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   Re: [xml-dev] modeling, validating and documenting an xml grammar

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"Bullard, Claude L (Len)" <clbullar@ingr.com> writes:

> I seldom see fully-normalized 
> databases because the overhead of getting and 
> opening tables, creating the view, etc. can be 
> prohibitive vs the maintenance of denormalized 
> data.  Otherwise, I would agree.  These aren't 
> legacy databases.  They are practical ones where 
> performance considerations dominate maintenance.

I seldom see databases denormalized because of credible performance
considerations. Most of the time it's because the DBA or the users
can't deal with so much abstraction - different parts of a relation
being in different tables - or can't be bothered to write client code
to reassemble hierarchical structures from the results of a JOIN.



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