Merlin Moncure wrote: > n 2/6/07, Alvaro Herrera <alvherre@xxxxxxxxxxxxxxxxx> wrote: > >Merlin Moncure wrote: > > > >> ya, it doesn't seem to match, as this seems to be repeating quite > >> regularly. interesting that my 'clog' files start at 06B6 and count > >> up. 0207 is way off the charts. > >> > >> a lot of applications are hitting this database, and so far everything > >> seems to be running ok (i found this log msg by accident), but I am > >> now officially very nervous. > > > >I don't think there's much cause for concern here. If my theory is > >correct, this is an autovacuum bug which was fixed in 8.1.7. > > > >What I'd do is create a 0207 clog file, fill it with 0x55 (which is > >"transactions committed" for all transactions in that interval), and do > >a VACUUM FREEZE on that database. You'll need to set > >pg_database.datallowconn=true beforehand. > > > >Of course, I'd copy the files somewhere else and experiment on a scratch > >postmaster, running on a different port, just to be sure ... > > thats a big help, database is actually fairly huge, so I may have to > just go ahead and do it. I'm off to a meeting, but I'll check back > when I'm done and assuming nobody else says 'don't do that', I'll try > the fix and post back with the result. Well, you don't need to copy all databases for the test area, just the base/<oid> dir for template0 (along with all pg_xlog and pg_clog files, etc, but these shouldn't be as big as all the other stuff in base/). -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc.
