Marko,
But Tom's mail gave me impression core wants to wait until we get "perfect" read-only slave implementation so we wait with it until 8.6, which does not seem sensible. If we can do slightly inefficient (but simple) implementation right now, I see no reason to reject it, we can always improve it later.
That's incorrect. We're looking for a workable solution. If we could get one for 8.4, that would be brilliant but we think it's going to be harder than that.
Publishing the XIDs back to the master is one possibility. We also looked at using "spillover segments" for vacuumed rows, but that seemed even less viable.
I'm also thinking, for *async replication*, that we could simply halt replication on the slave whenever a transaction passes minxid on the master. However, the main focus will be on synchrounous hot standby.
--Josh -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
