Simon Riggs escreveu: > On Tue, 2009-01-27 at 13:06 +0100, Zdenek Kotala wrote: > >> Space reservation MUST TO be implemented if we >> want to have 8.4->8.5 upgrade. > > Why not just add a few dummy columns onto each catalog table? If we need > space to expand a row we can just drop one of the dummy columns from the > new catalog definition. > The problem is: how much space do we need at each catalog table? Suppose that after 2 releases we need x + 1 bytes per tuple but we only foresaw x bytes; so we need to deprecate support for this version and advise DBA to run pg_upgrade two times. I prefer a solution where we know beforehand the size per tuple so when we're rewriting we could use this information to upgrade.
-- Euler Taveira de Oliveira http://www.timbira.com/ -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
