DAA-C01 Question #84: Real Exam Question with Answer & Explanation

Question

In what ways do materialized views enhance performance in data analysis compared to regular views?

Options

• AMaterialized views offer real-time updates, unlike regular views.
• BRegular views simplify complex data structures more effectively.
• CMaterialized views provide precomputed snapshots, reducing query computation.
• DThey restrict data accessibility for improved security.

Explanation

Materialized views physically store the results of a query on disk as a precomputed snapshot, so when you run a subsequent query against them, the heavy computation (joins, aggregations, etc.) has already been done - dramatically reducing execution time for complex analytical workloads. Option A is wrong because materialized views are the opposite of real-time: they reflect data at the time of their last refresh, while regular views always execute the underlying query live. Option B is wrong because both view types can simplify complex SQL equally well - the difference is in storage and execution, not structural abstraction capability. Option D is wrong because materialized views are a performance optimization, not a security mechanism; access control is managed separately through permissions on either view type.

Memory tip: Think of a materialized view as a cached report - like printing a spreadsheet once and handing out copies, rather than regenerating it from scratch every time someone asks. "Materialized" = "made physical/stored."

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