RDB (Redis Backup File) is a point-in-time snapshot of your dataset stored on disk in a compact binary format. You can configure Redis to take snapshots at specific intervals or when a specified number of write operations have been performed.
AOF (Append Only File), on the other hand, logs every write operation to a file, making it slower than RDB but also more durable. Redis can be configured to rewrite the AOF file at specific intervals, which consolidates and removes unnecessary log entries, reducing the file size.
By default, Redis uses both RDB and AOF persistence mechanisms. However, you can configure it to use only one or none of them based on your requirements. When using both mechanisms, Redis loads data from the RDB file on startup if it exists, followed by replaying the AOF log to bring the dataset up-to-date.
Dragonfly is fully compatible with the Redis ecosystem and requires no code changes to implement.