> > I think it is a good idea to backup pg_log first, then the rest.
> > Then you should imho be safe even if load is heavy.
> > No vacuum until finished of course.
>
> You know, that was always my assumption too, that doing pg_log first
> made things safer. I am not sure if it is 100% safe, though.
I think there is a problem with our "big" pagesize of 8k.
If we used the system page size (usually 2 or 4k) a write with a
concurrent read should imho not be possible. But since we need to write
2-4 system pages I am not so sure that that is atomic, thus we risc
backing up an incompletely written pg page.
sounds like a nogo :-(
Andreas