2011/12/23 Tom Lane <tgl@sss.pgh.pa.us>:
> Pavel Stehule <pavel.stehule@gmail.com> writes:
>> 2011/12/23 Tom Lane <tgl@sss.pgh.pa.us>:
>>> Tomas Vondra <tv@fuzzy.cz> writes:
>>>> The motivation for this patch was that collection timing data often
>>>> causes performance issues and in some cases it's not needed. But is this
>>>> true for row counts?
>
>>> Perhaps more to the point, is there a use case for collecting timing
>>> data without row counts? I find it hard to visualize a valid reason.
>
>> yes - a searching of bad prediction
>
> No, because timing alone proves nothing at all. The machine could just
> have been overloaded.
sorry, I didn't understand to question.
Using only time is not practical
Regards
Pavel
>
> regards, tom lane