Tom, Neither database has and per-table autovacuum settings.
However, since this is a production database, I had to try something, and set vacuum_cost_limit up to 1000. The issue with vacuuming one page at a time went away, or at least I have not seen it repeat in the last 16 hours.
-- -- Josh Berkus PostgreSQL Experts Inc. http://www.pgexperts.com -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance