AWS Certified Data Engineer – Associate (DEA-C01) — Question 173

A company needs a solution to manage costs for an existing Amazon DynamoDB table. The company also needs to control the size of the table. The solution must not disrupt any ongoing read or write operations. The company wants to use a solution that automatically deletes data from the table after 1 month.

Which solution will meet these requirements with the LEAST ongoing maintenance?

Answer options

• A. Use the DynamoDB TTL feature to automatically expire data based on timestamps.
• B. Configure a scheduled Amazon EventBridge rule to invoke an AWS Lambda function to check for data that is older than 1 month. Configure the Lambda function to delete old data.
• C. Configure a stream on the DynamoDB table to invoke an AWS Lambda function. Configure the Lambda function to delete data in the table that is older than 1 month.
• D. Use an AWS Lambda function to periodically scan the DynamoDB table for data that is older than 1 month. Configure the Lambda function to delete old data.

Correct answer: A

Explanation

The correct answer is A because the DynamoDB TTL feature is specifically designed to automatically expire items based on timestamps, requiring minimal maintenance. Options B, C, and D involve additional complexities such as configuring Lambda functions and scheduling, which would require more ongoing management than the simple TTL feature.