Graph databases. They can handle your big data! Wait... did you say you had <i>gigabytes</i> of data? <i>Multiple</i> gigabytes? Oh dear, you&#x27;re going to need to <i>scale up to an enterprise cluster</i>. What sort of madman would keep a whole gigabyte of graph data on one poor little computer?<p>Riak 1.x. Anyone remember Riak Search? Not the one in 2.x that offloads it to Solr (I don&#x27;t know if that actually works), but the one before that, the one they deprecated before there was anything to replace it with.<p>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.