AWS Certified Database – Specialty — Question 33

An ecommerce company is using Amazon DynamoDB as the backend for its order-processing application. The steady increase in the number of orders is resulting in increased DynamoDB costs. Order verification and reporting perform many repeated GetItem functions that pull similar datasets, and this read activity is contributing to the increased costs. The company wants to control these costs without significant development efforts.
How should a Database Specialist address these requirements?

Answer options

• A. Use AWS DMS to migrate data from DynamoDB to Amazon DocumentDB
• B. Use Amazon DynamoDB Streams and Amazon Kinesis Data Firehose to push the data into Amazon Redshift
• C. Use an Amazon ElastiCache for Redis in front of DynamoDB to boost read performance
• D. Use DynamoDB Accelerator to offload the reads

Correct answer: D

Explanation

The correct answer is D because DynamoDB Accelerator (DAX) is specifically designed to reduce the cost of read operations by caching frequently accessed data, thus improving performance and lowering expenses. Options A and B involve moving data or processing it differently, which may not directly address the cost issue related to read operations. Option C, while it could improve performance, does not specifically target the cost reduction goal as effectively as DAX does.