SQL> create table t (n number)
  2  /

Table created.

SQL> declare
  2    start_time number;
  3  begin
  4    start_time := dbms_utility.get_time;
  5    for i in 0..999 loop
  6  	 insert into t values (i);
  7    end loop;
  8    commit;
  9    dbms_output.put_line(dbms_utility.get_time - start_time || ' centiseconds');
 10  end;
 11  /
44 centiseconds                                                                 

PL/SQL procedure successfully completed.

SQL> truncate table t
  2  /

Table truncated.

SQL> declare
  2    start_time number;
  3  begin
  4    start_time := dbms_utility.get_time;
  5    for i in 0..999 loop
  6  	 insert into t values (i);
  7  	 commit;
  8    end loop;
  9    dbms_output.put_line(dbms_utility.get_time - start_time || ' centiseconds');
 10  end;
 11  /
102 centiseconds                                                                

PL/SQL procedure successfully completed.

SQL> exit