Oracle ASM AMDU工具的使用

      Oracle 10g中, ASM磁盘组的信息需要在Mount之后才能通过内部视图查询， 如果磁盘组因为故障无法正常加载，那么信息将不可用， 这为ASM相关故障的诊断带来了诸多不便

      Oracle在11g中提供了AMDU， 可用于协助诊断，在ASM磁盘加载前，可以将ASM元数据从磁盘中抽取出来，用于数据库诊断。此工具可以向后兼容，引入到10g。

      使用方法：

[grid@dbhost01 ~]$ amdu -diskstring '/dev/asmdisk*'

amdu_2019_08_09_11_04_26/

[grid@dbhost01 ~]$ cd amdu_2019_08_09_11_04_26/

[grid@dbhost01 amdu_2019_08_09_11_04_26]$ ls -l

total 8

-rw-r--r-- 1 grid oinstall 5367 Aug  9 11:04 report.txt

[grid@dbhost01 amdu_2019_08_09_11_04_26]$ more report.txt 

-*-amdu-*-

******************************* AMDU Settings ********************************

ORACLE_HOME = /u01/app/11.2.0/grid

System name: Linux

Node name: dbhost01

Release: 3.10.0-862.el7.x86_64

Version: #1 SMP Wed Mar 21 18:14:51 EDT 2018

Machine: x86_64

amdu run: 09-AUG-19 11:04:26

Endianess: 1

抽取整个数据库文件的流程如下：

1. 在告警日志中定位控制文件在ASM文件系统中的编号

Starting up:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, Real Application Clusters, OLAP, Data Mining

and Real Application Testing options.

ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1

System name: Linux

Node name: dbhost01

Release: 3.10.0-862.el7.x86_64

Version: #1 SMP Wed Mar 21 18:14:51 EDT 2018

Machine: x86_64

VM name: VMWare Version: 6

Using parameter settings in server-side pfile /u01/app/oracle/product/11.2.0/db_1/dbs/initorcl1.ora

System parameters with non-default values:

  processes                = 150

  spfile                   = "+DATA/orcl/spfileorcl.ora"

  memory_target            = 1584M

  control_files            = " +DATA/orcl/controlfile/current.260.1008261229 "

  db_block_size            = 8192

  compatible               = "11.2.0.4.0"

  cluster_database         = TRUE

  db_create_file_dest      = "+DATA"

  thread                   = 1

  undo_tablespace          = "UNDOTBS1"

  instance_number          = 1

  remote_login_passwordfile= "EXCLUSIVE"

  db_domain                = ""

  dispatchers              = "(PROTOCOL=TCP) (SERVICE=orclXDB)"

  remote_listener          = "myrac-cluster-scan:1521"

  audit_file_dest          = "/u01/app/oracle/admin/orcl/adump"

  audit_trail              = "DB"

  db_name                  = "orcl"

  open_cursors             = 300

  diagnostic_dest          = "/u01/app/oracle"

2. 抽取控制文件

   

[grid@dbhost01 amdu_2019_08_09_11_04_26]$ amdu -extract +DATA.260

AMDU-00108: file name invalid [+DATA.260]

[grid@dbhost01 amdu_2019_08_09_11_04_26]$ amdu -extract DATA.260

amdu_2019_08_09_14_20_11/

AMDU-00210: No disks found in diskgroup DATA

AMDU-00210: No disks found in diskgroup DATA

[grid@dbhost01 amdu_2019_08_09_11_04_26]$ amdu -diskstring "/dev/asmdisk*" -extract DATA.260

amdu_2019_08_09_14_20_42/

[grid@dbhost01 amdu_2019_08_09_11_04_26]$ ls -l amdu_2019_08_09_14_20_42

total 18072

-rw-r--r-- 1 grid oinstall 18497536 Aug  9 14:20 DATA_260.f

-rw-r--r-- 1 grid oinstall     7306 Aug  9 14:20 report.txt

[grid@dbhost01 amdu_2019_08_09_11_04_26]$ 

[grid@dbhost01 amdu_2019_08_09_11_04_26]$ 

[grid@dbhost01 amdu_2019_08_09_11_04_26]$

3. 从控制文件中获取数据文件，日志等信息

   

[grid@dbhost01 amdu_2019_08_09_14_20_42]$ strings DATA_260.f | grep +DATA > DATAFILE_ORCL.txt

[grid@dbhost01 amdu_2019_08_09_14_20_42]$ 

[grid@dbhost01 amdu_2019_08_09_14_20_42]$ ls -l 

total 18076

-rw-r--r-- 1 grid oinstall 18497536 Aug  9 14:20 DATA_260.f

-rw-r--r-- 1 grid oinstall      987 Aug  9 14:23 DATAFILE_ORCL.txt

-rw-r--r-- 1 grid oinstall     7306 Aug  9 14:20 report.txt

[grid@dbhost01 amdu_2019_08_09_14_20_42]$ more DATAFILE_ORCL.txt 

+DATA/orcl/onlinelog/group_2.262.1008261231

+DATA/orcl/onlinelog/group_1.261.1008261231

4.  按照第三步的输出，抽取出日志文件，数据文件等等

amdu -diskstring "/dev/asmdisk*" -extract DATA.259

amdu -diskstring "/dev/asmdisk*" -extract DATA.258

amdu -diskstring "/dev/asmdisk*" -extract DATA.257

amdu -diskstring "/dev/asmdisk*" -extract DATA.256

amdu -diskstring "/dev/asmdisk*" -extract DATA.263

amdu -diskstring "/dev/asmdisk*" -extract DATA.264

amdu -diskstring "/dev/asmdisk*" -extract DATA.265

amdu -diskstring "/dev/asmdisk*" -extract DATA.266

amdu -diskstring "/dev/asmdisk*" -extract DATA.267

amdu -diskstring "/dev/asmdisk*" -extract DATA.262

amdu -diskstring "/dev/asmdisk*" -extract DATA.261

5.  新建实例，利用抽取的控制文件，启动至mount

    并使用alter database rename file改名等启动数据库