Thanks a lot for your immediate response! I will check out the book you recommended. But there is still one important question for me: What are the essential differences between Jess (or an rule-based expert system in general) and deductive databases (e.g. Ontobroker)?
Best regards, Thomas Beer > -----Urspr|ngliche Nachricht----- > Von: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Im Auftrag von James C. Owen > Gesendet: Dienstag, 7. Februar 2006 20:33 > An: jess-users@sandia.gov > Betreff: Re: JESS: Jess and deductive databases > > Hmmmm.... With today's 64-bit environments, you can do several > Terabytes in memory; if you have the memory and the architecture. > We did some studies on that back in 2002 and found that 4GB was > terribly limiting to a "really complex" rulebase. 100 tables with > 1,000,000 entries ends up being 100,000,000 entries which > would take, > on the average of 2,000 bytes per object, 200,000,000,000 bytes of > memory. And that's BEFORE you add the complexity of the rule > matching. That's quite a bit and smacks of poor architecture. It's > the old principle of "Just throw everything into a big bucket, stir > it around, and see what rises to the top." No thought. No > planning. Just hoping. > > Now, to the time problem; I think Dr. Friedman-Hill has covered this > many times and it's covered quite well in his book, "Jess in Action" > - available from Amazon. And, no, I'm not pimping for the book. > Just pointing it out. > > Performance tests are available at http://www.kbsc.com/ > benchmarks2000-2005.xls (available sometime tonight or tomorrow) and > (soon - maybe a couple of months) http://www.kbsc.com/ > benchmarks2006-2010.xls. Enjoy... > > SDG > jco > > James C. Owen > Senior Consultant > [EMAIL PROTECTED] > http://www.kbsc.com > "Never give up. Never give up. Never, never, never give up." > From a speech by former Prime Minister, Winston Churchill, during > the most trying times of the British Empire; a great leader too soon > forgotten by his country after keeping it from being swallowed up by > the Nazi Empire during the second world war. > > > > On Feb 7, 2006, at 11:18 AM, Thomas Beer wrote: > > > Hi all Jess users! > > I'm not sure if this mailing list is the right one for my > question, > > if there > > is a more adequate list just give me a hint. > > I have a more common question regarding Jess, rule-based expert > > systems and > > deductive databases. What are the essential differences (besides > > the smooth > > Java integration) between Jess (or an rule-based expert system) and > > deductive databases (e.g. Ontobroker)? > > Is it possible to store a huge amount of facts (related to > > databases, e.g. > > 100 tables with 1000000 table entries each) in the working memory? > > Is there > > a kind of database backend integrated which automatically > updates the > > working memory? Are there some performance tests available? > > Is Jess appropriate for handling "time sensitive" facts and rules > > related to > > them, e.g. "If time is 06:00 then ring alarm". What I'm asking is, > > is it > > possible (or reasonable) using Jess to implement time dependent > > triggers? > > This would require periodically updates (e.g. every milli second) > > of the > > working memory, right?!? > > > > I strongly appreciate your help! > > > > Best regards, > > Thomas Beer > > > > > > > > Thomas Beer > > ECCA - eTourism Competence Center Austria > > Technikerstrasse 21a > > ICT-Technologiepark > > 6020 Innsbruck > > Austria > > > > E-Mail: [EMAIL PROTECTED] > > www.etourism-austria.at > > > > -------------------------------------------------------------------- > > To unsubscribe, send the words 'unsubscribe jess-users > > [EMAIL PROTECTED]' > > in the BODY of a message to [EMAIL PROTECTED], NOT to the list > > (use your own address!) List problems? Notify owner-jess- > > [EMAIL PROTECTED] > > -------------------------------------------------------------------- > > > > -------------------------------------------------------------------- > To unsubscribe, send the words 'unsubscribe jess-users > [EMAIL PROTECTED]' > in the BODY of a message to [EMAIL PROTECTED], NOT to the list > (use your own address!) List problems? Notify > [EMAIL PROTECTED] > -------------------------------------------------------------------- > > -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
