Database
CoreAmazon ElastiCache
Explicit caching example for dynamic scalability.
Key points
- ElastiCache reduces repeat application or database work when key design, TTL, invalidation, and failure behavior are defined.
Best-known use cases
- D1.3, D2.1, and D2.2: add or troubleshoot an application-data cache for a measured repeat-access bottleneck.
What candidates often confuse it with
- ElastiCache caches application data near the workload; CloudFront caches HTTP content near viewers.
Key takeaway
Cache correctness and failure behavior are part of the ElastiCache scaling decision.
Related services
- Amazon Aurora
- Amazon Aurora Serverless v2
- Amazon DynamoDB
Relevant exam tasks
- D1.3 — Task 1.3: Implement performance optimization strategies for compute, storage, and database resources.
- 1.3.1 — Optimize compute resources and remediate performance problems by using performance metrics, resource tags, and AWS tools.
- D2.1 — Task 2.1: Implement scalability and elasticity.
- 2.1.1 — Configure and manage scaling mechanisms in compute environments.
- D2.2 — Task 2.2: Implement highly available and resilient environments.
- 2.2.1 — Configure and troubleshoot Elastic Load Balancing (ELB) and Amazon Route 53 health checks.