Query to Check RMAN backup

 Following Query is used to check rman backup:

set lines 200 pages 200
col STATUS format a15
col hrs format 999.99
col start_time for a15
col INPUT_TYPE for a12
col END_TIME for a15
select
SESSION_KEY,SESSION_RECID,SESSION_STAMP ,INPUT_TYPE, STATUS,
to_char(START_TIME,'mm/dd/yy hh24:mi') start_time,
to_char(END_TIME,'mm/dd/yy hh24:mi') end_time,
elapsed_seconds/3600 hrs,
OUTPUT_DEVICE_TYPE
from V$RMAN_BACKUP_JOB_DETAILS
order by 1;

Put session_recid and session_stamp from above query and you will get log for that RMAN backup:

set lines 200
set pages 1000
select output
from GV$RMAN_OUTPUT
where session_recid =11038
and session_stamp =1070757497
order by recid;