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

Question

Options

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

• A
  90% (19)
• B
  5% (1)
• D
  5% (1)

Explanation

Materialized views store the physical results of a query on disk as a precomputed snapshot, so when you query them, the database reads cached data rather than re-executing expensive joins, aggregations, or transformations - making option A correct.

Option B is wrong because materialized views are the opposite of real-time - they reflect data as of their last refresh and must be explicitly or periodically refreshed to pick up changes (that describes a regular/live view). Option C is wrong because materialized views exist to optimize performance, not restrict access - security is handled through permissions and row-level security, not view materialization. Option D is wrong on two counts: it references regular views (not materialized), and while regular views do simplify complex queries, they don't precompute results and can actually be slower for heavy aggregations.

Memory tip: Think of "materialized" as "made physical" - the results are materialized (written to storage) ahead of time, like pre-cooking a meal so it's ready to serve instantly instead of cooking from scratch every time someone orders.

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