Re:MongoDB shares jump more than 30% in $192M IPO
by da_chicken on Friday October 20, 2017 @03:08PM
(#15518409)
Wikipedia predates NoSQL. It runs on PHP + MySQL because that's what was most popular back in 2001, and they have no intrest in completely rewriting their entire stack just to use Cassandra or MongoDB. That doesn't mean a NoSQL data store wouldn't work extremely well for the type of application that Wikipedia is.
Wikipedia uses MariaDB (so, MySQL). https://meta.wikimedia.org/wiki/Wikimedia_servers#Software