> I've been thinking about this a bit, too. I've been wondering if it
> might make sense to have a "random_page_cost" and "seq_page_cost"
> setting for each TABLESPACE, to compensate for the fact that different
> media might be faster or slower, and a percent-cached setting for each
> table over top of that.
>
I thought about making it per-table, but realistically I think most
people don`t use tablespaces now. I would not want to be telling
people "to be able to hint the planner to (not) index-scan the table,
You must move it to a separate tablespace".
A global default, a per-tablespace default overriding it, and a
per-table value overriding them both seems like over-engineering to
me.
Greetings
Marcin