GV$WAITSTAT

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, 'bitmap block', 9, 'bitmap index block', 10, 'unused', 11, 'system undo header', 12, 'system undo block', 13, 'undo header', 14, 'undo block'),
count,                   -- COUNT NUMBER
time                     -- TIME NUMBER
from
x$kcbwait 
where
indx!=0
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