[rules-users] Drrols 5 Expert --> Sequential vs Inference

[Greg Barton]

Answering this question in any meaningful way without more information is difficult.  My first instinct is to wonder if the database calls really need to be done directly from the LHS of the rules, especially with this many of them.  I hope you're able to cache the database queries.  

Anyway, in general, if you have that many rules it is usually best to keep them in a fashion that's easily manageable, and that's what RBMSs are for.  Apart from that it's hard to address your question without more information.  Are all of the 3500*0.9 rules evaluated for each input?  Can the data from the database be prefetched into working memory instead of fetched in each LHS?  How often does this fetched data change? There are many paths you could follow mattering on the answers to these questions and others.

--- On Fri, 8/14/09, Vijay K Pandey <VPandey at mdes.ms.gov> wrote:

> From: Vijay K Pandey <VPandey at mdes.ms.gov>
> Subject: [rules-users] Drrols 5 Expert --> Sequential vs Inference
> To: "rules-users at lists.jboss.org" <rules-users at lists.jboss.org>
> Date: Friday, August 14, 2009, 10:52 PM
> 
> Hi, 
> 
> We have around 3500
> business rules and
> rules are mainly look up value based or based on the
> associated data in the
> RDBMS. 
> 
> There are around 90%
> processes where we
> only need sequential rules check, the other 10% of
> processes requires the
> inference capability. 
> 
> My
> questions: 
> 
> a)   
> Which is the best
> way to go for this
> – should we set up all the rules as inference through
> stateful session or
> segregate 90% as sequential and others as inference. Will
> this segregation
> going to give better performance in Drools 5 and
> later? 
> 
> b)   
> Lots of our LHS
> depends on the data from
> RDBMS – we insert 1 fact – then make use of
> “from/collect” to get hold of various
> associated data ---then do
> some checks on the data fetched from RDBMS -- so is it
> better to program them
> in java directly or as sequential rules? 
> 
> Any guidance will be
> helpful? 
> 
> Thanks
> 
> 
> Vijay
>