List hidden paramters in Oracle Database

You can get the hidden parameter values by querying x$ksppcv and x$ksppi as follows:

• select a.ksppinm name, b.ksppstvl value from sys.x$ksppi a,sys.x$ksppcv b where a.indx = b.indx and a.ksppinm=’_smm_max_size’;
• select a.ksppinm name, b.ksppstvl value from sys.x$ksppi a,sys.x$ksppcv b where a.indx = b.indx and a.ksppinm=’_pga_max_size’;