sqlplus scott/aaaaaa
create table test_abc(id int);
insert into test_abc select level from dual connect by level<=1000000;  
commit;
exit

sqlplus scott/aaaaaa
alter session set tracefile_identifier='10046_lei_highgo';
alter session set timed_statistics = true;
alter session set statistics_level=all;
alter session set max_dump_file_size = unlimited;
alter session set events '10046 trace name context forever,level 12';
select * from  test_abc where rownum<100;
Alter session set events '10046 trace name context off';

tkprof ecton1_ora_20829_10046_lei_highgo.trc  20829_10046_lei_highgo.output