x$kqfta (kernel query fixed-view table) shows the names of the fixed tables.
select
tab.kqftanam x_table,
fob.flags fob_flabgs,
fob.timestamp - date '1991-01-01' same_as_kqftaver,
tab.kqftaver,
tab.kqftatyp,
tab.kqftaflg,
tab.kqftacoc,
opt.kqfoptflags,
tab.kqftarsz,
tab.kqftaobj,
count(*) over (partition by tab.kqftanam) c
from
x$kqfta tab left join
x$kqfopt opt on tab.kqftaobj = opt.kqfoptobj left join
fixed_obj$ fob on tab.kqftaobj = fob.obj#
order by
c desc,
x_table;