Michael Paquier <michael.paqu...@gmail.com> writes:
> In short, autovacuum will need to scan by itself the VM of each
> relation and decide based on that.

That seems like a worthwhile approach to pursue.  The VM is supposed to be
small, and if you're worried it isn't, you could sample a few pages of it.
I do not think any of the ideas proposed so far for tracking the
visibility percentage on-the-fly are very tenable.

                        regards, tom lane

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