As an alternative to SQL it's pretty awful (it's explicitly not ACID, for one). As an alternative to an in-memory cache or (occasionally) a DB de-normalization

As an alternative to SQL it's pretty awful (it's explicitly not ACID, for one). As an alternative to an in-memory cache or (occasionally) a DB de-normalization, on the other hand, it works amazingly well for me. I see the persistence is basically just a backup that helps your system get back up to speed quickly after a crash or systems' restart. It's not something that should ever be treated as reliable. I wonder how many people who use it under this or similar use cases have an issue with it.