Source and target database are on same machine. mostly steps are same if source and duplicate database are different server. in that case you need to generate entry in tnsnames, create init file on both server.

Source database (RAC) – db11g

Duplicate database (SINGLE and then convert to RAC)  – copy11g

Create static listener on node 1 of destination servers

vi /u01/oracle/ora11204/network/admin/listener.ora

SID_LIST_static_lsnr =
(SID_LIST =
(SID_DESC =
(ORACLE_HOME = /u01/oracle/ora11204)
(SID_NAME = copy11g)
(GLOBAL_NAME = copy11g.wikidba.com)
)
)

lsnrctl start static_lsnr

lsnrctl status static_lsnr

Add entry in TNSNAMES.ora

vi /u01/oracle/ora11204/network/admin/tnsnames.ora

db11g_SRC.wikidba.com =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = node1.wikidba.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SID = db11g_1)
)
)

db11g_DUP.wikidba.com =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = node1.wikidba.com)(PORT = 1522))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SID = copy11g)
)
)

Create init.ora on both servers in the same location

## On node1.wikidba.com logged in as oracle
$ vi /u01/oracle/ora11204/dbs/initcopy11g.ora

db_name=’copy11g’
db_unique_name=’copy11g’
audit_file_dest=’/acfs_mnt/audit’
diagnostic_dest=’/acfs_mnt’
audit_trail = DB
db_securefile = ALWAYS
nls_length_semantics = CHAR
open_cursors=600
processes=2000
sessions=2000
DB_CREATE_FILE_DEST=’+ORADATA1′
DB_RECOVERY_FILE_DEST=’+ORAFRA1′
DB_RECOVERY_FILE_DEST_SIZE=10G
log_archive_dest_1=’LOCATION=+ORADATA1 REOPEN=60′
cluster_database=’false’
compatible=’11.2.0.4.0′
memory_max_target=5G
memory_target=5G

Copy orapw file from node1 to node1 or create new one

$ cp /u01/oracle/ora11204/dbs/orapwdb11g /u01/oracle/ora11204/dbs/orapwcopy11g

OR

orapwd file=$ORACLE_HOME/dbs/orapwdb11g entries=30

Startup new instance in nomount on node1

$ vi /etc/oratab
copy11g:/u01/oracle/ora11204:N

. oraenv
ORACLE_SID = [copy11g] ? copy11g

export ORACLE_SID=copy11g

$ echo $ORACLE_HOME $ORACLE_SID

/u01/oracle/ora11204 copy11g

sqlplus / as sysdba

startup nomount PFILE=’/u01/oracle/ora11204/dbs/initcopy11g.ora’

Duplicate database using RMAN

export NLS_DATE_FORMAT=”DD-MON-YYYY HH24:MI:SS”

rman target sys@db11g_SRC.wikidba.com  auxiliary sys@db11g_DUP.wikidba.com
set echo on
run {

allocate channel tgt1 device type disk;
allocate auxiliary channel aux1 device type disk;
duplicate target database to copy11g from active database
nofilenamecheck
pfile = /u01/oracle/ora11204/dbs/initcopy11g.ora;

}

shutdown immediate;

Additional task

Remove hidden parameter and deprecated parameter from initfile and spfile. create spfile from init file if needed. this is due to bug.

startup;

Delete Service Names of source database in duplicate database

set pages 0
select ‘exec dbms_service.delete_service(”’||name||”’);’ from dba_services where name not in ( ‘db11g’, ‘SYS$BACKGROUND’, ‘SYS$USERS’);