How to check the setting of all hidden parameters
Run the following from an SQL*Plus session (connected as SYS):
ttitle – center ‘All Instance Parameters’ skip 2
col ksppinm  format a28 heading ‘Parameter’ justify c trunc
col ksppstvl format a40 heading ‘Value’    justify c trunc
col ksppstdf format a8 heading ‘Default?’ justify c trunc
select
a.ksppinm,
b.ksppstvl,
b.ksppstdf
from
x$ksppi a, x$ksppcv b
where a.indx = b.indx
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order by a.ksppinm;
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