spo load.log
prompt '**** load data ****'
set termout off
@@inserts.sql
commit;
set termout on
prompt '**** done ****'
spo off
exit;

set serveroutput on
variable n number
exec :n := dbms_utility.get_time

exec :n := (dbms_utility.get_time - :n)/100
exec dbms_output.put_line(:n)

timing start timing_name

timing stop

SQL> set timing on
SQL> select 1 from dual;

         1
----------
         1

1 row selected.

Elapsed: 00:00:00.00
SQL>

time sqlplus @inserts.sql

real    0m9.34s
user    0m2.03s
sys     0m1.02s

--Beginning of all SQL scripts:
set serveroutput on feedback on echo on verify on sqlblanklines on timing on define on
col time new_v v_time
col name new_v v_name
col user new_v v_user

select name, USER, to_char(sysdate, 'YYYYMMDD-HH24MISS') time  from v$database;

--Creates a new log file every time the script is run, and it's immediately
--obvious when it was run, which environment it ran in, and who ran it.
spool &v_time._&v_name._&v_user..log

--Run the select again so it appears in the log file itself
select name, USER, to_char(sysdate, 'YYYYMMDD-HH24MISS') time  from v$database;

--End of all SQL scripts:
select name, USER, to_char(sysdate, 'YYYYMMDD-HH24MISS') time  from v$database;
spool off