Jeff Davis <pg...@j-davis.com> writes: > As I said elsewhere in the thread, I'm not planning to introduce any > additional locking. There is already precedent in IndexOnlyNext.
Of course, that just begs the question of whether the code in IndexOnlyNext is correct. And after looking at it, it seems pretty broken, or at least the argument for its correctness is broken. That comment seems to consider only the case where the target tuple has just been inserted --- but what of the case where the target tuple is in process of being deleted? The deleter will not make a new index entry for that. Of course, there's a pretty long code path from marking a tuple deleted to committing the deletion, and it seems safe to assume that the deleter will hit a write barrier in that path. But I don't believe the argument here that the reader must hit a read barrier in between. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers