AW: JESS: Jess and deductive databases
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 H 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 100 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]
JESS: Jess and deductive databases
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 100 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 [EMAIL PROTECTED]
Re: JESS: Jess and deductive databases
H 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 100 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]
