AWS Certified Big Data – Specialty — Question 57

An organization is designing an application architecture. The application will have over 100 TB of data and will support transactions that arrive at rates from hundreds per second to tens of thousands per second, depending on the day of the week and time of the day. All transaction data, must be durably and reliably stored. Certain read operations must be performed with strong consistency.
Which solution meets these requirements?

Answer options

• A. Use Amazon DynamoDB as the data store and use strongly consistent reads when necessary.
• B. Use an Amazon Relational Database Service (RDS) instance sized to meet the maximum anticipated transaction rate and with the High Availability option enabled.
• C. Deploy a NoSQL data store on top of an Amazon Elastic MapReduce (EMR) cluster, and select the HDFS High Durability option.
• D. Use Amazon Redshift with synchronous replication to Amazon Simple Storage Service (S3) and row-level locking for strong consistency.

Correct answer: A

Explanation

The correct answer is A because Amazon DynamoDB is designed to support high transaction rates and can provide strong consistency for read operations. Option B may not handle the required scale efficiently, while C is not optimized for transactional workloads, and D is more suited for analytical queries rather than transaction processing.