Currently we are using PHP, MySQL, Sphinx, and Memcached to serve up pages so quick. […] […] Our (MY) final decision was to use Terrastore. I'm not sure if it is the fastest, but it is fast. The main reason is how easy it is to scale with growth, how well it protects the data and keeps multiple copies always available, and the fast release cycle which means it is always improving. As a replacement for Sphinx , we have considered many, but have landed on ElasticSearch, which just so happens to have a direct integration with Terrastore. A no-brainer for us to choose ElasticSearch for our search and ranking algorithms.
via NoSQL databases