Question

How does NoDB handle the generation of statistics when using adaptive loading?

a.

Statistics are generated for all attributes during system initialization.

b.

Statistics are precomputed and stored in a separate file.

c.

Statistics are calculated on-the-fly the first time an attribute is requested by a query.

d.

No statistics are generated, and queries rely on heuristics for optimization.

Posted under Big Data Computing

Answer: (c).Statistics are calculated on-the-fly the first time an attribute is requested by a query. Explanation:In NoDB, statistics are calculated on-the-fly the very first time an attribute of a given raw file is requested by a query. This approach allows the system to avoid bad optimization choices.

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