SAA-C03 - Design High-Performing Architectures - Section 3.6

Improve database performance using caching and read scaling with Amazon ElastiCache, read replicas and DynamoDB Accelerator.

Describe Amazon ElastiCache for Redis and Memcached as in-memory caching layers that reduce read latency and offload repeated queries from backend databases. Compare lazy-loading and write-through caching strategies, explain how RDS and Aurora read replicas distribute read traffic across multiple instances, and identify DynamoDB Accelerator as a purpose-built in-memory cache for DynamoDB that delivers microsecond read response times.

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