Florian Pflug <f...@phlo.org> writes:
> The subtle point here is whether you consider the view from the "outside" (in
> the sense of what a read-only transaction started at an arbitrary time can or
> cannot observe), or from the "inside" (what updating transactions can observe
> and might base their updates on).
> The former case is completely determined by the commit ordering of the
> transactions, while the latter is not - otherwise serializability wouldn't be
> such a hard problem.
BTW, doesn't all this logic fall in a heap as soon as you consider
read-committed transactions?
regards, tom lane
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