TO Migrate the database files from disk
to asm disk is as follows,
1.configure flash recovery area.
2.Migrate datafiles to ASM.
3.Control file to ASM.
4.Create Temporary tablespace.
5.Migrate Redo logfiles
6.Migrate spfile to ASM.


step 1:Configure flash recovery area.

SQL> connect sys/sys@prod1 as sysdba
Connected.
SQL> alter database disable block change tracking;

Database altered.

SQL> alter system set db_recovery_file_dest_size=500m;

System altered.

SQL> alter system set db_recovery_file_dest=’+RECOVERYDEST’;

System altered


step 2 and 3: Migrate data files and control file
to ASM.

use RMAN to migrate the data files to ASM disk groups.
All data files will be migrated to the newly created disk group, DATA

SQL> alter system set db_create_file_dest='+DATA';

System altered.

SQL> alter system set control_files='+DATA/ctf1.dbf' scope=spfile;

System altered.

SQL> shu immediate

[oracle@rac1 bin]$ ./rman target /


RMAN> startup nomount

Oracle instance started


RMAN> restore controlfile from '/u01/new/oracle/oradata/mydb/control01.ctl';

Starting restore at 08-DEC-09

allocated channel: ORA_DISK_1

channel ORA_DISK_1: SID=146 device type=DISK

channel ORA_DISK_1: copied control file copy

output file name=+DATA/ctf1.dbf

Finished restore at 08-DEC-09

RMAN> alter database mount;

database mounted

released channel: ORA_DISK_1

RMAN> backup as copy database format '+DATA';
Starting backup at 08-DEC-09

allocated channel: ORA_DISK_1

channel ORA_DISK_1: SID=146 device type=DISK

channel ORA_DISK_1: starting datafile copy

input datafile file number=00001 name=/u01/new/oracle/oradata/mydb/system01.dbf

output file name=+DATA/mydb/datafile/system.257.705063763 tag=TAG20091208T110241 RECID=1 STAMP=705064274

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:08:39

channel ORA_DISK_1: starting datafile copy

input datafile file number=00002 name=/u01/new/oracle/oradata/mydb/sysaux01.dbf

output file name=+DATA/mydb/datafile/sysaux.258.705064283 tag=TAG20091208T110241 RECID=2 STAMP=705064812

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:08:56

channel ORA_DISK_1: starting datafile copy

input datafile file number=00003 name=/u01/new/oracle/oradata/mydb/undotbs01.dbf

output file name=+DATA/mydb/datafile/undotbs1.259.705064821 tag=TAG20091208T110241 RECID=3 STAMP=705064897

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:01:25

channel ORA_DISK_1: starting datafile copy

copying current control file

output file name=+DATA/mydb/controlfile/backup.260.705064907 tag=TAG20091208T110241 RECID=4 STAMP=705064912

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07

channel ORA_DISK_1: starting datafile copy

input datafile file number=00004 name=/u01/new/oracle/oradata/mydb/users01.dbf

output file name=+DATA/mydb/datafile/users.261.705064915 tag=TAG20091208T110241 RECID=5 STAMP=705064915

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:03

channel ORA_DISK_1: starting full datafile backup set

channel ORA_DISK_1: specifying datafile(s) in backup set

including current SPFILE in backup set

channel ORA_DISK_1: starting piece 1 at 08-DEC-09

channel ORA_DISK_1: finished piece 1 at 08-DEC-09

piece handle=+DATA/mydb/backupset/2009_12_08/nnsnf0_tag20091208t110241_0.262.705064919 tag=TAG20091208T110241 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01

Finished backup at 08-DEC-09

RMAN> switch database to copy;

datafile 1 switched to datafile copy "+DATA/mydb/datafile/system.257.705063763"

datafile 2 switched to datafile copy "+DATA/mydb/datafile/sysaux.258.705064283"

datafile 3 switched to datafile copy "+DATA/mydb/datafile/undotbs1.259.705064821"

datafile 4 switched to datafile copy "+DATA/mydb/datafile/users.261.705064915"

RMAN> alter database open;
database opened

RMAN> exit

Recovery Manager complete.


SQL> conn sys/oracle as sysdba

Connected.

SQL> select tablespace_name,file_name from dba_data_files;

TABLESPACE_NAME FILE_NAME

------------------------------ ---------------------------------------------

USERS +DATA/mydb/datafile/users.261.705064915

UNDOTBS1 +DATA/mydb/datafile/undotbs1.259.705064821

SYSAUX +DATA/mydb/datafile/sysaux.258.705064283

SYSTEM +DATA/mydb/datafile/system.257.705063763



SQL> select name from v$controlfile;


NAME
----

+DATA/ctf1.dbf

NO 16384 594

step 4:Migrate temp tablespace to ASM.

SQL> alter tablespace temp add tempfile size 100m;

Tablespace altered.

SQL> select file_name from dba_temp_files;

FILE_NAME

---------------------------------------------

+DATA/mydb/tempfile/temp.263.705065455

otherwise,
Create temporary tablespace in ASM disk group.

SQL> CREATE TABLESPACE temp1 TEMPFILE ‘+diskgroup1’;

SQL> alter database default temporary tablespace temp1;

Database altered.


step 5:Migrate redo logs to ASM.

SQL> select member,group# from v$logfile;

MEMBER GROUP#

-------------------------------------------------- ----------

/u01/new/oracle/oradata/mydb/redo03.log 3

/u01/new/oracle/oradata/mydb/redo02.log 2

/u01/new/oracle/oradata/mydb/redo01.log 1

SQL> alter database add logfile group 4 size 5m;

Database altered.

SQL> alter database add logfile group 5 size 5m;

Database altered.

SQL> alter database add logfile group 6 size 5m;

Database altered.

SQL> select member,group# from v$logfile;

MEMBER GROUP#

-------------------------------------------------- ----------

/u01/new/oracle/oradata/mydb/redo03.log 3

/u01/new/oracle/oradata/mydb/redo02.log 2

/u01/new/oracle/oradata/mydb/redo01.log 1

+DATA/mydb/onlinelog/group_4.264.705065691 4

+DATA/mydb/onlinelog/group_5.265.705065703 5

+DATA/mydb/onlinelog/group_6.266.705065719 6

SQL> alter system switch logfile;

System altered.

SQL> alter database drop logfile group 2;

Database altered.

SQL> alter database drop logfile group 3;

Database altered.

SQL> alter database drop logfile group 4;

Database altered.

SQL> alter database drop logfile group 1;

Database altered.

Add additional control file.

If an additional control file is required for redundancy,

you can create it in ASM as you would on any other filesystem.

SQL> connect sys/sys@prod1 as sysdba
Connected to an idle instance.
SQL> startup mount
ORACLE instance started.

SQL> alter database backup controlfile to '+DATA/cf2.dbf';

Database altered.

SQL> alter system set control_files='+DATA/cf1.dbf '
,'+DATA/cf2.dbf' scope=spfile;

System altered.

SQL> shutdown immediate;
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

SQL> select name from v$controlfile;

NAME
---------------------------------------
+DATA/cf1.dbf
+DATA/cf2.dbf

step 6:Migrate spfile to ASM:

Create a copy of the SPFILE in the ASM disk group.
In this example, the SPFILE for the migrated database will be stored as +DISK/spfile.

If the database is using an SPFILE already, then run these commands:

run {
BACKUP AS BACKUPSET SPFILE;
RESTORE SPFILE TO "+DISK/spfile";
}


If you are not using an SPFILE, then use CREATE SPFILE
from SQL*Plus to create the new SPFILE in ASM.
For example, if your parameter file is called /private/init.ora,
use the following command:

SQL> create spfile='+DISK/spfile' from pfile='/private/init.ora';



After successfully migrating all the data files
over to ASM, the old data files are no longer
needed and can be removed. Your single-instance
database is now running on ASM!