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Caching Strategies
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An app checks Redis, finds no product, reads PostgreSQL and populates Redis. Who owns the fallback logic in this pattern?
AThe CDN implements origin-driven push invalidation.
BThe application implements cache-aside loading.
CThe cache implements transparent read-through loading.
DThe database implements synchronous write-through loading.
A cache acknowledges writes before asynchronously flushing them to the database. Which additional failure must the design address?
AEvery cache hit requires waiting for a database commit.
BThe database must execute each read twice to preserve ordering.
CRead replicas automatically reject all cached values.
DAcknowledged writes may disappear if unflushed state is lost.
A two-entry LRU cache starts empty. Requests are A, B, A, then C. Which entry is evicted when C is inserted?
AB, because A was accessed more recently.
BNeither, because hits increase the configured capacity.
CA, because it was inserted before B.
DC, because it has the fewest previous accesses.
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