set up a standby quickly by duplicate.
1.Create an Oracle Password File for the Auxiliary Instance
Password of user sys must be the same as primary side,so i copy the password file from primary,otherwise,you will get an error like:
 ORA-16191: Primarylog shipping client not logged on standby
2.Ensure Oracle Net Connectivity to the Auxiliary Instance
dramaticly configure linster on standby(Auxiliary) side like:.
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = O02DMS3)
      (ORACLE_HOME = /dms01/app/oracle)
      (GLOBAL_NAME = O02DMS3)
    )
  )

verify the connection from primary to standby.
example:sqlplus  sys/123@O02DMS3DR as sysdba 
3.Create an Initialization Parameter File for the Auxiliary Instance
*.compatible='10.2.0.2.0'
*.control_files='/dms01/app/dump/controldr.ctl'
*.db_name='O02DMS3'
LOG_FILE_NAME_CONVERT=('+DG01/dms','/dms01/app/data/O02DMS3')
4.Start the Auxiliary Instance with the server parameter file
 create spfile from pfile;startup force nomount
5.backup database and controlfile on primary sid by rman ,and then copy all those to standby on the same directory.
ALTER DATABASE CREATE STANDBY CONTROLFILE AS '/dms01/app/dump/rman/controldr.ctl';
6.Creating a Duplicate Database
rman TARGET/    AUXILIARY SYS/123@O02DMS3DR
RUN
{ SET NEWNAME FOR DATAFILE 1 TO '/dms01/app/data/O02DMS3/system01.dbf';
  SET NEWNAME FOR DATAFILE 2 TO '/dms01/app/data/O02DMS3/undotbs01.dbf';
  SET NEWNAME FOR DATAFILE 3 TO '/dms01/app/data/O02DMS3/sysaux01.dbf';
  SET NEWNAME FOR DATAFILE 4 TO '/dms01/app/data/O02DMS3/users01.dbf';
  SET NEWNAME FOR DATAFILE 5 TO '/dms01/app/data/O02DMS3/undotbs02.dbf';
  DUPLICATE TARGET DATABASE  FOR STANDBY NOFILENAMECHECK;
 }
 
log:
executing command: SET NEWNAME
using target database control file instead of recovery catalog

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

Starting Duplicate Db at 30-APR-12
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: sid=157 devtype=DISK

contents of Memory Script.:
{
   restore clone standby controlfile;
   sql clone 'alter database mount standby database';
}
executing Memory Script

Starting restore at 30-APR-12
using channel ORA_AUX_DISK_1

channel ORA_AUX_DISK_1: restoring control file
channel ORA_AUX_DISK_1: copied control file copy
input filename=/dms01/app/dump/rman/controldr.ctl
output filename=/dms01/app/dump/controldr.ctl
Finished restore at 30-APR-12

sql statement: alter database mount standby database
released channel: ORA_AUX_DISK_1

contents of Memory Script.:
{
   set newname for tempfile  1 to
 "+DG01/dms/temp01.dbf";
   switch clone tempfile all;
   set newname for datafile  1 to
 "/dms01/app/data/O02DMS3/system01.dbf";
   set newname for datafile  2 to
 "/dms01/app/data/O02DMS3/undotbs01.dbf";
   set newname for datafile  3 to
 "/dms01/app/data/O02DMS3/sysaux01.dbf";
   set newname for datafile  4 to
 "/dms01/app/data/O02DMS3/users01.dbf";
   set newname for datafile  5 to
 "/dms01/app/data/O02DMS3/undotbs02.dbf";
   restore
   check readonly
   clone database
   ;
}
executing Memory Script

executing command: SET NEWNAME

renamed temporary file 1 to +DG01/dms/temp01.dbf in control file

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

Starting restore at 30-APR-12
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: sid=156 devtype=DISK

channel ORA_AUX_DISK_1: starting datafile backupset restore
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
restoring datafile 00001 to /dms01/app/data/O02DMS3/system01.dbf
restoring datafile 00002 to /dms01/app/data/O02DMS3/undotbs01.dbf
restoring datafile 00003 to /dms01/app/data/O02DMS3/sysaux01.dbf
restoring datafile 00004 to /dms01/app/data/O02DMS3/users01.dbf
restoring datafile 00005 to /dms01/app/data/O02DMS3/undotbs02.dbf
channel ORA_AUX_DISK_1: reading from backup piece /dms01/app/dump/rman/bp_05n9o9                                                                                        ur_1_1_O02DMS3
channel ORA_AUX_DISK_1: restored backup piece 1
piece handle=/dms01/app/dump/rman/bp_05n9o9ur_1_1_O02DMS3 tag=TAG20120430T181554
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:03:17
Finished restore at 30-APR-12

contents of Memory Script.:
{
   switch clone datafile all;
}
executing Memory Script

datafile 1 switched to datafile copy
input datafile copy recid=6 stamp=781989236 filename=/dms01/app/data/O02DMS3/sys                                                                                        tem01.dbf
datafile 2 switched to datafile copy
input datafile copy recid=7 stamp=781989236 filename=/dms01/app/data/O02DMS3/und                                                                                        otbs01.dbf
datafile 3 switched to datafile copy
input datafile copy recid=8 stamp=781989236 filename=/dms01/app/data/O02DMS3/sys                                                                                        aux01.dbf
datafile 4 switched to datafile copy
input datafile copy recid=9 stamp=781989236 filename=/dms01/app/data/O02DMS3/use                                                                                        rs01.dbf
datafile 5 switched to datafile copy
input datafile copy recid=10 stamp=781989236 filename=/dms01/app/data/O02DMS3/un                                                                                        dotbs02.dbf
Finished Duplicate Db at 30-APR-12

RMAN> exit

7.verify the role on both side.

standby:
SQL> select INST_ID,database_role from gv$database;

   INST_ID DATABASE_ROLE
---------- ----------------
         1 PHYSICAL STANDBY

PRIMARY:
SQL> select INST_ID,database_role from gv$database;

   INST_ID DATABASE_ROLE
---------- ----------------
         1 PRIMARY

8.setting Parameters
primary side:
alter system set log_archive_config='DG_CONFIG=(DMS,O02DMS3DR)' scope=both  sid='*';
alter system set LOG_ARCHIVE_DEST_2='SERVICE=O02DMS3DR VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=O02DMS3 LGWR ASYNC' scope=both sid='*';
 
standby side:
alter system set log_archive_config='DG_CONFIG=(DMS,O02DMS3DR)' scope=both  sid='*';--don't miss it ,otherwise it will raise an error like:
ORA-16047: DGID mismatch between destination setting and standby

9.startup mrp and active log transport service.

ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;
perform. it on standby.

keep an eye on alert logfile.

alter system set log_archive_dest_state_2=defer;
alter system set log_archive_dest_state_2=enable;

col DEST_NAME for a30;
 set linesize 200;
 select DEST_NAME,STATUS,PROTECTION_MODE,ERROR from V$ARCHIVE_DEST_STATUS;
perform. it on primary.