Re: WIP: generalized index constraints

On Sun, 2009-07-05 at 17:28 -0700, Jeff Davis wrote:
> This is a follow up to my old proposal here:
>
> http://archives.postgresql.org/pgsql-hackers/2008-06/msg00404.php
>

> Any input is appreciated (design problems, implementation, language
> ideas, or anything else). I'd like to get it into shape for the July
> 15 commitfest if no major problems are found.

I was concerned that your definition of concurrently inserted didn't
seem to match the size of the shared memory array required.

How will you cope with a large COPY? Surely there can be more than one
concurrent insert from any backend?

It would be useful to see a real example of what this can be used for.

I think it will be useful to separate the concepts of a constraint from
the concept of an index. It seems possible to have a UNIQUE constraint
that doesn't help at all in locating rows, just in proving that the rows
are unique.

--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support