How exactly does graph.performInference() work?

So as far as I understand, if a rules index does not exist, calling this function will call a SEM_APIS.CREATE_ENTAILMENT using whatever info it gets from the attachment. I noticed however that when the rulebase specified by the attachment already exists (e.g. it is created manually via SEM_APIS.CREATE_ENTAILMENT in SQLPLUS) the the function will still run. What does it do in the latter case? Does it update the rules index like graph.commitTransaction() or does it do nothing?
-Alexi

Hi,
Answer to 1) is yes.
For your second question, "Is there a way to do something like graph.performInference() via the SEM_APIS? Or do I have to call SEM_APIS.CREATE_ENTILMENT every time I add/delete a triple from the model?"
SEM_APIS.create_entailment is the API you want to call from SQL to run inference. Whether you need to call that API every time you add/delete a triple
is application dependent. You may want to run create_entailment periodically. Note that, Oracle Database release 11.2 has a cool feature called incremental inference maintenance. It can efficiently update the inference closure after a few triples are added. Please see the user manual for details.
Hope it helps,
Zhe Wu

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