Re: [HACKERS] Allowing WAL fsync to be done via O_SYNC

[Tom Lane]

Alfred Perlstein <[EMAIL PROTECTED]> writes:
> And since we're sorta on the topic of IO, I noticed that it looks
> like (at least in 7.0.3) that vacuum and certain other routines
> read files in reverse order.

Vacuum does that because it's trying to push tuples down from the end
into free space in earlier blocks.  I don't see much way around that
(nor any good reason to think that it's a critical part of vacuum's
performance anyway).  Where else have you seen such behavior?

                        regards, tom lane

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