Oracle 10g使用amdu抽取数据文件

环境：OEL 5.7 + Oracle 10.2.0.5 RAC
需求：实验在Oracle 10g环境使用amdu抽取数据库文件

本文主要目的是介绍3个知识点：

• 1.使amdu可以在oracle 10g环境中使用
• 2.使kfed可以在oracle 10g环境中使用
• 3.amdu如何抽取损坏的ASM磁盘组数据

1.使amdu可以在oracle 10g环境中使用

在Oracle 10g环境，并没有自带amdu工具，需要自行去下载： 具体可以参考MOS文档： - Placeholder for AMDU binaries and using with ASM 10g, 11g, 12c (文档 ID 553639.1)

> $cd <your directory>
> $export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:`pwd`   
> or $setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:`pwd`
> $export PATH=$PATH:`pwd`  or setenv PATH ${PATH}:`pwd`
> 
> or 
> 
> $cd <your directory>
> $export LIBPATH=$LIBPATH:`pwd` 
> or $setenv LIBPATH ${LIBPATH}:`pwd`
> $export PATH=$PATH:`pwd` or setenv PATH ${PATH}:`pwd`

注意：如果是AIX平台，则对应的是设置LIBPATH环境变量。我这里是Linux，所以设置LD_LIBRARY_PATH环境变量：

unzip /tmp/amdu_X86-64.zip 
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:`pwd` 
export PATH=$PATH:`pwd`

2.使kfed可以在oracle 10g环境中使用

在Oracle 10g环境kfed需要编译： - ASM tools used by Support : KFOD, KFED, AMDU (文档 ID 1485597.1)

KFED executable comes with installation from 11.1 onwards; for the older version you must build it.

编译方法如下：

$cd $ORACLE_HOME/rdbms/lib
$make -f ins_rdbms.mk ikfed

3.amdu如何抽取损坏的ASM磁盘组数据

在ASM磁盘组损坏时，如何使用amdu工具来抽取数据库文件： - How to Restore the Database Using AMDU after Diskgroup Corruption (文档 ID 1597581.1)

1. Create pfile of lost database , from database alert.log startup messages.

2. Startup database in nomount

3. Get the controlfile number from db alert log , it will show while starting the database here in this eg. its 256
eg., control_files='+DATA/orcl/controlfile/current.256.709676643'

If you have controlfile backup already in non-asm location edit the pfile to point to location of non-asm and then mount the database
If you dont have controlfile backup then go to step 4 after determining the file# from step 3

4. $ amdu -diskstring <asm_diskstring> -extract DATA.256 

5. shutdown the database and change the control_file location to point to the extracted file location

6. startup mount the database

7. once mounted, get the datafile file numbers using "select name from v$datafile"
  And get online redo logfile from "select * from v$logfile".

8. Extract all datafiles and redolog files in similar manner

9. alter database rename <datafile 1> to < newly extracte location>

10. open the database

实际可以做实验去验证下MOS这个步骤的可行性：
1.创建参数文件
2.启动数据库到nomount状态
3.获取到控制文件的number
4.抽出控制文件
5.关闭数据库，修改control_file值
6.启动数据库到mount状态
7.获取到数据文件、日志文件的number
8.抽取数据文件和redo日志文件
9.重命名数据库文件到新位置
10.打开数据库