Use Oracle AMDU to extract data files from the ASM disk group

Use Oracle AMDU to extract data files from the ASM disk group

Amdu-diskstring '<disk string>'-extract '<diskgroup name>. <file number>'
 
The data file number can be obtained based on the MySQL instance query v $ asm_file view.

You can also query v $ datafile. If an alias is used, you can use v $ asm_alias;

SQL> select name from v $ datafile;

NAME
--------------------------------------------------------------------------------
+ DATA/db1/datafile/system.256.794361477
+ DATA/db1/datafile/sysaux.257.794361477
+ DATA/db1/datafile/undotbs1.258.794361477
+ DATA/db1/datafile/users.259.794361477 <(= this files need to be extracted
+ DATA/db1/datafile/example.261.794361601
+ DATA/db1/datafile/testasm.263.817147851
+ DATA/db1/datafile/dbfs_ts.264.822088469
 
 
For example, we want to extract data files under the users tablespace.

Full File name = "+ DATA/db1/datafile/users.259.794361477"

File Number = "259"

Disk String = "/dev/Oracleasm/disks /*"

Diskgroup Name = "DATA"

Extracted File = DATA_259.f
 
Amdu-diskstring '/dev/oracleasm/disks/*'-extract 'data. 100'

A folder named amdu _ plus date is generated in the current directory.

[Grid @ dbaasm ~] $ Cd amdu_2013_08_31_00_17_17/
[Grid @ dbaasm amdu_2013_08_31_00_17_17] $ ls-l
Total 2099228
-Rw-r -- 1 grid oinstall 2147491840 Aug 31 DATA_259.f
-Rw-r -- 1 grid oinstall 14514 Aug 31 report.txt
 
The format of the generated data file is the disk group + data file number, and the suffix is "point f". Then, rename it to the corresponding tablespace name "users. dbf ".
 
[Grid @ dbaasm amdu_2013_08_31_00_17_17] $ mv DATA_259.f users. dbf
[Grid @ dbaasm amdu_2013_08_31_00_17_17] $ ls-l
Total 2099228
-Rw-r -- 1 grid oinstall 14514 Aug 31 report.txt
-Rw-r -- 1 grid oinstall 2147491840 Aug 31 users. dbf <(======

Last weekend, due to storage failure, the asm disk could not be loaded normally. This method was used to restore data for the customer.

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