ALTER SESSION SET TRACEFILE_IDENTIFIER = 'my_trace_';
alter session set sql_trace=true;
select count(*) from sh.TOKEI;
alter session set sql_trace=false;
tkprof orcl_ora_12339_my_trace_.trc orcl_ora_12339_my_trace_.txt sys=no
cat orcl_ora_12339_my_trace_.txt