[gizzlon]

This makes a lot of sense to me. Why bother your main DB with a lot of simple "queries" like these when:

1) They're so easy to move out to something else

2) You main DB probably runs on very expensive hardware, unneccessary expensive for things like this. This probably does not need that expensive san backing it. Not all data is created equal.

3) Redis does this faster

4) Redis is simpler

Of course there are some advantages to storing everything in the same DB, but to me, this seems like a good example of "use the right tool for the job". But, I haven't actually tried this in Redis, so what do I know..