[abd12]

I think there are some features of DynamoDB that are miles ahead of other databases:

- Billing model. Pay for reads and writes directly rather than trying to guess how your queries turn into CPU & RAM. Also able to scale reads and writes up and down independently, or use pay-per-use pricing to avoid capacity planning.

- Permissions model: Integrates tightly with AWS IAM so works well with AWS compute (EC2, ECS/EKS, Lambda) with IAM roles. Don't need to think about credential management and rotation.

- Queries will perform the same as you scale. It's going to work the exact same in testing and staging as it is in prod. You don't need to rewrite when you get four times as many users.

A lot of folks are worried about migrations, but they're not as bad as you think. I've got a whole chapter on how to handle migrations. Plus, one of the examples imagines that we're re-visiting a previous example a year later and want to add new objects and change some access patterns. I show how it all works, and they're really not that scary.