| From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
|---|---|
| To: | josh(at)postgresql(dot)org, Shashank Joshi <shashyajoshi(at)yahoo(dot)com> |
| Cc: | pgsql-advocacy(at)postgresql(dot)org |
| Subject: | Re: Comparison of PGSQL and DB2 |
| Date: | 2004-03-11 18:59:46 |
| Message-ID: | 200403111959.46586.peter_e@gmx.net |
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| Thread: | |
| Lists: | pgsql-advocacy |
Josh Berkus wrote:
> > Isolation Levels
> > (Support all four ANSI isolation levels (UR, CS, RS, RR).)
>
> I'm not sure about this one; I suspect that we do, however, since
> MVCC, invented for the Postgres Project, has become a standard for
> transaction isolation in the database industry.
Surely MVCC wasn't "invented for the Postgres Project"; otherwise Vadim
wouldn't have done so much copying from Oracle. ;-)
7.5 will support all four isolation levels.
> > Federated Database Support
> > (Ability to allow applications to access & perform JOIN operations
> > on
>
> multiple disparate databases.)
>
> This is a feature which we do not have because it violates the ANSI
> SQL Specification.
That would be news to me.
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