Re: Create Assertion -- Question from a newbie

[Alvaro Herrera <alvherre(at)commandprompt(dot)com>]

Andrew Sullivan wrote:
> On Sun, Aug 27, 2006 at 07:39:49AM -0700, Richard Broersma Jr wrote:
> 
> > Ah, I see.  So the points is that checking the integrity between
> > two complete data sets can become a preformace killer.
> 
> Not necessarily.  More exactly, building a support system that can
> check such integrity in a completely general way, such that it could
> be used for any arbitrary data, is a hard problem that might destroy
> performance.  It's also a pretty exotic feature.  You might want to
> ask on the -hackers list for more detail, though.

Well, it's on the SQL standard, so we should look forward to
implementing (some form of) it some day.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support