I just start checking this stuff out
a few days ago. Don't worry, in a few
months you'll flinch when you see my name. :)
The other 1/2 of the questions are still sort
of formless thoughts regarding scalabilty, running
on outdated hardware(486), differing platforms(issues
with the macos threading) and the like.
RobK
-----Original Message-----
From: Falko Braeutigam [mailto:falko@smb-tec.com]
Sent: Friday, August 11, 2000 12:48 PM
To: ozone-users@ozone-db.org
Subject: RE: Object Creation in ozone
On Fri, 11 Aug 2000, Knapp, Robert (CAP, CMC) wrote:
> >%_Thanks! Your explanation answers about 1/2 the questions floating around
> my head. :)
Hmmm... 30 lines and it answers "1/2 the questions"... ?!?! :( :) Not that
good, I think. What are the other 1/2 questions? ;)
Falko
> RobK
>
>
> --------
> Good questions! ;)
>
> IMO it is not possible to swap between different ODMG databases without
> changing to much code no matter if they "fully ODMG compliant" or not. For
> example Objectivity, the only commercial OODBMS that I have a license for,
> claims to support ODMG. In fact, the database classes have to extend a
> special
> base class an all method have to call a fetch() method. Both is explicitely
> ruled out by ODMG.
>
> And, the actual API is just one part of the ODMG spec. Another (very
> important) part is the definition of the underlying object model. This part
> is
> way to unrestricted in the current version 3.0. For example, the ODMG object
> model assumes that objects are activated on the client. (for historical
> reasons, I think) but it's not strickly defined somewhere. ozone is based on
> a
> single instance architecture where objects live inside the server. This
> difference is very important for the application architecture because it
> influences performance and transactional behaviour but ODMG is completely
> unaware of this.
>
> However, even if it does not allow to re-use 100% of the code, programming
> against the ODMG interface makes it easier to port applications (even more
> if
> you keep in mind the above mentioned restrictions of ODMG) and to re-use the
> knowledge of the programmers.
>
> The ozone ODMG interface is there and it works. It tries to be as ODMG
> compliant
> as possible. I don't know how it works for real world applications. So any
> experiences are welcome. ;)
>
>
> Falko
> --
> ______________________________________________________________________
> Falko Braeutigam mailto:falko@smb-tec.com
> SMB GmbH http://www.smb-tec.com
>
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______________________________________________________________________
Falko Braeutigam mailto:falko@smb-tec.com
SMB GmbH http://www.smb-tec.com