============= STANDBY BACKUP ======================== 
ON PRIMARY:
if don't have access to rman, create rman
sqlplus sys
 SQL> create user rman identified by rman;
 SQL> alter user rman default tablespace system temporary tablespace temp;
 SQL> alter user rman quota unlimited on system;
 SQL> grant connect, resource, recovery_catalog_owner to rman;
 SQL> exit;
create catalogue
  rman catalog rman/rman
  RMAN> create catalog tablespace system;
  RMAN> exit;
register database
  rman catalog rman/rman target /
  RMAN> rman TARGET sys/oracle CATALOG rman/rman 

ON PRIMARY:
database needs to be in archlog mode 
choose a backup directory with enough space in my case /fuji_d0
backup database with rman:
  rman target /
  RMAN> BACKUP CURRENT CONTROLFILE FOR STANDBY FORMAT '/fuji_d0/PRIMARY/%d_C_%U';
  RMAN> BACKUP FORMAT '/fuji_d0/PRIMARY/%d_D_%T_%u_s%s_p%p' DATABASE;
copy files to same directory location on duplicate
copy all the archive redo across as well

ON STANDBY:
Create password file
  $ORACLE_HOME/bin/orapwd  file=$ORACLE_HOME/dbs/orapw$ORACLE_SID password=oracle 
  sqlplus "/ as sydba"
  sql> startup nomount
startup listener

ON PRIMARY:
duplicate in standby  mode
  # have an entry in tnsnames.ora for duplicate database "DUP"
  rman TARGET sys/oracle CATALOG rman/rman AUXILIARY sys/oracle@DUP
  RMAN> DUPLICATE TARGET DATABASE FOR STANDBY DORECOVER NOFILENAMECHECK;

ON STANDBY:
make sure log_archive_dest is the location where you copied
make sure log_archive_format is same as primary
the arch redo log from the primary to
put in standby recover mode
  sqlplus "/ as sysdba"
    SQL> SHUTDOWN IMMEDIATE
    SQL> STARTUP NOMOUNT
    SQL> ALTER DATABASE MOUNT STANDBY DATABASE;
    SQL> -- recover standby database;
    SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;
    SELECT process,status,block#,sequence# FROM v$managed_standby;
    

ON PRIMARY:
  sqlplus "/ as sysdba"
  SQL> ALTER SYSTEM ARCHIVE LOG CURRENT ;

ON STANDBY:
Open Standby with
    SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
    SQL> shutdown immediate;
    SQL> STARTUP NOMOUNT
    SQL> ALTER DATABASE MOUNT STANDBY DATABASE;
    SQL> alter database activate standby database;
    SQL> alter database mount;
    SQL> alter database open;