使用oradebug修改数据库scn

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标题:使用oradebug修改数据库scn

作者:惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

闲着无事看到几篇文章介绍了使用oradebug修改数据库scn的案例,这里也做了两个测试,发现该功能确实很巧妙,通过修改内存中的scn值,然后写入控制文件和数据文件,实现修改scn的方法,不过同样该方法的危害性极大,这里仅供测试使用,生产环境切不可乱使用,可能引起很严重后果
数据库版本信息

SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production

SQL> select '惜分飞' XIFENFEI FROM DUAL;

XIFENF
------
惜分飞

在open库中修改scn

SQL> oradebug setmypid
Statement processed.

--查看当前scn
SQL>  oradebug DUMPvar SGA kcsgscn_
kcslf kcsgscn_ [20009228, 20009248) = 00000000 0007A09F 00000019 00000000 00000000 00000000 00000000 20009034
SQL>  select CHECKPOINT_CHANGE# a from v$datafile;

         A
----------
    499314
    499314
    499314
    499314

SQL> select dbms_flashback.get_system_change_number a from dual;

         A
----------
    499877

SQL> select to_number('7A09F','xxxxxxxxx') from dual;

TO_NUMBER('7A09F','XXXXXXXXX')
------------------------------
                        499871

--修改内存中scn值(十进制)
SQL>  oradebug poke 0x20009228 4 8
BEFORE: [20009228, 2000922C) = 00000000
AFTER:  [20009228, 2000922C) = 00000008
SQL> oradebug DUMPvar SGA kcsgscn_
kcslf kcsgscn_ [20009228, 20009248) = 00000008 0007A0D8 00000052 00000000 00000000 00000000 00000000 20009034

SQL> col a for 999999999999999
SQL> select dbms_flashback.get_system_change_number a from dual;

         A
------------
34360238301

SQL> select to_number('8','xx')*4294967296+to_number('0007A0D8','xxxxxxxx') a from dual;

               A
----------------
     34360238296

--做一个checkpoint为了内存中的scn值写入控制文件和数据文件
SQL>  alter system checkpoint;

System altered.

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  318767104 bytes
Fixed Size                  1267236 bytes
Variable Size              96471516 bytes
Database Buffers          213909504 bytes
Redo Buffers                7118848 bytes
Database mounted.
Database opened.

SQL> col a for 999999999999999
SQL> select CHECKPOINT_CHANGE# a from v$datafile;

               A
----------------
     34360238496
     34360238496
     34360238496
     34360238496

SQL> select CHECKPOINT_CHANGE# a from v$datafile_header;

               A
----------------
     34360238496
     34360238496
     34360238496
     34360238496

在mount库中修改scn

SQL> startup mount
ORACLE instance started.

Total System Global Area  318767104 bytes
Fixed Size                  1267236 bytes
Variable Size              96471516 bytes
Database Buffers          213909504 bytes
Redo Buffers                7118848 bytes
Database mounted.
SQL> oradebug setmypid
Statement processed.
--因为数据库是mount状态不能看到scn值
SQL>  oradebug DUMPvar SGA kcsgscn_
kcslf kcsgscn_ [20009228, 20009248) = 00000000 00000000 00000000 00000000 00000000 00000000 00000000 20009034
SQL>  col a for 999999999999999
SQL> select CHECKPOINT_CHANGE# a from v$datafile_header;

               A
----------------
     34360240739
     34360240739
     34360240739
     34360240739

--求出WRAP SCN值
SQL> select 34360240739/4294967296 from dual;

34360240739/4294967296
----------------------
            8.00011697

--修改内存中scn值(十六进制)
SQL> oradebug poke 0x20009228 4 0x0000000a
BEFORE: [20009228, 2000922C) = 00000000
AFTER:  [20009228, 2000922C) = 0000000A
SQL> oradebug DUMPvar SGA kcsgscn_
kcslf kcsgscn_ [20009228, 20009248) = 0000000A 00000000 00000000 00000000 00000000 00000000 00000000 20009034

SQL> alter database open;

Database altered.

SQL> select dbms_flashback.get_system_change_number a from dual
  2  ;

               A
----------------
     42949673074

--注意:使用此种方法修改BASE SCN如果不指定,会从0开始计数
SQL>  oradebug DUMPvar SGA kcsgscn_
kcslf kcsgscn_ [20009228, 20009248) = 0000000A 00000077 0000001C 00000000 00000000 00000000 00000000 20009034
SQL> select to_number('A','xx')*4294967296+to_number('00000077','xxxxxxxx') a from dual;

               A
----------------
     42949673079

SQL> alter system checkpoint;

System altered.

SQL> select CHECKPOINT_CHANGE# a from v$datafile_header;

               A
----------------
     42949673095
     42949673095
     42949673095
     42949673095

SQL> select CHECKPOINT_CHANGE# a from v$datafile;

               A
----------------
     42949673095
     42949673095
     42949673095
     42949673095

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  318767104 bytes
Fixed Size                  1267236 bytes
Variable Size              96471516 bytes
Database Buffers          213909504 bytes
Redo Buffers                7118848 bytes
Database mounted.
Database opened.
SQL> select CHECKPOINT_CHANGE# a from v$datafile_header;

               A
----------------
     42949673231
     42949673231
     42949673231
     42949673231

在oradebug推进scn的过程中,需要注意不同平台,不同位数的ORACLE数据库可能推进方式有一定的区别,操作前最好在系统平台位数上进行测试,否则有可能导致恢复后果更加麻烦

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使用oradebug修改数据库scn》有 3 条评论

  1. 惜分飞 说:

    1. scn有两个部分组成wrap scn和base scn,所以第一个问题,你去了解scn的组成
    2. 关于a是一个假设值

    –求出WRAP SCN值
    SQL> select 34360240739/4294967296 from dual;

    34360240739/4294967296
    ———————- 8.00011697

    –修改内存中scn值(十六进制)
    SQL> oradebug poke 0×20009228 4 0x0000000a
    BEFORE: [20009228, 2000922C) = 00000000
    AFTER:[20009228, 2000922C) = 0000000A

    此处算warp scn是要做什么?另外,修改的scn 0x0000000a 这个值怎么算出来的?

      [引用]  [回复]

  2. eooyc 说:

    –求出WRAP SCN值
    SQL> select 34360240739/4294967296 from dual;

    34360240739/4294967296
    ———————-
    8.00011697

    –修改内存中scn值(十六进制)
    SQL> oradebug poke 0×20009228 4 0x0000000a
    BEFORE: [20009228, 2000922C) = 00000000
    AFTER: [20009228, 2000922C) = 0000000A

    此处算warp scn是要做什么?另外,修改的scn 0x0000000a 这个值怎么算出来的?

      [引用]  [回复]

  3. 惜分飞 说:

    ORADEBUG POKE使用说明

    POKE
    
    To poke memory locations use
    
    ORADEBUG POKE address length value
    where address and value can be decimal or hexadecimal and length is in bytes
    
    For Example
    
        ORADEBUG POKE 0x20005F0C 4 0x46495845
        ORADEBUG POKE 0x20005F10 4 0x44205349
        ORADEBUG POKE 0x20005F14 2 0x5A45
    WARNING Do not use the POKE command on a production system
    

      [引用]  [回复]

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