OracleASMAMDU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

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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

[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]$

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

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