On Fri, Feb 20, 2015 at 3:52 PM, Andres Freund <and...@2ndquadrant.com> wrote: > On 2015-02-20 15:44:12 -0800, Peter Geoghegan wrote: >> On Thu, Feb 19, 2015 at 2:11 AM, Andres Freund <and...@2ndquadrant.com> >> wrote: >> > Yes. It'd be easiest if the only the final insert/update were actually >> > WAL logged as full actions. >> >> Well, that implies that we'd actually know that we'd succeed when WAL >> logging the speculative heap tuple's insertion. > > I don't think it does. It'd certainly be possible to simply only emit > the final WAL logging action once the insertion has actually > non-speculatively succeeded. We might decide against that for > eefficiency or complexity reasons, but it'd be far from impossible or > even ugly. We could even not log the actual values for the speculative > insertion - after all, those aren't needed if we crash halfway > through...
I think that that would be prohibitively complex and inefficient, though. No? I will concede that it's probably possible in principle, but that seems like a pretty academic point. -- Peter Geoghegan -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
