On Wed, Apr 17, 2013 at 06:33:58PM +0200, Florian Pflug wrote: > > I was going to ask about the flexibility of pg_upgrade and checksums. > > Right now you have to match the old and new cluster checksum modes, but > > it seems it would be possible to allow pg_upgrade use from checksum to > > no-checksum servers. Does the backend look at the pg_controldata setting, > > or at the page checksum flag? If the former, it seems pg_upgrade could > > run a a no-checksum server just fine that had checksum information on > > its pages. This might give us more flexibility in changing the checksum > > algorithm in the future, i.e. you only lose checksum ability. > > AFAIK, there's currently no per-page checksum flag. Still, being only > able to go from checksummed to not-checksummed probably is for all > practical purposes the same as not being able to pg_upgrade at all. > Otherwise, why would people have enabled checksums in the first place?
Good point, but it is _an_ option, at least. I would like to know the answer of how an upgrade from checksum to no-checksum would behave so I can modify pg_upgrade to allow it. -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
