JESS: scalability issues

[Lucia Masola]

I working with Java and Jess 7.1p2. I've wrote rules that involves searching
relationships between facts in order to obtain all the relatives of a fact.
It involves searching recursively. It all seems to work fine in smaller
examples, but when i tried with a database of approximately 15.000 facts i
couldn't get an answer. Is there any restriction regarding scalability??