On 2013-12-18 13:46:59 +0200, Heikki Linnakangas wrote: > On 12/18/2013 01:39 PM, Andres Freund wrote: > >On 2013-12-18 13:07:51 +0200, Heikki Linnakangas wrote: > >>Here's another idea that doesn't involve SSI: > >> > >>At COMMIT, take a new snapshot and check that the assertion still passes > >>with that snapshot. > >>I think that would work, and would be simple, although it wouldn't scale too > >>well. > > > >It probably would also be very prone to deadlocks. > > Hmm, since this would happen at commit, you would know all the assertions > that need to be checked at that point. You could check them e.g in Oid order > to avoid deadlocks.
I think real problem are the lock upgrades, because eventual DML will have acquired less heavy locks. Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
