Re: Jasmine an OODBMS ? (Was: Re: troubles experience?)
__mm_(''')_mm__ <akmal@no_spam.com> wrote in article <01bdbee6$8fd68c80$3639ea9e@UKP014505.logica.co.uk>... > Erlend Bjorge <erlend-b@spam_yourself.ifi.uib.no> wrote in article > <35C5BE0F.64DE@spam_yourself.ifi.uib.no>... > > Hi there ! > > > > > >Hang on a minute though. Jasmine has a relational storage > > > >manager AFAIK. How come it is an ODBMS then? > > > > > > > ??? Jasmine is an Object oriented database (aka OODBMS), whats this > > > about having a "relational storage manager"? I haven't seen anything > > > "relational" about it in the last 12 month's I've been playing with > > > it? > > > > Michael Kay, gave me this explanation one time: > > > > http://www.dejanews.com/getdoc.xp?AN=346046896 > > > > It's data model is object-oriented (as we all "know"), but on the bottom > > it act more like a RDBMS. hmmm > > Thanks Erlend. I've just emailed Mike to explain in detail what type of storage > manager is used (i.e. if it is Relational or if CA have re-written it and now > have something totally new). > > > > > Maybe that's why it don't support object clustering because > > it _can't_ ? IMV: One of Jasmines disadvantages, beside it's > > full automatic class extent feature (which can mean less > > performance). > > > > Any comments on this ? > > > > (remember that Jasmine use extent in anohter way than > > ODMG-93 (extent) define it, and "I" use it). > > > > > > On the other side, not many > > OODBMS has CA behind them, > > and they are comming fast ! :-) > > I read somewhere recently (I will try and dig-out the article - give me a day > or two) that Charles Wang (top man at CA) claimed that Object-Relational DBMSs > were "arse-backwards"! (sorry to be rude - his words, not mine). It would be > nice to see how a product that uses a Relational Storage Manager can be classed > as an ODBMS then (but maybe I pre-empt what Mike Kay has to say). "Earth > calling Mike Kay... Where are you Mike?" > > > > > > > Hope this helps ! > > > > Take care, > > Erlend > > > O.K. I've had an email from Mike. These are his opinions. In a nutshell, here's the deal: 1. CA are using an enhanced Ingres storage manager. 2. The Jasmine storage model is tabular. Each class is stored as a table. If anyone wants to contact Mike, he can be reached at: Dr Michael H. Kay <M.H.Kay(at)eng.icl.co.uk> If I recall, there is/used to be a book on Jasmine/ODBII as well (???) : Object-Oriented Database System H. Ishikawa Springer-Verlag, 1993 ISBN 0387701281 Regards, -- akmal ....................................................................... . Dr. Akmal B. Chaudhri, Object Technology Specialist, Logica UK Ltd. . . e-mail: akmal(at)bigfoot(dot)com http://www.bigfoot.com/~akmal/ . . Any opinions expressed are mine and not necessarily those of Logica . .......................................................................