A company has a read-heavy application backed by Amazon DynamoDB. The application is experiencing high latency during peak hours due to the volume of read requests. The solutions architect needs to implement a caching layer to improve read performance to microsecond latency. Which TWO solutions can achieve this? (Select TWO.)

Answer options:

Amazon CloudFront

Amazon DynamoDB Accelerator (DAX)

Amazon RDS Read Replicas

Amazon ElastiCache for Redis

AWS Storage Gateway

How to approach this question

Identify the two in-memory caching services AWS offers: DAX (specific to DynamoDB) and ElastiCache (general purpose).

Full Answer

B,D

To achieve microsecond latency for a database, an in-memory cache is required. Amazon DynamoDB Accelerator (DAX) is a purpose-built cache for DynamoDB that requires minimal application code changes. Amazon ElastiCache (Redis or Memcached) is a general-purpose caching layer that can also be used to cache DynamoDB data.

Common mistakes

Choosing CloudFront, which caches web content, not backend database queries.

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