On 2014-04-01 12:56:04 -0500, Jim Nasby wrote: > On 3/4/14, 8:50 AM, Andres Freund wrote: > >Can't that be solved by just creating the permanent relation in a new > >relfilenode? That's equivalent to a rewrite, yes, but we need to do that > >for anything but wal_level=minimal anyway. > > Maybe I'm missing something, but doesn't this actually involve writing the > data twice? Once into WAL and again into the relation itself?
Yes. But as I said, that's unavoidable for anything but wal_level=minimal. If somebody wants to put in the additional nontrivial work to make it work faster with wal_level=minimal, they can do so. But the other case is more general and needs to be done anyway. 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
