V$FILE_OPTIMIZED_HISTOGRAM definition in Oracle Database 11.2
V$FILE_OPTIMIZED_HISTOGRAM
select
FILE#, -- FILE# NUMBER
SINGLEBLKRDTIM_MICRO, -- SINGLEBLKRDTIM_MICRO NUMBER
SINGLEBLKRDS -- SINGLEBLKRDS NUMBER
from
GV$FILE_OPTIMIZED_HISTOGRAM
where
inst_id = USERENV('Instance')