[Solved] Why might a materialized view become out of date, and how does PostgreSQL handle this internally? — Ans: Because base tables change; PostgreSQL does not auto-update materialized views... | PostgreSQL

PostgreSQL - Views and Materialized Views

Why might a materialized view become out of date, and how does PostgreSQL handle this internally?

ABecause materialized views are read-only; PostgreSQL locks them permanently.

BBecause materialized views are temporary; PostgreSQL deletes them on restart.

CBecause materialized views cache queries; PostgreSQL auto-refreshes them on select.

DBecause base tables change; PostgreSQL does not auto-update materialized views internally.

Step-by-Step Solution

Solution:

Step 1: Understand data staleness in materialized views
Materialized views store snapshots; changes in base tables do not reflect automatically.
Step 2: Know PostgreSQL behavior
PostgreSQL requires manual refresh; it does not auto-update materialized views internally.
Final Answer:
Because base tables change; PostgreSQL does not auto-update materialized views internally. -> Option D
Quick Check:
Materialized views = static until manual refresh [OK]

Quick Trick: Materialized views need manual refresh; no automatic internal update [OK]

Common Mistakes:

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Why might a materialized view become out of date, and how does PostgreSQL handle this internally?