A startup company is developing electric vehicles. These vehicles are expected to send real-time data to the AWS Cloud for data analysis. This data will include trip metrics, trip duration, and…

DynamoDB Accelerator (DAX) is an in-memory cache for DynamoDB and does not provide functionality for data lifecycle management or automatic item deletion.

DynamoDB Streams captures item-level modifications but does not automatically delete old data based on a time limit; it's used for triggering other processes based on data changes.

DynamoDB's Time to Live (TTL) feature allows you to define a timestamp attribute on your items, and DynamoDB will automatically delete expired items from the table at no additional cost. This provides an efficient, fully managed solution for data retention policies with minimal operational overhead, perfectly meeting the requirement to store data for 15 days.

Creating and managing an AWS Lambda function to poll and delete old items from DynamoDB would introduce significant operational overhead, including development, scheduling, monitoring, and error handling, compared to the native TTL feature.