> $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`

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

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

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