About the value of the parameter for me is true, why is false in your instance, I didn't change it? Oracle 10.2.0.2.0 select nam.indx+1 numb, nam.ksppinm name, val.ksppstvl value, nam.ksppity type, val.ksppstdf is_default, decode(bitand(nam.ksppiflg/256,1), 1,'True', 'False' ) is_session_modifiable, decode(bitand(nam.ksppiflg/65536,3), 1,'Immediate', 2,'Deferred' , 3,'Immediate', 'False' ) is_system_modifiable, decode(bitand(val.ksppstvf,7), 1,'Modified', 4,'System Modified', 'False' ) is_modified, decode(bitand(val.ksppstvf,2), 2,'True', 'False' ) is_adjusted, nam.ksppdesc description from x$ksppi nam, x$ksppsv val where nam.indx = val.indx and nam.ksppinm = '_kks_use_mutex_pin' ;