A company is migrating a large, monolithic database to AWS. The database is highly transactional and requires sub-millisecond latency for read operations. The data model is highly relational and cannot be refactored into NoSQL. Which caching strategy should be implemented to meet the performance requirements?

Answer options:

Migrate the database to Amazon DynamoDB and use DynamoDB Accelerator (DAX).

Implement Amazon ElastiCache for Redis in front of Amazon RDS.

Use Amazon CloudFront to cache the database queries.

Enable Amazon RDS Multi-AZ deployments.

How to approach this question

Match 'relational database' and 'sub-millisecond read latency' to ElastiCache.

Full Answer

B.Implement Amazon ElastiCache for Redis in front of Amazon RDS.✓ Correct

Implement Amazon ElastiCache for Redis in front of Amazon RDS.

Amazon ElastiCache (Redis or Memcached) is an in-memory caching service that sits in front of relational databases like RDS to provide sub-millisecond read latency for frequently accessed data.

Common mistakes

Choosing DAX, which is only for DynamoDB (NoSQL).

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