On Wed, 27 Jan 2016 23:54:37 +0100 Ivan Voras <ivoras@gmail.com> wrote: > So, question #1: WTF? How could this happen, on a regularly vacuumed > system? Shouldn't the space be reused, at least after a VACUUM? The issue > here is not the absolute existence of the bloat space, it's that it's > constantly growing for *system* tables.
With a lot of activity, once a day probably isn't regular enough.
I sort of see what you are saying. I'm curious, though, what goes wrong with the following list of expectations:
Day-to-day load is approximately the same
So, at the end of the first day there will be some amount of bloat
Vacuum will mark that space re-usable
Within the next day, this space will actually be re-used
... so the bloat won't grow.
Basically, I'm wondering why is it growing after vacuums, not why it exists in the first place?