aux_stats$ stores collected auxiliary system statistics (dbms_stats.gather_system_stats) to be consumed by the optimizer. sname contains the name of set of parameters pname contains the name of parameter pval1 stores the parameter value in number, pval2 in character format. begin
dbms_stats.gather_system_stats('start');
… do stuff …
dbms_stats.gather_system_stats('stop' );
end;
/