AWS Certified Developer – Associate (DVA-C02) — Question 115

A company caches session information for a web application in an Amazon DynamoDB table. The company wants an automated way to delete old items from the table.

What is the simplest way to do this?

Answer options

• A. Write a script that deletes old records; schedule the script as a cron job on an Amazon EC2 instance.
• B. Add an attribute with the expiration time; enable the Time To Live feature based on that attribute.
• C. Each day, create a new table to hold session data; delete the previous day's table.
• D. Add an attribute with the expiration time; name the attribute ItemExpiration.

Correct answer: B

Explanation

The correct answer is B because enabling the Time To Live feature automatically deletes items after a specified timestamp, simplifying the process. Option A requires manual intervention and management of a script, which is less efficient. Option C unnecessarily creates new tables daily, leading to resource waste, while option D does not activate the Time To Live feature, making it ineffective for automated deletions.