Count the numbers of cache buffers chains and cache buffers lru chainslatches:
select
count(*) cnt,
name
from
v$latch_children
where
name like 'cache buffers %'
group by
name;
Check value of hidden parameter _db_block_hash_latches (Number of database block hash latches). It should correspond to count(*) of cache buffers chain:
select
v.ksppstvl value_v,
v.ksppstdfl default_value_v,
w.ksppstvl value_w,
w.ksppstdfl default_value_w
from
x$ksppi par join
x$ksppcv v on par.indx = v.indx join
x$ksppsv w on par.indx = w.indx
where
par.ksppinm = '_db_block_hash_latches';