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From ChadDavis <chadmichaelda...@gmail.com>
Subject Re: A generic question about JackRabbit
Date Fri, 26 Mar 2010 18:23:42 GMT
On Fri, Mar 26, 2010 at 12:21 PM, Alexander Klimetschek
<aklimets@day.com> wrote:
> On Fri, Mar 26, 2010 at 15:34, Rami Ojares <rami.ojares@gmail.com> wrote:
>> Early in the seventies Ted Codd published relational model as an improvement
>> over the hierarchical model that had been used for data storage until then.
>>
>> So why do we still need a hierarchical model for data storage?
>
> In addition to what others have said already: a major requirement for
> going from files to RDBMS in the 70s was the big cost of storage back
> then. Hence normalization was considered important, and the relational
> model made the best use of the disk space available.
>
> But nowadays this is different, so "denormalization" is ok. It makes
> reads faster. And it is absolutely needed for large databases that
> span multiple servers.

Perhaps, OT, but wouldn't we still say that if data integrity is very
important, then we still would prefer a well normalized RDBMS to a
object oriented persistence mechanism?

>
> Regards,
> Alex
>
> --
> Alexander Klimetschek
> alexander.klimetschek@day.com
>

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