This week traversed AWS data layer's three pillars — RDS, ElastiCache, Aurora — each solving different problems with different trade-offs. RDS is 1st-gen managed DB outsourcing RDBMS operations to AWS. Aurora is 2nd-gen, redesigning storage/replication layers cloud-native. ElastiCache is in-memory cache layer complementing both.
DVA-C02 data area questions follow set patterns — "given these requirements (availability, latency, cost, scale, consistency), which service/config answers it." Today we reframe this week through scenarios, then comprehensive 12-question exam.
Real production data layer choice follows 5-step thinking