Just as a continuation of this, I can set effective_cache_size to 64MB and it will still use the single-column index, but PG flatly refuses to use the multicolumn index without effective_cache_size being an unfeasibly large number (2x the RAM in the machine, in this case).
Geoff -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
