Просмотр значений параметров БД : Oracle

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 ksppinm = 'sql_trace'
order by a.ksppinm;