On Thu, 2007-03-01 at 14:35 +0100, Zeugswetter Andreas ADI SD wrote:
> > -- start the VACUUM from the first non-filled block
> >
> > So if we do this, we wouldn't need to worry about HOT tuples
> > at all, nor would we need to wait until all transactions are gone.
>
> You need to wait until you are allowed to truncate if you want
> concurrency.
> Or a concurrent scan might miss a row, because the visible tuple got
> truncated away.
I was not suggesting that we remove visible rows through truncation.
--
Simon Riggs
EnterpriseDB http://www.enterprisedb.com