[rspeer]

This is it. Redis is one of the few things in the data-persistence space that is honest about what it can't do.

So many other DBs, caches, or whatever will promise that they can solve all my problems, making me quite angry when I spend weeks developing around them and find out that I've just wasted all that time because their marketing people lied to me.

[paulddraper]

I'm curious: other than the obvious (MongoDB) what are the other offenders?

[rspeer]

Graph databases. They can handle your big data! Wait... did you say you had gigabytes of data? Multiple gigabytes? Oh dear, you're going to need to scale up to an enterprise cluster. What sort of madman would keep a whole gigabyte of graph data on one poor little computer?

Riak 1.x. Anyone remember Riak Search? Not the one in 2.x that offloads it to Solr (I don't know if that actually works), but the one before that, the one they deprecated before there was anything to replace it with.

Any database that promises that you can solve your problems with MapReduce. The developers do not actually want you to MapReduce inside their database. It will probably stall your database so hard it makes it unavailable. Their sales people made them put it on the feature checklist.