Q84 — AWS SOA-C02 Ch.1

Question 84 of 100 | ← Chapter 1

An ecommerce company uses an Amazon ElastiCache for Memcached cluster for in-memory caching of popular product queries on the shopping site. When viewing recent Amazon CloudWatch metrics data for the ElastiCache cluster, the SysOps administrator notices a large number of evictions. Which of the following actions will reduce these evictions? (Choose two.)

• A. Add an additional node to the ElastiCache cluster.
• B. Increase the ElastiCache time to live (TTL). ✓
• C. Increase the individual node size inside the ElastiCache cluster. ✓
• D. Put an Elastic Load Balancer in front of the ElastiCache cluster.
• E. Use Amazon Simple Queue Service (Amazon SQS) to decouple the ElastiCache cluster.

Correct Answer: B. Increase the ElastiCache time to live (TTL)., C. Increase the individual node size inside the ElastiCache cluster.

Explanation

Memcached集群出现频繁数据驱逐通常由缓存容量不足引发，需通过扩容解决。ElastiCache驱逐机制在内存满载时触发，增加节点（A）或提升单节点容量（C）均可直接扩展总内存空间，从而容纳更多缓存数据，减少因容量限制导致的强制驱逐。调整TTL（B）虽可能间接减少驱逐，但题目场景更侧重容量瓶颈，故扩容为直接有效方案。其余选项与内存管理无直接关联。