> > Yes. But I think you might have to avoid "vacuum full" during data file backup.
>
> Why? If vacuum is unsafe in this scenario, wouldn't it also be unsafe
> in event of a system crash?
I was not sure we are 100% crash safe during "vacuum full".
But yes, now recalling your last remark on a crash during vacuum full
I guess we should be.
> I do believe that vacuum should (but presently does not) emit a WAL
> record showing its truncation of the file, so that the equivalent
> truncation can be repeated during replay.
> However, this is needed in any case.
I see, but it has only the effect of not freeing the space to the OS,
so it is not really a bug ? Next vacuum will do it anyway.
Andreas
