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Question

What is the primary motivation for using query rewriting techniques in the context of OBDA?How do succinct query expressions, such as nonrecursive Datalog programs, compare to unions of conjunctive queries (UCQs) in terms of query rewriting speed?

a.

To separate ontology reasoning from data reasoning.They are slower.

b.

To eliminate the need for query optimization.They are equally fast.

c.

To reduce the size of the ontology.They are orders of magnitude faster.

d.

To replace ontology reasoning with data reasoning.They are about the same speed.

Posted under Big Data Computing

Answer: To separate ontology reasoning from data reasoning.They are orders of magnitude faster. Explanation:The primary motivation for using query rewriting techniques in the context of OBDA is to separate ontology reasoning from data reasoning, which can be costly, especially in the presence of Big Data.Recent results have shown that using succinct query expressions, like nonrecursive Datalog programs, can be orders of magnitude faster than approaches that produce unions of conjunctive queries (UCQs) for query rewriting.

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Q. What is the primary motivation for using query rewriting techniques in the context of OBDA?How do succinct query expressions, such as nonrecursive Datalog programs, compare to...

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