Cody Cutrer <c...@instructure.com> writes: > On Tue, Mar 20, 2012 at 6:06 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: >> There's not really support for adding indexes to system catalogs >> on-the-fly. I think it would work (barring concurrency issues) >> for most catalogs, but pg_class has special limitations due to >> the "relmapping" infrastructure. It's not something I'd particularly >> care to try on a production database.
BTW, I experimented with that a little bit and found that the relmapper is not really the stumbling block, at least not after applying this one-line patch: http://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=f70f095c9096d5e2689e8d79172b37b57a84e51b It seemed to work for me to do this: stop postmaster start a standalone backend with -c allow_system_table_mods=1 create index pg_class_relnamespace_index on pg_class(relnamespace); stop standalone backend, restart postmaster There are a lot of gotchas here, notably that the session in which you create the index won't know it's there (so in this case, a reindex on pg_class would likely be advisable afterwards). I still think you'd be nuts to try it on a production database, but ... regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
