Which statement accurately describes the usage of materialized views in data analysis?

Question

Options

• AThey offer a precomputed, persisted snapshot of data, improving query performance.
• BMaterialized views are restricted to storing small subsets of data.
• CMaterialized views are only accessible through stored procedures.
• DMaterialized views update in real-time, reflecting instantaneous changes in the database.

• A
  87% (45)
• B
  2% (1)
• C
  8% (4)
• D
  4% (2)

Explanation

Materialized views store the result of a query as a physical snapshot on disk, so subsequent queries read precomputed data rather than re-executing potentially expensive joins or aggregations - this is exactly what makes them valuable for data analysis and reporting workloads. Option B is wrong because materialized views can store large result sets; their size is limited only by storage, not by design. Option C is wrong because materialized views are queried directly like regular tables - no stored procedure is required. Option D describes a regular (non-materialized) view, not a materialized one; materialized views must be explicitly refreshed (on a schedule or manually) and are therefore intentionally not real-time.

Memory tip: Think of "materialized" as "made physical" - the view is materialized into actual stored data, trading storage space for query speed. If it updated in real-time, it wouldn't need to be stored at all.

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