Re: Multiple logical databases

Mark,

> Even though they run on the same machine, run the same version of the
> software, and are used by the same applications, they have NO
> interoperability. For now, lets just accept that they need to be on
> separate physical clusters because some need to be able to started and
> stopped while others need to remain running, there are other reasons,
> but one reason will suffice for the discussion.

Well, to answer your original question, I personally would not see your 
general idea as useful at all.  I admin 9 or 10 PostgreSQL servers 
currently and have never run across a need, or even a desire, to do what 
you are doing.

In fact, if there's any general demand, it's to go the opposite way: 
patches to lock down the system tables and prevent switching databases to 
support ISPs and other shared-hosting situations.

For an immediate solution to what you are encountering, have you looked at 
pgPool?

-- 
--Josh

Josh Berkus
Aglio Database Solutions
San Francisco