2011/12/23 Tom Lane <t...@sss.pgh.pa.us>:
> Pavel Stehule <pavel.steh...@gmail.com> writes:
>> 2011/12/23 Tom Lane <t...@sss.pgh.pa.us>:
>>> Tomas Vondra <t...@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, tom lane

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