Re: Len Silverston's Universal Data Models sanity

Em Wed, 05 May 2004 14:31:30 +0000, Alfredo Novoa escreveu:

> Physical data independence is for that. The DBMS must ensure that the sum
> of the movements matches with the stocks. If not, you would have
> uncontrolled redundancy. To control this redundancy has the same
> performance cost as to not have logical redundancy at all.

        Agreed, but with SQL physical data independence simply ain't here.

        At least I have never seen a way of doing that decently in, say, ANSI SQL or Oracle SQL.

        I hope our next system will be done in a RDBMS. But my current ones are stuck in Oracle SQL.

>>	No need to translate, Brazilians can understand Spanish quite
>>well... it would be nice to set somethink like a wiki for that.

        OK, just let's not allow monoglots (AKA as anglophones) to hinder the progress of humankind.

>>Problem would become maintaining it, and settling on a preferred format. 
>>I would say Tutorial D would be quite nice for that, D4 good enough

        Yes, at least it is published...

> BTW What do you think about to use Tutorial D or D4 instead of XML for
> data exchange?

        The obvious thing.

        Provided we have, say, universal data models...

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