alter session set NLS_DATE_FORMAT='YYYY-MM-DD HH24:MI:SS';

drop table u0.t0 purge;
create table u0.t0(d date);

declare

  i integer;
  maxi integer default 10000000;


begin
  for i in 1..maxi loop
    begin
      insert into u0.t0 values (sysdate);
      commit;
      sys.dbms_session.sleep(1);
    end;
  end loop;
end;
/