Re: [rules-users] Is there a faster way of doing this in Drools ?

laune wrote > > Merely filtering a subset of data items from a collection according to > user's changing needs and whims is NOT the primary use case of a > production > rule system. This kind of problem has been solved adequately and > efficiently by SQL queries or some similar DB query technique. > > It is true that such filtering rules, if compiled and stored in a > KnowledgeBase, can achieve the same thing, but, since rules are targeted > at > a more sophisticated use cases, this will never be as efficient as a > simple > query system. > > -W > > you bring up an excellent point. What if the data is streaming in nature and is not stored in a database and outside of your control.

Another approach is to cache the data locally (in a database) and then use SQL to filter it. I decided not to use the database approach because of two reasons. 1. The database write operation may be expensive.

2. In the future I may decide apply more complex consequence to my rules than just filtering.

Thanks. -- View this message in context: http://drools.46999.n3.nabble.com/Is-there-a-faster-way-of-doing-this-in-... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users