Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!uunet!mcsun!news.funet.fi!tukki.jyu.fi!sakkinen
From: sakkinen@jyu.fi (Markku Sakkinen)
Newsgroups: comp.object,comp.database
Subject: Re: Looking for explanation of OODB problem
Message-ID: <1991Jun14.083745.2186@jyu.fi>
Date: 14 Jun 91 08:37:45 GMT
References: <1991Jun6.194440.2879@apd.mentorg.com> <1991Jun10.070451.18516@chinet.chi.il.us> <1991Jun13.231646.29226@odi.com>
Organization: University of Jyvaskyla, Finland
Lines: 46

[This thread discussed some article of E.F. Codd.]

In article <1991Jun13.231646.29226@odi.com> dlw@odi.com writes:
>In article <1991Jun10.070451.18516@chinet.chi.il.us> dhartung@chinet.chi.il.us (Dan Hartung) writes:
>
>   The paragraph I think is relevant is this:
>
>   "Can the OO approach to database management support distribution independence?
>   In other words, can application programs remain unchanged and correct when
>   a database is converted from centralized to distributed and later when the
>   data must be re-distributed?  What support does the OO approach provide for
>   built-in and user-defined integrity constraints that are not embedded in
>   the application program?"
>
>What a peculiar question.  I cannot imagine why he thinks that an OO
>database should have any more trouble with distribution than a
>relational database.  The best speculation I can come up with is that
>he is under the impression that object identifiers as stored in
>databases encode the physical location of the object, in a way that is
>somehow visible to the program, or something like that.  I don't know
>why he should make such an assumption.

I guess that Codd not only _is_ ignorant about OODB's but that he
_wants to remain_ ignorant, so he can bash them without restraint
when preaching the Only Holy Relational Religion - dogma subject
to alteration by Codd without prior notice.

Things like built-in and user-defined integrity constraints that are not
embedded in application software happen to be one of the strong points
of the OO approach!  What support does the _relational_ model provide
for them?

[rest of original article deleted]

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Markku Sakkinen (sakkinen@jytko.jyu.fi)
       SAKKINEN@FINJYU.bitnet (alternative network address)
Department of Computer Science and Information Systems
University of Jyvaskyla (a's with umlauts)
PL 35
SF-40351 Jyvaskyla (umlauts again)
Finland
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