TTL is a feature that helps in automatically deleting data from DynamoDB tables after a certain period. Think of it like a self-cleaning mechanism for data that has a short lifespan or becomes irrelevant over time, like session data or temporary files.

Here’s how it works:

  • You assign an expiration timestamp to each item in your table. When the current time surpasses this timestamp, DynamoDB quietly sweeps it away.
  • The process is automatic, so you don’t need to keep an eye on it or allocate extra resources.

Why should you use TTL?

  • Save money by reducing storage space and costs.
  • Speed up your database operations due to fewer data items.
  • Simplify data handling – no manual cleanup needed.
  • Keep in line with data retention policies.

A couple of pointers:

  • Data isn’t deleted the second it expires, and might still show up in queries until it’s removed. Plan accordingly.
  • Even expired items can be updated. If the expiration attribute is altered or removed, the item stays.

That’s TTL in a nutshell! 🚀