select
  group_number,                            -- GROUP_NUMBER NUMBER
  volume_name,                             -- VOLUME_NAME VARCHAR2(30)
  compound_index,                          -- COMPOUND_INDEX NUMBER
  volume_number,                           -- VOLUME_NUMBER NUMBER
  reads,                                   -- READS NUMBER
  writes,                                  -- WRITES NUMBER
  read_errs,                               -- READ_ERRS NUMBER
  write_errs,                              -- WRITE_ERRS NUMBER
  read_time,                               -- READ_TIME NUMBER
  write_time,                              -- WRITE_TIME NUMBER
  bytes_read,                              -- BYTES_READ NUMBER
  bytes_written                            -- BYTES_WRITTEN NUMBER
from
  gv$asm_volume_stat
where
  inst_id = USERENV('Instance')