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Re: Comparison of PGSQL and DB2

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: (view raw, whole thread or download thread mbox)
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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