用BBED修復tailchk錯誤導致的壞塊：
<<<檢查alert日誌，發現96033損壞
SYS@ora11g> select * from songyb;
select * from songyb
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 1, block # 96033)
ORA-01110: data file 1: '/u01/app/oracle/oradata/ora11g/system01.dbf'
SYS@ora11g>
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/ora11g/system01.dbf
BLOCK = 96033
Block 96033 is corrupt
Corrupt block relative dba: 0x00417721 (file 0, block 96033)
Fractured block found during verification
Data in bad block:
type: 6 format: 2 rdba: 0x00417721
last change scn: 0x0000.40032d33 seq: 0x5 flg: 0x06
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x2d330662 <<< tailchk bas_kcbh(後4位)+type_kcbh+seq_kcbh 因此應該爲：0x2d330605，修改即可。
check value in block header: 0x5906
computed block checksum: 0x0
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 1
Total Blocks Influx : 2
Message 531 not found; product=RDBMS; facility=BBED
BBED> find /c songyb
File: /u01/app/oracle/oradata/ora11g/system01.dbf (1)
Block: 96033 Offsets: 8183 to 8191 Dba:0x00417721
------------------------------------------------------------------------
736f6e67 79620633 2d
<32 bytes per line>
BBED> map /v
File: /u01/app/oracle/oradata/ora11g/system01.dbf (1)
Block: 96033 Dba:0x00417721
------------------------------------------------------------
KTB Data Block (Table/Cluster)
struct kcbh, 20 bytes @0
ub1 type_kcbh @0
ub1 frmt_kcbh @1
ub1 spare1_kcbh @2
ub1 spare2_kcbh @3
ub4 rdba_kcbh @4
ub4 bas_kcbh @8
ub2 wrp_kcbh @12
ub1 seq_kcbh @14
ub1 flg_kcbh @15
ub2 chkval_kcbh @16
ub2 spare3_kcbh @18
struct ktbbh, 72 bytes @20
ub1 ktbbhtyp @20
union ktbbhsid, 4 bytes @24
struct ktbbhcsc, 8 bytes @28
sb2 ktbbhict @36
ub1 ktbbhflg @38
ub1 ktbbhfsl @39
ub4 ktbbhfnx @40
struct ktbbhitl[2], 48 bytes @44
struct kdbh, 14 bytes @92
ub1 kdbhflag @92
sb1 kdbhntab @93
sb2 kdbhnrow @94
sb2 kdbhfrre @96
sb2 kdbhfsbo @98
sb2 kdbhfseo @100
sb2 kdbhavsp @102
sb2 kdbhtosp @104
struct kdbt[1], 4 bytes @106
sb2 kdbtoffs @106
sb2 kdbtnrow @108
sb2 kdbr[1] @110
ub1 freespace[8067] @112
ub1 rowdata[9] @8179
ub4 tailchk @8188
BBED> d /v offset 8188
File: /u01/app/oracle/oradata/ora11g/system01.dbf (1)
Block: 96033 Offsets: 8188 to 8191 Dba:0x00417721
-------------------------------------------------------
6206332d l b.3-
<16 bytes per line>
BBED> modify /x 05 offset 8188
File: /u01/app/oracle/oradata/ora11g/system01.dbf (1)
Block: 96033 Offsets: 8188 to 8191 Dba:0x00417721
------------------------------------------------------------------------
0506332d
<32 bytes per line>
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/ora11g/system01.dbf
BLOCK = 96033
Block 96033 is corrupt
Corrupt block relative dba: 0x00417721 (file 0, block 96033)
Bad check value found during verification
Data in bad block:
type: 6 format: 2 rdba: 0x00417721
last change scn: 0x0000.40032d33 seq: 0x5 flg: 0x06
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x2d330605
check value in block header: 0x5906
computed block checksum: 0x67
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 1
Total Blocks Influx : 0
Message 531 not found; product=RDBMS; facility=BBED
BBED> sum apply
Check value for File 1, Block 96033:
current = 0x5961, required = 0x5961
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/ora11g/system01.dbf
BLOCK = 96033
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
Message 531 not found; product=RDBMS; facility=BBED
BBED>
至此，修復結束。