Comments on: Owlgres: A Scalable OWL Reasoner http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/ Make lots of money through stealth in shadows Sat, 05 Jul 2008 02:23:34 +0000 http://wordpress.org/?v=2.5.1 By: Kendall Clark http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7956 Kendall Clark Tue, 17 Jun 2008 21:51:32 +0000 http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7956 Olivier, I can't speak for the other projects, but Owlgres isn't Postgres-specific or even tied to Postgres. We developed it with Postgres in mind, but we don't any Postgres internals tweaking. Owlgres exists purely at the JDBC level, except for database-specific setup code. So we could easily make Owlgres work for Oracle or DB2, and probably will do so at some point. To get the *most* performance, one might tweak some DB internals (which is one reason we *prefer* Postgres), but so far that's not been necessary. Olivier,

I can’t speak for the other projects, but Owlgres isn’t Postgres-specific or even tied to Postgres. We developed it with Postgres in mind, but we don’t any Postgres internals tweaking. Owlgres exists purely at the JDBC level, except for database-specific setup code.

So we could easily make Owlgres work for Oracle or DB2, and probably will do so at some point.

To get the most performance, one might tweak some DB internals (which is one reason we prefer Postgres), but so far that’s not been necessary.

]]> By: lolive http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7952 lolive Mon, 16 Jun 2008 21:28:49 +0000 http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7952 IBM is working on a DLP (and now DL) engine on top of DB2. there is an attempt from the EPFL to add such support to Oracle. OwlGres is targetted at Postgres. Definitely there is something to investigate, it seems :) From a developper point of view, I have a concern. Is it possible to abstract such a technology from the RDBMS? So we are not tied to a given "vendor". Or does it require fine tuning of the database internals? IBM is working on a DLP (and now DL) engine on top of DB2.
there is an attempt from the EPFL to add such support to Oracle. OwlGres is targetted at Postgres.

Definitely there is something to investigate, it seems :)

From a developper point of view, I have a concern.
Is it possible to abstract such a technology from the RDBMS?
So we are not tied to a given “vendor”.

Or does it require fine tuning of the database internals?

]]> By: Owlgres, DL-Lite and Selectivity Optimizations | Thinking Clearly http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7652 Owlgres, DL-Lite and Selectivity Optimizations | Thinking Clearly Mon, 21 Apr 2008 13:37:00 +0000 http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7652 [...] have been blogging about Owlgres, our scalable OWL reasoner for DL-Lite. Recently, we have been playing with DBpedia, [...] [...] have been blogging about Owlgres, our scalable OWL reasoner for DL-Lite. Recently, we have been playing with DBpedia, [...]

]]> By: Kendall Clark http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7595 Kendall Clark Wed, 26 Mar 2008 20:24:24 +0000 http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7595 John, There will be a first public release soonish; we'll be giving demos at OWLED next week, and I think some Ordnance Survey folks will be there. After that, we'll make a public release. John,

There will be a first public release soonish; we’ll be giving demos at OWLED next week, and I think some Ordnance Survey folks will be there. After that, we’ll make a public release.

]]> By: JohnGoodwin http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7594 JohnGoodwin Wed, 26 Mar 2008 15:50:04 +0000 http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7594 Is there a demo version we can download and experiment with? Is there a demo version we can download and experiment with?

]]> By: Mike Smith http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7588 Mike Smith Mon, 24 Mar 2008 16:39:41 +0000 http://clarkparsia.com/weblog/2008/03/23/owlgres-scalable-db/#comment-7588 Readers should note that LUBM, as generally used, is not expressible in DL-Lite because it uses transitive properties and because qualified existentials are used in the left side of subsumption relations. The results presented here are with a modified version that reduces the expressivity. Readers should note that LUBM, as generally used, is not expressible in DL-Lite because it uses transitive properties and because qualified existentials are used in the left side of subsumption relations. The results presented here are with a modified version that reduces the expressivity.

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