Question

Why is the assumption of centralized query execution not usually applicable in the real world for OBDA?

a.

Because centralized systems are more efficient

b.

Because data are distributed over many autonomous, heterogeneous sources

c.

Because centralized systems can handle TBs of data

d.

Because centralized systems can generate complex queries

Posted under Big Data Computing

Answer: (b).Because data are distributed over many autonomous, heterogeneous sources Explanation:In the real world, data for OBDA are often distributed over many autonomous, heterogeneous sources, making the assumption of centralized query execution impractical.

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