On Thu, Jun 16, 2016 at 12:54 PM, Andres Freund <and...@anarazel.de> wrote: >> The root of my confusion is: if we prune a tuple, we'll bump the page >> LSN, so any session that is still referencing that tuple will error >> out as soon as it touches the page on which that tuple used to exist. > > Right. On the main table. But we don't peform that check on the toast > table/pages. So if we prune toast tuples, which are still referenced by > (unvacuumed) main relation, we can get into trouble.
OK, if it's true that we don't perform that check on the TOAST table, then I agree there's a potential problem there. I don't immediately know where in the code to look to check that. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers