Oracle 手工清除回滚段的几种方法

关于回滚段的问题，之前也小整理过一个，参考：

Current online Redo 和 Undo 损坏的处理方法

http://blog.csdn.net/xujinyang/article/details/6822947

Roger同学昨天整理了一个更加详细的说明，转帖过来。 Roger 的原文链接如下：http://www.killdb.com/?p=196

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dropundo tablespace 也将失败。

可能就会遇到如下的错误：

SQL> drop tablespace undotbs1 includingcontents and datafiles;

drop tablespace undotbs1 including contentsand datafiles

*

ERROR at line 1:

ORA-01561: failed to remove all objects inthe tablespace specified

方法一：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 undotbs2datafile '/oracle/product/oradata/roger/undotbs2.dbf'

2 size 50m autoextend off;

Tablespace created.

SQL> create undo tablespace undotbs3datafile '/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 * fromdba_objects where rownum <10;

Table created.

SQL> delete from ht_01 where rownum<5;

4 rows deleted.

SQL> -----不提交

SQL> selectowner,segment_name,SEGMENT_ID,FILE_ID,BLOCK_ID,STATUS

2 ,tablespace_name from dba_rollback_segs;

OWNERSEGMENT_NAME SEGMENT_ID FILE_IDBLOCK_ID STATUS TABLESPACE_NAME

------ -------------- ---------- -------------------- -------- ---------------

SYSSYSTEM 0 1 9ONLINE SYSTEM

PUBLIC _SYSSMU1$ 1 2 9ONLINE UNDOTBS1

PUBLIC _SYSSMU2$ 2 2 25ONLINE UNDOTBS1

PUBLIC _SYSSMU3$ 3 2 41ONLINE UNDOTBS1

PUBLIC _SYSSMU4$ 4 2 57ONLINE UNDOTBS1

PUBLIC _SYSSMU5$ 5 2 73ONLINE UNDOTBS1

PUBLIC _SYSSMU6$ 6 2 89ONLINE UNDOTBS1

PUBLIC _SYSSMU7$ 7 2105 ONLINEUNDOTBS1

PUBLIC _SYSSMU8$ 8 2 121ONLINE UNDOTBS1

PUBLIC _SYSSMU9$ 9 2 137ONLINE UNDOTBS1

PUBLIC _SYSSMU10$ 10 2 153ONLINE UNDOTBS1

PUBLIC _SYSSMU11$ 11 6 9OFFLINE UNDOTBS2

PUBLIC _SYSSMU12$ 12 6 25OFFLINE UNDOTBS2

PUBLIC _SYSSMU13$ 13 6 41OFFLINE UNDOTBS2

PUBLIC _SYSSMU14$ 14 6 57OFFLINE UNDOTBS2

PUBLIC _SYSSMU15$ 15 6 73OFFLINE UNDOTBS2

PUBLIC _SYSSMU16$ 16 6 89OFFLINE UNDOTBS2

PUBLIC _SYSSMU17$ 17 6 105OFFLINE UNDOTBS2

PUBLIC _SYSSMU18$ 18 6 121OFFLINE UNDOTBS2

PUBLIC _SYSSMU19$ 19 6 137OFFLINE UNDOTBS2

PUBLIC _SYSSMU20$ 20 6 153OFFLINE UNDOTBS2

PUBLIC _SYSSMU21$ 21 79 OFFLINE UNDOTBS3

PUBLIC _SYSSMU22$ 22 7 25OFFLINE UNDOTBS3

PUBLIC _SYSSMU23$ 23 7 41OFFLINE UNDOTBS3

PUBLIC _SYSSMU24$ 24 7 57OFFLINE UNDOTBS3

PUBLIC _SYSSMU25$ 25 7 73OFFLINE UNDOTBS3

PUBLIC _SYSSMU26$ 26 7 89OFFLINE UNDOTBS3

PUBLIC _SYSSMU27$ 27 7 105OFFLINE UNDOTBS3

PUBLIC _SYSSMU28$ 28 7 121OFFLINE UNDOTBS3

PUBLIC _SYSSMU29$ 29 7 137OFFLINE UNDOTBS3

PUBLIC _SYSSMU30$ 30 7 153OFFLINE UNDOTBS3

31 rows selected.

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

XIDUSNXIDSLOT XIDSQN UBABLKUBAFIL UBAREC

---------- ---------- ---------- -------------------- ----------

9 13 299 439 2 47

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

USN NAME

------------------------------------------------------------

9 _SYSSMU9$

--确定当前正在使用的回滚段

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_IDFILE_NAMETABLESPACE_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 setundo_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 includingcontents and datafiles;

drop tablespace undotbs1 including contentsand datafiles

*

ERROR at line 1:

ORA-01548: activerollback 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 booleanTRUE

_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$' isnot online

SQL> drop rollback segment"_SYSSMU9$";

drop rollback segment "_SYSSMU9$"

*

ERROR at line 1:

ORA-01545: rollback segment '_SYSSMU9$'specified not available

SQL> selectowner,segment_name,SEGMENT_ID,FILE_ID,BLOCK_ID,STATUS

2 from dba_rollback_segs wheresegment_name='_SYSSMU9$';

OWNERSEGMENT_NAMESEGMENT_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$)

讲参数添加到pfile里，在启动

SQL> startup mountpfile='/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> selectowner,segment_name,SEGMENT_ID,FILE_ID,BLOCK_ID,STATUS

2 from dba_rollback_segs wheresegment_name='_SYSSMU9$';

OWNERSEGMENT_NAMESEGMENT_ID FILE_ID BLOCK_IDSTATUS

------ -------------------- -------------------- ---------- ----------------

PUBLIC _SYSSMU9$ 9 2 137NEEDS RECOVERY

SQL> drop rollbacksegment "_SYSSMU9$";

Rollback segment dropped.

SQL>

SQL> drop tablespace undotbs1 includingcontents 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。

方法二: 通过更改数据字典表 来删除回滚段和undotablespace

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_01where rownum <2;

1 row deleted.

SQL> ---不提交

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

XIDUSN XIDSLOT XIDSQNUBABLK UBAFIL UBAREC

---------- ---------- ---------- -------------------- ----------

2 5 310345 7 6

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

USNNAME

------------------------------------------------------------

2_SYSSMU2$

SQL> alter system setundo_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 includingcontents and datafiles;

drop tablespace undotbs3 including contentsand datafiles

*

ERROR at line 1:

ORA-01548: active rollback segment'_SYSSMU2$' found, terminate dropping tablespace

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

TS#

----------

7

SQL> select file#,block#,TYPE#,TS# fromseg$ where ts#=7;

FILE# BLOCK# TYPE# TS#

---------- ---------- ---------- ----------

7 9 10 7

7 25 10 7

7 41 10 7

7 57 10 7

7 7310 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> selectowner,segment_name,SEGMENT_ID,FILE_ID,BLOCK_ID,STATUS

2 from dba_rollback_segs wherefile_id=7;

OWNERSEGMENT_NAME SEGMENT_ID FILE_IDBLOCK_ID STATUS

------ ------------- ---------- -------------------- ----------------

PUBLIC _SYSSMU2$ 2 7 281NEEDS RECOVERY

--这里281 不是offline

PUBLIC _SYSSMU21$ 21 7 9OFFLINE

PUBLIC _SYSSMU22$ 227 25OFFLINE

PUBLIC _SYSSMU23$ 23 7 41OFFLINE

PUBLIC _SYSSMU24$ 24 7 57OFFLINE

PUBLIC _SYSSMU25$ 25 7 73OFFLINE

PUBLIC _SYSSMU26$ 26 789 OFFLINE

PUBLIC _SYSSMU27$ 27 7 105OFFLINE

PUBLIC _SYSSMU28$ 28 7 121OFFLINE

PUBLIC _SYSSMU29$ 29 7 137OFFLINE

PUBLIC _SYSSMU30$ 30 7 153OFFLINE

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# fromundo$ 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$ 757

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 andfile#=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 includingcontents and datafiles;

drop tablespace undotbs3 including contentsand datafiles

*

ERROR at line 1:

ORA-01561: failed to remove all objects inthe 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 wherets#=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 includingcontents 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 includingcontents and datafiles;

drop tablespace undotbs2 including contentsand datafiles

*

ERROR at line 1:

ORA-00600: internal error code, arguments:[ktssdrp1], [5], [6], [25], [], [], [], []

方法三： 使用bbed 修改元数据

SQL> purge recyclebin;

Recyclebin purged.

SQL> create table ht01 as selectowner,object_name,object_id

2 from dba_objects whereobject_id <100;

Table created.

SQL> select count(*) from ht01;

COUNT(*)

----------

98

SQL> delete from ht01where 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 stringUNDOTBS4

SQL> selectowner,segment_name,SEGMENT_ID,FILE_ID,BLOCK_ID,STATUS

2 from dba_rollback_segs wheretablespace_name='UNDOTBS4';

OWNERSEGMENT_NAME SEGMENT_ID FILE_IDBLOCK_ID STATUS

------ ------------- ---------- -------------------- ----------------

PUBLIC _SYSSMU1$ 1 2 169ONLINE

PUBLIC _SYSSMU2$ 2 2 185ONLINE

PUBLIC _SYSSMU3$ 3 2 9OFFLINE

PUBLIC _SYSSMU4$ 4 225 OFFLINE

PUBLIC _SYSSMU5$ 5 2 41OFFLINE

PUBLIC _SYSSMU6$ 6 2 57OFFLINE

PUBLIC _SYSSMU7$ 7 2 73OFFLINE

PUBLIC _SYSSMU8$ 8 2 89OFFLINE

PUBLIC _SYSSMU10$ 10 2 105OFFLINE

PUBLIC _SYSSMU11$ 11 2 121OFFLINE

PUBLIC _SYSSMU12$ 12 2 137OFFLINE

PUBLIC _SYSSMU31$ 31 2153 OFFLINE

12 rows selected.

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

XIDUSN XIDSLOT XIDSQNUBABLK UBAFIL UBAREC

---------- ---------- ---------- -------------------- ----------

2 93 191 2 10

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

USN NAME

------------------------------------------------------------

2 _SYSSMU2$

SQL> select file_id,file_name,statusfrom 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 setundo_tablespace=undotbs5;

System altered.

SQL> alter database datafile 2 offline;

Database altered.

SQL>

SQL> selectowner,SEGMENT_NAME,SEGMENT_TYPE,HEADER_FILE,HEADER_BLOCK

2 from dba_segments wheresegment_name='_SYSSMU2$';

OWNERSEGMENT_NAMESEGMENT_TYPE HEADER_FILEHEADER_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 wherefile#=2 and block#=185;

1 row updated.

SQL> commit;

Commit complete.

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

US# NAMEFILE# BLOCK# STATUS$

---------- ---------------- ---------- ---------- ----------

0 SYSTEM1 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$ 6137 2

20 _SYSSMU20$6 153 2

21 _SYSSMU21$6 9 3

22 _SYSSMU22$6 25 3

23 _SYSSMU23$6 413

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> selectdbms_rowid.rowid_relative_fno(rowid) file#,dbms_rowid.rowid_block_number(rowid)blk#

2 from undo$ where file#=2 andblock#=185;

FILE# BLK#

---------- ----------

1 106

SQL>

BBED> set file 1 block106

FILE# 1

BLOCK# 106

BBED> p kdbr

sb2 kdbr[0] @86 8079

sb2 kdbr[1] @88 5234

sb2 kdbr[2] @904754

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] @1167255

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] @1425454

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

col0[2] @4825: 2

col1[9] @4828: -0

col2[2] @4838: 1

col3[2] @4841: 2

col4[3] @4844: 185

col5[1] @4848: 0

col6[1] @4850: 0

col7[1] @4852: 0

col8[1] @4854: 0

col9[1] @4856: 0

col10[2] @4858: 4

col11[2] @4861: 8

col12[0] @4864: *NULL*

col13[0] @4865: *NULL*

col14[0] @4866: *NULL*

col15[0] @4867: *NULL*

col16[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 200a5f535953534d 55333124 02c10202

c10303c2 023604c3 53491901 8002c103 02c102018002c103 02c109ff ffffff02

c1022c00 1102c10d 0a5f5359 53534d55 31322402c10202c1 0303c202 2604c353

49250180 02c10302 c1020180 02c10302 c109ffffffff02c1 022c0011 02c1200a

5f535953 534d5533 312402c1 0202c103 03c2023601800180 01800180 018002c1

0402c109 ffffffff 02c1022c 001102c1 0d0a5f535953534d 55313224 02c10202

c10303c2 02260180 01800180 01800180 02c10402c109ffff ffff02c1 022c0011

02c10c0a 5f535953 534d5531 312402c1 0202c10303c20216 04c35349 1b018002

c10802c1 04018002 c10302c1 09ffffff ff02c1022c001102 c109095f 53595353

4d553824 02c10202 c10302c1 5a04c353 491d018003c20345 03c2033e 018002c1

0302c109 ffffffff 02c1022c 001102c1 08095f535953534d 55372402 c10202c1

0302c14a 04c35349 27018003 c2036403 c2052801 8002c10302c109ff ffffff02

c1023c01 1102c103 095f5359 53534d55 322402c10202c108 03c20352 04c34a3a

1b018003 c2036403 c2031601 8002c106 02c108ffffffff02 c1022c00 1102c102

095f5359 53534d55 312402c1 0202c103 03c2024604c35351 51018003 c2033003

c2035101 8002c103 02c109ff ffffff02 c1022c011102c116 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.

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

US# NAMEFILE# 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 rollbacksegment "_SYSSMU2$";

Rollback segment dropped.

SQL> ---成功drop回滚段。

SQL> conn roger/roger

Connected.

SQL> select count(*) from ht01;

COUNT(*)

----------

90