Re: S.O.D.A. database Query API - call for comments

> Vadim Tropashko wrote:
> > >> >CERN needs to store megabytes of data in milliseconds.
> > >>
> > >> True. I bet those are just simple flat records, however. Why bother
 about
> > >> objects then?
> > >
> > >What do you want to bet?
> > >The generated data is all but simple and flat.
> >
> > Do you imply that you have real time applications with objects and it
 ships
> > objects to sensors via Corba? :-) Anyhow if you have a set of sensors,
 they
> > measure just scalar values, right? I understand that you might want to
 nest a
> > flat vector of data into objects, as the vector components map into
 containment
> > hierarchy of the device. Or am I missing anything else?
>
> Sorry, I am not informed about the technical internas but I am absolutely
> positive that object-orientation was essential for this project. You can
> probably investigate a lot over the web:
> www.cern.ch
>
> Sensors (or whatever hardware) would of course deliver flat data.
>
> Wild guesses:
> Data might just be too much to store in real time. Pre-processing could be
> used to create objects from possibly analogous data. I would assume that it
> makes sense to link the output of multiple sensors. Sensor types might have
> inheritance hierarchies. The 3D positioning of the respective sensor would
> probably also be an interesting and variable factor.
>
> Kind regards,
> Carl
> ---
> Carl Rosenberger
> db4o - database for objects - http://www.db4o.com
>
>

This is purely speculation, but here is something from my webpages that might be relavant:

"One interesting theory put forth by Russell Wallace is that OODBMS emphasize a single aspect or single data access path at the expense of others. For example, if you have a hierarchical arrangement, the OODBMS may be faster. However, if you need other views or other relations in addition to the one hierarchy, then RDBMS may be faster. One can say that OODBMS may be more IS-A optimized while RDBMS are more HAS-A optimized. Perhaps RDBMS can be tuned to give priority to specific indexes and relations. However, this may have limited value in business applications, which tend to be HAS-A in structure."

-T- Received on Sat Jul 21 2001 - 20:01:49 CEST