Re: Anyone care to vet / explain this test result?

That was it. Thanks, all.

On Tue, 16 Mar 2004 15:56:57 -0500, "Bib Endum" <gd-newsgroups_at_spamex.com> wrote:

>
>"Ed Stevens" <nospam_at_noway.nohow> a écrit dans le message de
>news:ogle50pj2bis1me3tpj340et1dra5j07t8_at_4ax.com...
>> Platform: Oracle 8.1.7 on Win2k
>>
>[Snip]
>>
>> Here, we have a clear preference for the Key_Last table. The first
>> set of tests is what I would expect, with no clear pattern; this
>> definite pattern in the second test seems rather bizarre. Does anyone
>> have an explanation for this?
>>
>
>Hum, very strange. Notice how the FIRST loop iteration (with the loop
>version) gives you results similar to individual runs...
>
>Look at you "i" variable, it's initialized OUTSIDE of the x loop ONCE. You
>do not re-init it IN the loop for subsequent loops, therefor doubling your
>times.
>
>Correct would be:
>
>DECLARE
> i PLS_INTEGER;
> x PLS_INTEGER;
> kf_tme char(7);
> kl_tme char(7);
> s EDS_TEST_KEY_FIRST.clm_key%TYPE;
> rn PLS_INTEGER;
>BEGIN
> SELECT COUNT(*)
>INTO rn
> FROM EDS_TEST_KEY_FIRST;
>
> dbms_output.put_line('Key First Key Last');
>
> for x in 1 .. 20
> loop
>
> i := dbms_utility.get_time(); -- GD FIX !!!!!!
>
> FOR i IN REVERSE 1 .. rn
> LOOP
> SELECT clm_key
> INTO s
> FROM EDS_TEST_KEY_FIRST
> WHERE SUPL_KEY = i;
> END LOOP;
>
> kf_tme := to_char(dbms_utility.get_time()-i);
>
> i := dbms_utility.get_time();
>
> FOR i IN REVERSE 1 .. rn
> LOOP
> SELECT clm_key
> INTO s
> FROM EDS_TEST_KEY_LAST
> WHERE SUPL_KEY = i;
> END LOOP;
>
> kl_tme := to_char(dbms_utility.get_time()-i);
>
> dbms_output.put_line(kf_tme || ' ' || kl_tme);
> END LOOP;
>END;
>/
>
Received on Wed Mar 17 2004 - 09:29:35 CST