Greg Stark wrote:
>
> That's what I want to believe. But picture if you have, say a
> 1-terabyte table which is 50% dead tuples and you don't have a spare
> 1-terabytes to rewrite the whole table.
Could one hypothetically do update bigtable set pk = pk where ctid in (select ctid from bigtable order by ctid desc
limit100); vacuum;
and repeat until max(ctid) is small enough?
Sure, it'll take longer than vacuum full; but at first glance
it seems lightweight enough to do even on a live, heavily accessed
table.
IIRC I tried something like this once, and it worked to some extent,
but after a few loops didn't shrink the table as much as I had expected.
