What feature of DynamoDB allows automatic deletion of items after a specified timestamp?

Time to Live (TTL) is the feature of DynamoDB that enables automatic deletion of items after a specified timestamp. When TTL is implemented, each item in a DynamoDB table can be assigned a TTL attribute that indicates the timestamp after which the item should be considered expired. Once this time is reached, the DynamoDB service will automatically remove the expired items from the table, which helps in managing storage costs and maintaining data relevance by keeping the table free of outdated data.

This feature is particularly useful for applications that generate time-sensitive data, such as session information or temporary user data, where retaining obsolete information does not provide value. TTL is set at the item level and provides a simple and effective way to manage data lifecycle in DynamoDB without requiring complex coding or manual intervention.

By using TTL, developers can ensure that their database remains optimized and relevant, allowing them to focus on building applications instead of managing data cleanup routines.