Yes, it is, but I think they serve different purposes. I'd use Redis for short-to-medium lifetime data that has high transaction rates. I'd use SQL for medium-t

Yes, it is, but I think they serve different purposes. I'd use Redis for short-to-medium lifetime data that has high transaction rates. I'd use SQL for medium-to-long term data with lower transaction rates. We use both. Redis does what it does well -- make great use of the CPU and the memory on a single box. SQL keeps your data consistent long-term and makes it easy to do ad-hoc queries.