AWS Certified Solutions Architect – Associate (SAA-C02) — Question 245

A company has an ecommerce application that stores data in an on-premises SQL database. The company has decided to migrate this database to AWS.
However, as part of the migration, the company wants to find a way to attain sub-millisecond responses to common read requests.
A solutions architect knows that the increase in speed is paramount and that a small percentage of stale data returned in the database reads is acceptable.
What should the solutions architect recommend?

Answer options

• A. Build Amazon RDS read replicas.
• B. Build the database as a larger instance type.
• C. Build a database cache using Amazon ElastiCache.
• D. Build a database cache using Amazon Elasticsearch Service (Amazon ES).

Correct answer: C

Explanation

The correct answer is C because Amazon ElastiCache provides an in-memory caching solution that allows for sub-millisecond response times, which is ideal for read-heavy workloads. Option A, while useful for scaling read throughput, does not guarantee the speed required. Option B may enhance performance, but it won't achieve the sub-millisecond target. Option D involves a different use case focused on search rather than caching, making it less suitable for the requirements.