 03c20236 01800180 01800180 018002c1
0402c109 ffffffff 02c1022c 001102c1 0d0a5f53 5953534d 55313224 02c10202
c10303c2 02260180 01800180 01800180 02c10402 c109ffff ffff02c1 022c0011
02c10c0a 5f535953 534d5531 312402c1 0202c103 03c20216 04c35349 1b018002
c10802c1 04018002 c10302c1 09ffffff ff02c102 2c001102 c109095f 53595353
4d553824 02c10202 c10302c1 5a04c353 491d0180 03c20345 03c2033e 018002c1
0302c109 ffffffff 02c1022c 001102c1 08095f53 5953534d 55372402 c10202c1
0302c14a 04c35349 27018003 c2036403 c2052801 8002c103 02c109ff ffffff02
c1023c01 1102c103 095f5359 53534d55 322402c1 0202c108 03c20352 04c34a3a
1b018003 c2036403 c2031601 8002c106 02c108ff ffffff02 c1022c00 1102c102
095f5359 53534d55 312402c1 0202c103 03c20246 04c35351 51018003 c2033003
c2035101 8002c103 02c109ff ffffff02 c1022c01 1102c116 0a5f5359 53534d55

<32 bytes per line>

BBED> sum apply
Check value for File 1, Block 106:
current = 0x32cb, required = 0x32cb

BBED> verify
DBVERIFY - Verification starting
FILE = /oracle/product/oradata/roger/system01.dbf
BLOCK = 106

DBVERIFY - Verification complete

Total Blocks Examined       : 1
Total Blocks Processed (Data) : 1
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty          : 0
Total Blocks Marked Corrupt : 0
Total Blocks Influx          : 0

BBED>
SQL> startup
ORACLE instance started.

Total System Global Area  167772160 bytes
Fixed Size                1266392 bytes
Variable Size          104860968 bytes
Database Buffers          58720256 bytes
Redo Buffers             2924544 bytes
Database mounted.
Database opened.

huanhuanlove · 发表于 2011-7-30 10:47

SQL> select US#,NAME,FILE# ,BLOCK# ,STATUS$ from undo$ where file#=2;

   US# NAME                   FILE#    BLOCK# STATUS$
---------- ------------------ ---------- ---------- ----------
      1 _SYSSMU1$                2       169       2
      2 _SYSSMU2$                2       185       1
      3 _SYSSMU3$                2       9       2
      4 _SYSSMU4$                2       25       2
      5 _SYSSMU5$                2       41       2
      6 _SYSSMU6$                2       57       2
      7 _SYSSMU7$                2       73       2
      8 _SYSSMU8$                2       89       2
      9 _SYSSMU9$                2       137       1
      10 _SYSSMU10$                2       105       2
      11 _SYSSMU11$                2       121       2
      12 _SYSSMU12$                2       137       2
      31 _SYSSMU31$                2       153       2

13 rows selected.

SQL> drop rollback segment "_SYSSMU2$";

Rollback segment dropped.

SQL> ---成功drop回滚段。
SQL> conn roger/roger
Connected.
SQL> select count(*) from ht01;

  COUNT(*)
----------
      90