Database caching: Improved hit rates courtesy of DynamoDB Streams

Database caching is notoriously challenging due to issues like cache invalidation, which often occurs non-deterministically and without TTLs, leading to bugs from stale data. The blog discusses a method to enhance cache reliability using DynamoDB Streams, which automatically invalidates and pre-fetches updated entries from DynamoDB. By integrating Momento Cache with DynamoDB through a middleware for AWS V3 JavaScript SDK, developers can easily incorporate caching into their applications. This setup allows for automatic cache updates with minimal coding effort, leveraging DynamoDB Streams to proactively refresh stale cache data. The blog highlights the simplicity of this approach with examples and encourages developers to test the setup, demonstrating how it can improve database performance and reduce latency significantly.