Posit: Unlimited "Undo" in fP?

[Jay R. Ashworth]

On Wed, Jul 25, 2007 at 09:04:22PM -0400, Fairlight wrote:
> What happens if you take a table on which you're altering data, and @wef*
> or any other appropriate events, you actually take a "snapshot" of the
> record into a secondary backup table, complete with an added session and
> sequence number?

Ah... [[Multi-version Concurrency Control]].

Yes, PgSQL has had that for a couple major version now.  I think Oracle
might, too.  :-)

Cheers
-- jra
-- 
Jay R. Ashworth                   Baylink                      jra at baylink.com
Designer                     The Things I Think                       RFC 2100
Ashworth & Associates     http://baylink.pitas.com                     '87 e24
St Petersburg FL USA      http://photo.imageinc.us             +1 727 647 1274