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数据恢复:如何用BBED模拟Oracle坏块学习恢复技能

发布时间:2017-04-10     来源:华军数据恢复中心     [打印]
BBED是Block Browser/Editor的缩写,是Oracle的一个内部工具,不对外发布文档及支持。 BBED随软件发布,但是我们需要进行简单的relink才能使用。

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虽然BBED工具的使用存在很多风险,但是如果利用得当,可以以之解决很多棘手的问题,并且可以练习坏块修复等技术。

 

例如在Oracle10g中的bbed工具,同样需要我们手工relink才能使用,这个版本的工具同样可以在其他版本的数据库中使用:

[oracle@danaly lib]$ make -f ins_rdbms.mk $ORACLE_HOME/rdbms/lib/bbed

 

Linking BBED utility (bbed)

rm -f /opt/oracle/product/10.2.0/rdbms/lib/bbed

gcc -o /opt/oracle/product/10.2.0/rdbms/lib/bbed ...

   -L/opt/oracle/product/10.2.0/lib

 

[oracle@danaly lib]$ bbed

Password: 

BBED: Release 2.0.0.0.0 - Limited Production on Sun Sep 3 12:42:59 2006

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

 

************* !!! For Oracle Internal Use only !!! ***************

 

BBED> help ALL

SET DBA [ dba | file#, block# ]

SET FILENAME 'filename'

SET FILE file#

SET BLOCK [+/-]block#

SET OFFSET [ [+/-]byte offset | symbol | *symbol ]

SET BLOCKSIZE bytes

SET LIST[FILE] 'filename'

SET WIDTH character_count

SET COUNT bytes_to_display

SET IBASE [ HEX | OCT | DEC ]

SET OBASE [ HEX | OCT | DEC ]

SET MODE  [ BROWSE | EDIT ]

SET SPOOL [ Y | N ]

SHOW [  | ALL ]

POP [ALL]

REVERT [ DBA | FILE | FILENAME | BLOCK ]

UNDO

HELP [  | ALL ]

VERIFY [ DBA | FILE | FILENAME | BLOCK ]

CORRUPT [ DBA | FILE | FILENAME | BLOCK ]

 

Oracle Database 11g中缺省的未提供BBED库文件,但是可以用10g的文件编译出来,参考如下步骤:

1.复制Oracle 10g文件

Copy $ORA10g_HOME/rdbms/lib/ssbbded.o to $ORA11g_HOME/rdbms/lib

Copy $ORA10g_HOME/rdbms/lib/sbbdpt.o to $ORA11g_HOME/rdbms/lib

 

Copy $ORA10g_HOME/rdbms/mesg/bbedus.msb to $ORA11g_HOME/rdbms/mesg

Copy $ORA10g_HOME/rdbms/mesg/bbedus.msg to $ORA11g_HOME/rdbms/mesg

Copy $ORA10g_HOME/rdbms/mesg/bbedar.msb to $ORA11g_HOME/rdbms/mesg

 

2.编译

make -f $ORA11g_HOME/rdbms/lib/ins_rdbms.mk BBED=$ORACLE_HOME/bin/bbed $ORACLE_HOME/bin/bbed

 

BBED的缺省口令为blockedit,请谨慎使用,内部工具。Oracle不做技术支持。

 

我前面提到,可以通过这个工具模拟坏块,以便进行坏块相关的学习和研究,以下是一个示例.

 

1.备份数据文件

本测试中恢复损坏的文件,需要存在一个良好文件,本文简单冷备份一下文件.

[oracle@jumper conner]$ cp users01.dbf users01.dbf.bak

 

2.修改BBED参数文件

加入备份文件

[oracle@jumper conner]$ vi filelist.txt 

 

         1 /opt/oracle/oradata/conner/system01.dbf       440401920

         2 /opt/oracle/oradata/conner/undotbs01.dbf      104857600

         3 /opt/oracle/oradata/conner/users01.dbf        27262976

         4 /opt/oracle/oradata/conner/users01.dbf.bak    27262976

~

~

~

"filelist.txt" 4L, 259C written    

 

[oracle@jumper conner]$ more par.bbd 
blocksize=8192
listfile=filelist.txt
mode=edit

 

3.破坏数据块

[oracle@jumper conner]$ bbed parfile=par.bbd 

Password: 

 

BBED: Release 2.0.0.0.0 - Limited Production on Sun Sep 11 22:30:11 2005

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

 

************* !!! For Oracle Internal Use only !!! ***************

 

BBED> set file 3

        FILE#           3

 

BBED> modify 1000 file 3 block 17

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

 File: /opt/oracle/oradata/conner/users01.dbf (3)

 Block: 17               Offsets:    0 to  511           Dba:0x00c00011

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

 03e80000 1100c000 75b5a320 00000104 06300000 01000000 611e0000 72b5a320 

 00000000 03003201 0900c000 ffff0000 00000000 00000000 00000000 00800000 

 72b5a320 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00012600 

 ffff5e00 d5037703 77030000 2600c21e 101e581d a91cf61b 471b941a dd192819 

 6218b417 06175216 9715dd14 26146c13 b4120712 44118310 bc0ffa0e 380e790d 

 b60cf40b 350b790a c0090409 45088b07 cc060e06 57059804 d5030000 00000000 

 

 <32 bytes per line>

 

BBED> verify

DBVERIFY - Verification starting

FILE = /opt/oracle/oradata/conner/users01.dbf

BLOCK = 17

 

Block 17 is corrupt

***

Corrupt block relative dba: 0x00c00011 (file 0, block 17)

Bad header found during verification

Data in bad block -

 type: 3 format: 0 rdba: 0x00c00011

 last change scn: 0x0000.20a3b575 seq: 0x1 flg: 0x04

 consistency value in tail: 0xb5750601

 check value in block header: 0x3006, computed block checksum: 0xea05

 spare1: 0x0, spare2: 0x0, spare3: 0x0

***

 

BBED> quit

 

 

4.从备份文件中copy良好数据块进行恢复

                                                          

[oracle@jumper conner]$ bbed parfile=par.bbd 

Password: 

 

BBED: Release 2.0.0.0.0 - Limited Production on Sun Sep 11 22:33:55 2005

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

 

************* !!! For Oracle Internal Use only !!! ***************

 

BBED> set file 4

        FILE#           4

 

BBED> show

        FILE#           4

        BLOCK#          1

        OFFSET          0

        DBA             0x01000001 (16777217 4,1)

        FILENAME        /opt/oracle/oradata/conner/users01.dbf.bak

        BIFILE          bifile.bbd

        LISTFILE        filelist.txt

        BLOCKSIZE       8192

        MODE            Edit

        EDIT            Unrecoverable

        IBASE           Dec

        OBASE           Dec

        WIDTH           80

        COUNT           512

        LOGFILE         log.bbd

        SPOOL           No

 

BBED> copy file 4 block 17 to file 3 block 17;

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

 File: /opt/oracle/oradata/conner/users01.dbf (3)

 Block: 17               Offsets:    0 to  511           Dba:0x00c00011

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

 06020000 1100c000 75b5a320 00000104 06300000 01000000 611e0000 72b5a320 

 00000000 03003201 0900c000 ffff0000 00000000 00000000 00000000 00800000 

 72b5a320 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00012600 

 ffff5e00 d5037703 77030000 2600c21e 101e581d a91cf61b 471b941a dd192819 

 6218b417 06175216 9715dd14 26146c13 b4120712 44118310 bc0ffa0e 380e790d 

 b60cf40b 350b790a c0090409 45088b07 cc060e06 57059804 d5030000 00000000 

 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

 

 <32 bytes per line>

 

BBED> verify

DBVERIFY - Verification starting

FILE = /opt/oracle/oradata/conner/users01.dbf

BLOCK = 17

 

 

DBVERIFY - Verification complete

 

Total Blocks Examined         : 1

Total Blocks Processed (Data) : 1

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