Rules Assembly cache tracks rules for which Java generation and compilation is complete. Formerly known as the FUA cache. Located in virtual memory; links to loaded Java classes.
Application-Based Assembly cache tracks rules for which Java generation and compilation is complete. Also known as ABA or AppCentric cache.
The Virtual Rules Table (VTable) is a higher performance replacement for Application-Based-Assembly (ABA) and Rules Assembly (RA). VTable significantly reduces the amount of assembly done in the system in response to rule changes.
Normally you don't need to concern yourself with the internal caching architecture. Is there some business reason you need this? We can't give a full implementation description through the Product support community forums. Can you be more specific on what you need to know ?
Note:Instances of most concrete classes other than those derived from the Rule- base class are not cached in the rule cache. So where does the instance of rules cached after rule resolution which are part of concrete classes?