bbed 修改datafile header

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标题:bbed 修改datafile header

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SQL> startup
ORACLE instance started.

Total System Global Area  236000356 bytes
Fixed Size                   451684 bytes
Variable Size             201326592 bytes
Database Buffers           33554432 bytes
Redo Buffers                 667648 bytes
Database mounted.
ORA-01113: file 2 needs media recovery
ORA-01110: data file 2: '/opt/oracle/oradata/xifenfei/xff01.dbf'
提示数据文件2需要恢复,首选是recover datafile 2;,如果失败,可以考虑bbed修改scn的办法

SQL> select file#,to_char(checkpoint_change#,'999999999999') from v$datafile;

     FILE# TO_CHAR(CHECK
---------- -------------
         1  107374278108
         2  107374278108
         3  107374278108
         4  107374278108
         5  107374278108
         6  107374278108
         7  107374278108
         8  107374278108
         9  107374278108
        10  107374278108
        11  107374278108

11 rows selected.

SQL> select file#,online_status,to_char(change#,'999999999999') from v$recover_file;

     FILE# ONLINE_ TO_CHAR(CHANG
---------- ------- -------------
         2 ONLINE   107374277136

[oracle@localhost tmp]$ bbed parfile=/tmp/parfile.cnf
Password: 

BBED: Release 2.0.0.0.0 - Limited Production on Mon Aug 22 06:05:34 2011

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

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

BBED> info
 File#  Name                                                        Size(blks)
 -----  ----                                                        ----------
     1  /opt/oracle/oradata/xifenfei/system01.dbf                         1280
     2  /opt/oracle/oradata/xifenfei/xff01.dbf                            1280

BBED> set dba 1,1
        DBA             0x00400001 (4194305 1,1)

BBED> p kcvfhckp
struct kcvfhckp, 36 bytes                   @140     
   struct kcvcpscn, 8 bytes                 @140     
*    ub4 kscnbas                           @140      0x000175dc
      ub2 kscnwrp                           @144      0x0019
* ub4 kcvcptim                             @148      0x2d49fbbb
   ub2 kcvcpthr                             @152      0x0001
   union u, 12 bytes                        @156     
      struct kcvcprba, 12 bytes             @156     
         ub4 kcrbaseq                       @156      0x00000005
         ub4 kcrbabno                       @160      0x00008e05
         ub2 kcrbabof                       @164      0x0010
      struct kcvcptr, 12 bytes              @156     
         struct kcrtrscn, 8 bytes           @156     
            ub4 kscnbas                     @156      0x00000005
            ub2 kscnwrp                     @160      0x8e05
         ub4 kcrtrtim                       @164      0x09110010
   ub1 kcvcpetb[0]                          @168      0x02
   ub1 kcvcpetb[1]                          @169      0x00
   ub1 kcvcpetb[2]                          @170      0x00
   ub1 kcvcpetb[3]                          @171      0x00
   ub1 kcvcpetb[4]                          @172      0x00
   ub1 kcvcpetb[5]                          @173      0x00
   ub1 kcvcpetb[6]                          @174      0x00
   ub1 kcvcpetb[7]                          @175      0x00

BBED> p kcvfhcpc
*ub4 kcvfhcpc                                @176      0x0000007a

BBED> p kcvfhccc
*ub4 kcvfhccc                                @184      0x00000079
星号表示使用bbed修改datafile header scn需要考虑的地方

SQL> select to_char(to_number('19000175dc','xxxxxxxxxxxx'),'999999999999') from dual;

TO_CHAR(TO_NU
-------------
 107374278108
证实system01.dbf的scn为107374278108和v$datafile查询到的一致

BBED> set dba 2,1
        DBA             0x00800001 (8388609 2,1)

BBED> p kcvfhckp
struct kcvfhckp, 36 bytes                   @140     
   struct kcvcpscn, 8 bytes                 @140     
      ub4 kscnbas                           @140      0x00017210
      ub2 kscnwrp                           @144      0x0019
   ub4 kcvcptim                             @148      0x2d49fa27
   ub2 kcvcpthr                             @152      0x0001
   union u, 12 bytes                        @156     
      struct kcvcprba, 12 bytes             @156     
         ub4 kcrbaseq                       @156      0x00000005
         ub4 kcrbabno                       @160      0x00006f18
         ub2 kcrbabof                       @164      0x0010
      struct kcvcptr, 12 bytes              @156     
         struct kcrtrscn, 8 bytes           @156     
            ub4 kscnbas                     @156      0x00000005
            ub2 kscnwrp                     @160      0x6f18
         ub4 kcrtrtim                       @164      0x09110010
   ub1 kcvcpetb[0]                          @168      0x02
   ub1 kcvcpetb[1]                          @169      0x00
   ub1 kcvcpetb[2]                          @170      0x00
   ub1 kcvcpetb[3]                          @171      0x00
   ub1 kcvcpetb[4]                          @172      0x00
   ub1 kcvcpetb[5]                          @173      0x00
   ub1 kcvcpetb[6]                          @174      0x00
   ub1 kcvcpetb[7]                          @175      0x00

BBED> p kcvfhcpc
ub4 kcvfhcpc                                @176      0x00000034

BBED> p kcvfhccc
ub4 kcvfhccc                                @184      0x00000033


SQL> select to_char(to_number('1900017210','xxxxxxxxxxxx'),'999999999999') from dual;

TO_CHAR(TO_NU
-------------
 107374277136
和v$recover_file视图中查询出来一致

BBED> set dba 2,1 offset 140
        DBA             0x00800001 (8388609 2,1)
        OFFSET          140

BBED> show 
        FILE#           2
        BLOCK#          1
        OFFSET          140
        DBA             0x00800001 (8388609 2,1)
        FILENAME        /opt/oracle/oradata/xifenfei/xff01.dbf
        BIFILE          bifile.bbd
        LISTFILE        /tmp/list
        BLOCKSIZE       8192
        MODE            Edit
        EDIT            Unrecoverable
        IBASE           Dec
        OBASE           Dec
        WIDTH           80
        COUNT           32
        LOGFILE         log.bbd
        SPOOL           No

BBED> m /x dc750100
 File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
 Block: 1                Offsets:  140 to  171           Dba:0x00800001
------------------------------------------------------------------------
 dc750100 19000000 27fa492d 01000000 05000000 186f0000 10001109 02000000 

 <32 bytes per line>

BBED> m /x bbfb492d offset 158
 File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
 Block: 1                Offsets:  158 to  189           Dba:0x00800001
------------------------------------------------------------------------
 bbfb492d 00001000 11090200 00000000 00003400 00004cc0 492d3300 00000000 

 <32 bytes per line>

BBED> m /x 7a000000 offset 176
 File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
 Block: 1                Offsets:  176 to  207           Dba:0x00800001
------------------------------------------------------------------------
 7a000000 4cc0492d 33000000 00000000 00000000 00000000 00000000 00000000 

 <32 bytes per line>

BBED> m /x 79000000 offset 184
 File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
 Block: 1                Offsets:  184 to  215           Dba:0x00800001
------------------------------------------------------------------------
 79000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

 <32 bytes per line>
注意:p打印出来的值和m修改的值可能不是完全一致(和cpu的计算类型有关,常用的intel cpu中是倒序存储),可以选择先dump正确的相关值,然后m修改
如:p打印出来的值为:80084d1f时,m修改时要为: 1f4d0880

BBED> sum apply dba 2,1
Check value for File 2, Block 1:
current = 0x7ece, required = 0x7ece


SQL> shutdown immediate
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  236000356 bytes
Fixed Size                   451684 bytes
Variable Size             201326592 bytes
Database Buffers           33554432 bytes
Redo Buffers                 667648 bytes
Database mounted.
ORA-01122: database file 2 failed verification check
ORA-01110: data file 2: '/opt/oracle/oradata/xifenfei/xff01.dbf'
ORA-01207: file is more recent than controlfile - old controlfile
提示控制文件太老,需要重建控制文件

SQL> shutdown abort
ORACLE instance shut down.
SQL> STARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "XIFENFEI" NORESETLOGS  ARCHIVELOG
    MAXLOGFILES 50
    MAXLOGMEMBERS 5
    MAXDATAFILES 100
    MAXINSTANCES 1
    MAXLOGHISTORY 226
LOGFILE
  GROUP 1 '/opt/oracle/oradata/xifenfei/redo01.log'  SIZE 100M,
  GROUP 2 '/opt/oracle/oradata/xifenfei/redo02.log'  SIZE 100M,
  GROUP 3 '/opt/oracle/oradata/xifenfei/redo03.log'  SIZE 100M
DATAFILE
  '/opt/oracle/oradata/xifenfei/system01.dbf',
  '/opt/oracle/oradata/xifenfei/xff01.dbf',
  '/opt/oracle/oradata/xifenfei/cwmlite01.dbf',
  '/opt/oracle/oradata/xifenfei/drsys01.dbf',
  '/opt/oracle/oradata/xifenfei/example01.dbf',
  '/opt/oracle/oradata/xifenfei/indx01.dbf',
  '/opt/oracle/oradata/xifenfei/odm01.dbf',
  '/opt/oracle/oradata/xifenfei/tools01.dbf',
  '/opt/oracle/oradata/xifenfei/users01.dbf',
  '/opt/oracle/oradata/xifenfei/xdb01.dbf',
  '/opt/oracle/oradata/xifenfei/UNDOTBS01.dbf'
CHARACTER SET ZHS16GBK
;
ORACLE instance started.

Total System Global Area  236000356 bytes
Fixed Size                   451684 bytes
Variable Size             201326592 bytes
Database Buffers           33554432 bytes
Redo Buffers                 667648 bytes
SQL>   2    3    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   
Control file created.

SQL> alter database open;

Database altered.

SQL> ALTER TABLESPACE TEMP ADD TEMPFILE '/opt/oracle/oradata/xifenfei/temp01.dbf'
  2       SIZE 32505856  REUSE AUTOEXTEND ON NEXT 655360  MAXSIZE 32767M;
重建控制文件后,需要添加临时文件

补充说明:
1、datafile 的file header 存储在第一个block里
2、Oracle considers four attributes of this data structure when determining if a datafile is sync with the other data files of the database:(不同oracle版本offset可能不同)
(1)kscnbas (at offset 140) – SCN of last change to the datafile.
(2)kcvcptim (at offset 148) -Time of the last change to the datafile.
(3)kcvfhcpc (at offset 176) – Checkpoint count.
(4)kcvfhccc (at offset 184) – Unknown, but is always 1 less than thecheckpoint point count.
Oracle有4个属性来判断datafile 是否和其他的datafile 一致,如果都一致,可以正常操作,如果不一致,那么会报ORA-01113错误

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