select
  BEGIN_TIME,                              -- BEGIN_TIME DATE
  END_TIME,                                -- END_TIME DATE
  FLASHBACK_DATA,                          -- FLASHBACK_DATA NUMBER
  DB_DATA,                                 -- DB_DATA NUMBER
  REDO_DATA,                               -- REDO_DATA NUMBER
  ESTIMATED_FLASHBACK_SIZE                 -- ESTIMATED_FLASHBACK_SIZE NUMBER
from
  GV$FLASHBACK_DATABASE_STAT
where
  inst_id = USERENV('Instance')