Dne 23.12.2011 22:37, Pavel Stehule napsal(a):
> 2011/12/23 Tom Lane<tgl(at)sss(dot)pgh(dot)pa(dot)us>:
>> Tomas Vondra<tv(at)fuzzy(dot)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
But that's the purpose of collecting row counts without timing data.
TL is asking about the opposite case - collecting timing data without
row counts. I can't imagine such use case ...
Tomas