Camilo Porto <[EMAIL PROTECTED]> writes:
> The problem I have encountered is that the sum of executor's
> duration time is, *sometimes*, bigger than the total time interval in
> which the statements had been executed!! And this makes no sense!

Umm ... why not?  If you have, say, two queries executing in parallel
for 1 second, they'll each report a duration: of 1 second, thus summing
to 2 seconds, but the elapsed time was only 1 second.

If you don't see that always, then your benchmark program isn't trying
very hard to run more than one query in parallel ...

                        regards, tom lane

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