When utilizing materialized views, what benefit do they offer in terms of query performance and data retrieval?

Question

Options

• AMaterialized views restrict data retrieval for improved security.
• BRegular views simplify complex data structures for better query performance.
• CThey offer real-time updates reflecting instantaneous database changes.
• DMaterialized views provide precomputed snapshots, improving query performance.

• B
  3% (1)
• C
  5% (2)
• D
  92% (35)

Explanation

Materialized views store the result set of a query physically on disk as a precomputed snapshot, so subsequent queries read cached results rather than re-executing expensive joins, aggregations, or calculations - making option D correct. Option A is wrong because materialized views are a performance optimization, not a security mechanism; row-level security or permissions handle access control. Option B confuses materialized views with regular (non-materialized) views, which are just stored query definitions that run on demand and don't improve performance on their own. Option C is the key trap: materialized views are not real-time - they reflect data as of the last refresh, which is precisely the trade-off you accept for the performance gain. Memory tip: Think of "materialized" as "made real/physical" - the query result is materialized into actual stored data, like printing a report once instead of generating it fresh every time someone asks for it.

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