How to check hidden init DB parameters

how to check the implicit hidden init parameters such as "_disable_cell_optimized":

Use below sql:

select a.ksppinm "Parameter", b.ksppstvl "Session Value",
c.ksppstvl "Instance Value" from x$ksppi a, x$ksppcv b, x$ksppsv c
where a.indx = b.indx and a.indx = c.indx and a.ksppinm like '%_disable_cell_optimized%';