On Tue, Jan 10, 2023 at 11:47 AM Peter Geoghegan <p...@bowt.ie> wrote: > In summary, I think that there is currently no way that we can have > the VM (or the PD_ALL_VISIBLE flag) concurrently unset, while leaving > the page all_frozen. It can happen and leave the page all_visible, but > not all_frozen, due to these very fine details. (Assuming I haven't > missed another path to the problem with aborted Multis or something, > but looks like I haven't.)
Actually, FreezeMultiXactId() can fully remove an xmax that has some member XIDs >= OldestXmin, provided FRM_NOOP processing isn't possible, at least when no individual member is still running. Doesn't have to involve transaction aborts at all. Let me go try to break it that way... -- Peter Geoghegan
