--改动file header

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

cd $ORACLE_H0ME/rdbms/lib

./bbed blockedit

set filename '/u01/app/oracle/product/10.2.0/db_1/dbs/test01.dbf'

show

map /v

p kcvfhckp

BBED> modify /x 005a





--拷贝 文件 那块 要好好測试 和认知









BBED> showv

        FILE#           1

        BLOCK#          1

        OFFSET          0

        DBA             0x00400001 (4194305 1,1)

        FILENAME        /u01/app/oracle/oradata/test/block.dbf

        BIFILE          bifile.bbd

        LISTFILE        list

        BLOCKSIZE       8192

        MODE            Edit

        EDIT            Unrecoverable

        IBASE           Dec

        OBASE           Dec

        WIDTH           80

        COUNT           512

        LOGFILE         log.bbd

        SPOOL           No





BBED> map /v

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                                     Dba:0x00400001

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

 Data File Header





 struct kcvfh, 676 bytes                    @0       

    struct kcvfhbfh, 20 bytes               @0       

    struct kcvfhhdr, 76 bytes               @20      

    ub4 kcvfhrdb                            @96      

    struct kcvfhcrs, 8 bytes                @100     

    ub4 kcvfhcrt                            @108     

    ub4 kcvfhrlc                            @112     

    struct kcvfhrls, 8 bytes                @116     

    ub4 kcvfhbti                            @124     

    struct kcvfhbsc, 8 bytes                @128     

    ub2 kcvfhbth                            @136

ub2 kcvfhsta                            @138               //强制打开数据库的时候  有的资料上说这个也要改动

图片来源(oracle 实战攻略)

struct kcvfhckp, 36 bytes               @484       改动的三个部分!   9i 140 处

ub4 kcvfhcpc                            @140     

    ub4 kcvfhrts                            @144     

    ub4 kcvfhccc                            @148     

    struct kcvfhbcp, 36 bytes               @152     

    ub4 kcvfhbhz                            @312     

    struct kcvfhxcd, 16 bytes               @316     

    word kcvfhtsn                           @332     

    ub2 kcvfhtln                            @336     

    text kcvfhtnm[30]                       @338     

    ub4 kcvfhrfn                            @368     

    struct kcvfhrfs, 8 bytes                @372     

    ub4 kcvfhrft                            @380     

    struct kcvfhafs, 8 bytes                @384     

    ub4 kcvfhbbc                            @392     

    ub4 kcvfhncb                            @396     

    ub4 kcvfhmcb                            @400     

    ub4 kcvfhlcb                            @404     

    ub4 kcvfhbcs                            @408     

    ub2 kcvfhofb                            @412     

    ub2 kcvfhnfb                            @414     

    ub4 kcvfhprc                            @416     

    struct kcvfhprs, 8 bytes                @420     

    struct kcvfhprfs, 8 bytes               @428     

    ub4 kcvfhtrt                            @444     





 ub4 tailchk                                @8188    









BBED> p kcvfhckp

struct kcvfhckp, 36 bytes                   @484     

   struct kcvcpscn, 8 bytes                 @484     

      ub4 kscnbas                           @484      0x000ddc27   --

      ub2 kscnwrp                           @488      0x0000

   ub4 kcvcptim                             @492      0x2d2fe78a   --

   ub2 kcvcpthr                             @496      0x0001

   union u, 12 bytes                        @500     

      struct kcvcprba, 12 bytes             @500     

         ub4 kcrbaseq                       @500      0x00000011

         ub4 kcrbabno                       @504      0x00000002

         ub2 kcrbabof                       @508      0x0010

   ub1 kcvcpetb[0]                          @512      0x02

   ub1 kcvcpetb[1]                          @513      0x00

   ub1 kcvcpetb[2]                          @514      0x00

   ub1 kcvcpetb[3]                          @515      0x00

   ub1 kcvcpetb[4]                          @516      0x00

   ub1 kcvcpetb[5]                          @517      0x00

   ub1 kcvcpetb[6]                          @518      0x00

   ub1 kcvcpetb[7]                          @519      0x00

BBED> p kcvfhcpc

ub4 kcvfhcpc                                @140      0x00000032 --





BBED> p kcvfhccc

ub4 kcvfhccc                                @148      0x00000031 --

--改动以上几个数据就能够了

BBED> set offset 484 count 16

        OFFSET          484

        COUNT           16





BBED> dump /v

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1       Offsets:  484 to  499  Dba:0x00400001

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

 27dc0d00 00005a00 8ae72f2d 01000000 l '?...Z..?-....





 <16 bytes per line>'

--一下是详细的实验步骤

--shutdown database and reopen to mount

SQL> shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup mount

ORACLE instance started.





Total System Global Area  184549376 bytes

Fixed Size                  1218412 bytes

Variable Size              92276884 bytes

Database Buffers           88080384 bytes

Redo Buffers                2973696 bytes

Database mounted.

--update datafile header

BBED> show

        FILE#           1

        BLOCK#          1

        OFFSET          0

        DBA             0x00400001 (4194305 1,1)

        FILENAME        /u01/app/oracle/oradata/test/block.dbf

        BIFILE          bifile.bbd

        LISTFILE        list

        BLOCKSIZE       8192

        MODE            Edit

        EDIT            Unrecoverable

        IBASE           Dec

        OBASE           Dec

        WIDTH           80

        COUNT           512

        LOGFILE         log.bbd

        SPOOL           No





BBED> p kcvfhckp

struct kcvfhckp, 36 bytes                   @484     

   struct kcvcpscn, 8 bytes                 @484     

      ub4 kscnbas                           @484      0x000df330

      ub2 kscnwrp                           @488      0x0000

   ub4 kcvcptim                             @492      0x2d3006c5

   ub2 kcvcpthr                             @496      0x0001

   union u, 12 bytes                        @500     

      struct kcvcprba, 12 bytes             @500     

         ub4 kcrbaseq                       @500      0x00000011

         ub4 kcrbabno                       @504      0x00002da7

         ub2 kcrbabof                       @508      0x0010

   ub1 kcvcpetb[0]                          @512      0x02

   ub1 kcvcpetb[1]                          @513      0x00

   ub1 kcvcpetb[2]                          @514      0x00

   ub1 kcvcpetb[3]                          @515      0x00

   ub1 kcvcpetb[4]                          @516      0x00

   ub1 kcvcpetb[5]                          @517      0x00

   ub1 kcvcpetb[6]                          @518      0x00

   ub1 kcvcpetb[7]                          @519      0x00





BBED> p kcvfhcpc

ub4 kcvfhcpc                                @140      0x00000033





BBED> p kcvfhccc

ub4 kcvfhccc                                @148      0x00000032





BBED> set offset 484 count 16

        OFFSET          484

        COUNT           16





BBED> dump /v

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1       Offsets:  484 to  499  Dba:0x00400001

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

 30f30d00 00000000 c506302d 01000a00 l 0?.....?0-....





 <16 bytes per line>





BBED> modify /x 20

Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  484 to  499           Dba:0x00400001

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

 20f30d00 00000000 c506302d 01000a00 





 <32 bytes per line>





BBED> set offset 492

        OFFSET          492





BBED> dump

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  492 to  507           Dba:0x00400001

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

 c506302d 01000a00 11000000 a72d0000 





 <32 bytes per line>





BBED> modify /x c0

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  492 to  507           Dba:0x00400001

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

 c006302d 01000a00 11000000 a72d0000 





 <32 bytes per line>





BBED> set offset 140

        OFFSET          140





BBED> dump

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  140 to  155           Dba:0x00400001

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

 33000000 ea63292d 32000000 00000000 





 <32 bytes per line>





BBED> modify /x 31

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  140 to  155           Dba:0x00400001

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

 31000000 ea63292d 32000000 00000000 





 <32 bytes per line>





BBED>  set offset 148

        OFFSET          148





BBED> modify

BBED-00203: incomplete/malformed command









BBED> modify /x 30

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  148 to  163           Dba:0x00400001

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

 30000000 00000000 00000000 00000000 





 <32 bytes per line>





BBED> sum apply-------------------------------------------------------------------------------------

Check value for File 1, Block 1:

current = 0xa51f, required = 0xa51f

--alter database open

SQL> alter database open;

alter database open

*

ERROR at line 1:

ORA-01113: file 5 needs media recovery

ORA-01110: data file 5: '/u01/app/oracle/oradata/test/block.dbf'

--modify the file header from system

BBED> set offset 484 count 16

        OFFSET          484

        COUNT           16





BBED> dump /v

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1       Offsets:  484 to  499  Dba:0x00400001

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

 30f30d00 00000000 c506302d 01000a00 l 0?.....?0-....





 <16 bytes per line>





BBED> modify /x 20

Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  484 to  499           Dba:0x00400001

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

 20f30d00 00000000 c506302d 01000a00 





 <32 bytes per line>





BBED> set offset 492

        OFFSET          492





BBED> dump

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  492 to  507           Dba:0x00400001

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

 c506302d 01000a00 11000000 a72d0000 





 <32 bytes per line>





BBED> modify /x c0

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  492 to  507           Dba:0x00400001

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

 c006302d 01000a00 11000000 a72d0000 





 <32 bytes per line>





BBED> set offset 140

        OFFSET          140





BBED> dump

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  140 to  155           Dba:0x00400001

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

 33000000 ea63292d 32000000 00000000 





 <32 bytes per line>





BBED> modify /x 31

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  140 to  155           Dba:0x00400001

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

 31000000 ea63292d 32000000 00000000 





 <32 bytes per line>





BBED>  set offset 148

        OFFSET          148





BBED> modify

BBED-00203: incomplete/malformed command









BBED> modify /x 30

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  148 to  163           Dba:0x00400001

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

 30000000 00000000 00000000 00000000 





 <32 bytes per line>





BBED> sum apply

Check value for File 1, Block 1:

current = 0xa51f, required = 0xa51f





BBED> set offset 484

        OFFSET          484





BBED> dump /v count 16

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1       Offsets:  484 to  499  Dba:0x00400001

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

 20f30d00 00000000 c006302d 01000a00 l  ?.....?0-....





 <16 bytes per line>





BBED> modify /x 30

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  484 to  499           Dba:0x00400001

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

 30f30d00 00000000 c006302d 01000a00 





 <32 bytes per line>





BBED> set offset 492 

        OFFSET          492





BBED> dump /v

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1       Offsets:  492 to  507  Dba:0x00400001

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

 c006302d 01000a00 11000000 a72d0000 l ?0-........?..





 <16 bytes per line>





BBED> modify /c5

BBED-00201: invalid switch (/c5)









BBED> modify /x c5

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  492 to  507           Dba:0x00400001

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

 c506302d 01000a00 11000000 a72d0000 





 <32 bytes per line>





BBED> set offset 140

        OFFSET          140





BBED> dump /v

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1       Offsets:  140 to  155  Dba:0x00400001

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

 31000000 ea63292d 30000000 00000000 l 1...阠)-0.......





 <16 bytes per line>





BBED> modify /x 33

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  140 to  155           Dba:0x00400001

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

 33000000 ea63292d 30000000 00000000 





 <32 bytes per line>





BBED> set offset 148

        OFFSET          148





BBED> dump /v

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1       Offsets:  148 to  163  Dba:0x00400001

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

 30000000 00000000 00000000 00000000 l 0...............





 <16 bytes per line>





BBED> modify /x 32

 File: /u01/app/oracle/oradata/test/block.dbf (1)

 Block: 1                Offsets:  148 to  163           Dba:0x00400001

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

 32000000 00000000 00000000 00000000 





 <32 bytes per line>





BBED> sum apply

Check value for File 1, Block 1:

current = 0xa50a, required = 0xa50a

--open the database

SQL> alter database open;





Database altered.





SQL> 

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

--数据有坏块 时候是否影响启动

--corrupt the block

BBED> p kcbh

struct kcbh, 20 bytes                       @0       

   ub1 type_kcbh                            @0        0x06

   ub1 frmt_kcbh                            @1        0xa2

   ub1 spare1_kcbh                          @2        0x00

   ub1 spare2_kcbh                          @3        0x00

   ub4 rdba_kcbh                            @4        0x0140000c

   ub4 bas_kcbh                             @8        0x000de97d

   ub2 wrp_kcbh                             @12       0x0000

   ub1 seq_kcbh                             @14       0x02

   ub1 flg_kcbh                             @15       0x04 (KCBHFCKV)

   ub2 chkval_kcbh                          @16       0x1c9c

   ub2 spare3_kcbh                          @18       0x0000





BBED> corrupt

Block marked media corrupt.





BBED> v

DBVERIFY - Verification starting

FILE = /u01/app/oracle/oradata/test/block.dbf

BLOCK = 12





Block Checking: DBA = 4194316, Block Type = KTB-managed data block

Found block already marked corrupted





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> p kcbh

struct kcbh, 20 bytes                       @0       

   ub1 type_kcbh                            @0        0x06

   ub1 frmt_kcbh                            @1        0xa2

   ub1 spare1_kcbh                          @2        0x00

   ub1 spare2_kcbh                          @3        0x00

   ub4 rdba_kcbh                            @4        0x0040000c

   ub4 bas_kcbh                             @8        0x00000000

   ub2 wrp_kcbh                             @12       0x0000

   ub1 seq_kcbh                             @14       0xff  --原来是02

   ub1 flg_kcbh                             @15       0x04 (KCBHFCKV)

   ub2 chkval_kcbh                          @16       0x1d91

   ub2 spare3_kcbh                          @18       0x0000





BBED> sum apply

Check value for File 1, Block 12:

current = 0x1d91, required = 0x1d91

--reopen the database

SQL> alter database open;





Database altered.





SQL> shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.





Total System Global Area  184549376 bytes

Fixed Size                  1218412 bytes

Variable Size              92276884 bytes

Database Buffers           88080384 bytes

Redo Buffers                2973696 bytes

Database mounted.

Database opened.

SQL> 

--一般坏块不影响数据库的启动

--改动回来 用corropt改动不会来 奶奶的 还是简单改改ff吧  revert 能够的 注意呀 奶奶的

--跟踪文件中的错误

Bad header found during buffer read

Data in bad block:

 type: 6 format: 2 rdba: 0x0040000c

 last change scn: 0x0000.00000000 seq: 0x2 flg: 0x04

 spare1: 0x0 spare2: 0x0 spare3: 0x0

 consistency value in tail: 0x00000602

 check value in block header: 0x1d91

 computed block checksum: 0x0

Reread of rdba: 0x0140000c (file 5, block 12) found same corrupted data

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

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