: Key-value stores (Redis), wide-column stores (Cassandra), or document DBs (MongoDB) are chosen for rapid writes, simple lookups, and trivial horizontal partitioning (sharding).
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To pass a system design interview at companies like Meta, Google, or Netflix, candidates must go beyond basic memorization. True system design requires an understanding of how distinct infrastructure pieces work together to achieve scalability, reliability, and low latency. 1. API Evolution and Resource Modification : Key-value stores (Redis)