改动file header (測)-白红宇

改动file header (測)

阅读量：6956 次

发布时间：2019-06-27

本文共 12627 字，大约阅读时间需要 42 分钟。

--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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