How to Restore the Database Using AMDU after Diskgroup Corruption (Doc ID 1597581.1)

In this Document

Goal

Solution

APPLIES TO:

Oracle Database - Enterprise Edition - Version 11.1.0.6 to 11.2.0.4 [Release 11.1 to 11.2]
Information in this document applies to any platform.

GOAL

 How to resotore the database from AMDU after Disk corruption ?

SOLUTION

 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