On Thu, 2006-12-21 at 09:36 -0500, Matthew O'Connor wrote:
> Richard Huxton wrote:
> > Simon Riggs wrote:
> >> - improve RI check perf by caching small, static tables in each backend
> >> - apply index filter conditions on index scan to avoid heap lookup
> >
> > For fkey checks against a basically static table could you get away with
> > just checking the index and not the table?
>
> I'm not sure that would fly, there is always the possibility it could
> change, I think the ENUMs patch will solve this performance problem.
Not using SQL Standard syntax it won't.
I'd be happier if it worked with DOMAINs and happier still if we can get
it to optimise just bare datatypes. My objective is to tune a database
without needing to reload any of the tables and to ensure that RI is
effective in both directions (from referencing and referenced tables).
Perhaps there's a way to make that happen...
-- Simon Riggs EnterpriseDB http://www.enterprisedb.com
