Question

A developer is building a web application that stores user session tokens in a DynamoDB table. Each session should automatically be removed 24 hours after creation to reduce storage costs and keep the table clean. The developer wants a solution that requires minimal ongoing operational effort and no scheduled cleanup jobs. Which approach should the developer implement?

Accepted Answer

Add an attribute containing the expiration time as a Unix epoch timestamp and enable Time to Live (TTL) on that attribute.

Answer

Create an Amazon EventBridge scheduled rule that triggers a Lambda function hourly to scan the table and delete expired items.

Answer

Store the creation timestamp and configure a DynamoDB Stream to delete each item 24 hours after it is written.

Answer

Enable a 24-hour object lifecycle policy on the DynamoDB table to expire items automatically.