Recently there has been lots of talk about using hybrid databases for a system like: using traditional SQL based database for storing static data and using Key-Value stores (Cassandra, HBase) and document based databases (MongoDB, CouchDB) for storing data domain with high magnitude of frequency of changes.

This approach seems more pragmatic as compared to using a single database implementation. And once again, one should not forget that one solution does not fit every contexts.

Presentation from Pycon:

The presenter is telling that Redis is the only of its kind in NoSQL ecosystem which is not true because MongoDB is also in-memory database but unlike Redis its document based while Redis is more key-value values based.

Apart from that, the talk is worth watching!!!