During a city game-day festival app, citizen sessions and a live scavenger-hunt leaderboard need sub-millisecond reads and writes far hotter than the primary database should absorb. Which service should front those patterns?
Select an answer to reveal the explanation.
Short Explanation
Game-day leaderboards and sticky sessions want memory speed, not a trip to cold storage or a backup vault. Park that hot scratchpad in ElastiCache Redis and leave the durable database for the quieter work.
Full Explanation
Amazon ElastiCache for Redis provides in-memory data structures well suited to session stores and leaderboard-style sorted workloads with ultra-low latency. S3 and Glacier are object storage tiers, and AWS Backup is for recovery—not synchronous hot-path session or score serving.