V$RMAN_BACKUP_TYPE definition in Oracle Database 11.2
V$RMAN_BACKUP_TYPE

select
  9,                                       -- WEIGHT NUMBER
  'DB FULL'                                -- INPUT_TYPE VARCHAR2(13)
from
  dual
union
select
  8,                                       -- WEIGHT NUMBER
  'RECVR AREA'                             -- INPUT_TYPE VARCHAR2(13)
from
  dual
union
select
  7,                                       -- WEIGHT NUMBER
  'DB INCR'                                -- INPUT_TYPE VARCHAR2(13)
from
  dual
union
select
  6,                                       -- WEIGHT NUMBER
  'DATAFILE FULL'                          -- INPUT_TYPE VARCHAR2(13)
from
  dual
union
select
  5,                                       -- WEIGHT NUMBER
  'DATAFILE INCR'                          -- INPUT_TYPE VARCHAR2(13)
from
  dual
union
select
  4,                                       -- WEIGHT NUMBER
  'ARCHIVELOG'                             -- INPUT_TYPE VARCHAR2(13)
from
  dual
union
select
  3,                                       -- WEIGHT NUMBER
  'CONTROLFILE'                            -- INPUT_TYPE VARCHAR2(13)
from
  dual
union
select
  2,                                       -- WEIGHT NUMBER
  'SPFILE'                                 -- INPUT_TYPE VARCHAR2(13)
from
  dual
union
select
  1,                                       -- WEIGHT NUMBER
  'BACKUPSET'                              -- INPUT_TYPE VARCHAR2(13)
from
  dual

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