Question

What is the final step required in a parallel DBMS after performing a hash join and calculating preliminary aggregate functions?

a.

Data partitioning

b.

Query optimization

c.

Roll-up computation

d.

MapReduce task

Posted under Big Data Computing

Answer: (c).Roll-up computation Explanation:In a parallel DBMS, the final step required after performing a hash join and calculating preliminary aggregate functions is a roll-up computation to produce the final answer.

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Q. What is the final step required in a parallel DBMS after performing a hash join and calculating preliminary aggregate functions?

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