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Question

When might aggregate fact tables be most helpful in improving query performance in a data warehouse?

a.

For queries involving a large number of dimensions

b.

For queries involving a small number of dimensions

c.

For queries that require complex arithmetic calculations

d.

For queries with low cardinality attributes

Answer: (a).For queries involving a large number of dimensions Explanation:Aggregate fact tables are most helpful for improving query performance for queries involving a large number of dimensions.

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Q. When might aggregate fact tables be most helpful in improving query performance in a data warehouse?

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