Query Optimization for RHS by changing pattern match order ---------------------------------------------------------- Key: DROOLS-675 URL: https://issues.jboss.org/browse/DROOLS-675 Project: Drools Issue Type: Enhancement Affects Versions: 6.2.0.CR3 Environment: any Reporter: Paul Houle Assignee: Mark Proctor Original Estimate: 6 minutes Remaining Estimate: 6 minutes I've been using Drools for what I consider "small" semantic databases, right now in the range of 1M-10M facts but that could get bigger. One thing I notice is that performance is dependent on the order that I put patterns in the RHS; if the high selectivity patterns go first I am happy with the results but put them in the wrong order and gee wiz, I won't wait long enough for it to try all the matches that fail. I see Drools as competitive with products such as triple stores, deductive databases and many of them have this feature