"Abraham, Danny" <danny_abraham(at)bmc(dot)com> writes:
> Slow machine, high stress.
> I think/hope that PG is the victim of an overstressed machine.
> Has anyone faced this issue in the past?
Not to point out the obvious, but you're evidently using parallel
queries, which was a brand new thing in 9.5; and it had its share
of teething problems. I can't say whether updating to current
(9.5.22) would fix this particular issue, but it would definitely
fix a bunch of instabilities in that general area.
regards, tom lane