GV$CLASS_CACHE_TRANSFER

select
inst_id,                 -- INST_ID NUMBER
decode                   -- CLASS VARCHAR2(18)
  (indx, 1, 'data block', 2, 'sort block', 3, 'save undo block', 4, 'segment header', 5, 'save undo header', 6, 'free list', 7, 'extent map', 8, '1st level bmb', 9, '2nd level bmb', 10, '3rd level bmb', 11, 'bitmap block', 12, 'bitmap index block', 13, 'unused', 14, 'undo header', 15, 'undo block'),
CLASS_X2NC,              -- X_2_NULL NUMBER
CLASS_X2NFWC,            -- X_2_NULL_FORCED_WRITE NUMBER
CLASS_X2NFSC,            -- X_2_NULL_FORCED_STALE NUMBER
CLASS_X2SC,              -- X_2_S NUMBER
CLASS_X2SFWC,            -- X_2_S_FORCED_WRITE NUMBER
CLASS_S2NC,              -- S_2_NULL NUMBER
CLASS_S2NFSC,            -- S_2_NULL_FORCED_STALE NUMBER
CLASS_N2XC,              -- NULL_2_X NUMBER
CLASS_S2XC,              -- S_2_X NUMBER
CLASS_N2SC               -- NULL_2_S NUMBER
from
x$class_stat
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