By and large, if you need a database, you can reach for one of the big names—MySQL/MariaDB, PostgreSQL, SQLite, MongoDB—and get to work. But sometimes the one-size-fits-all approach doesn’t fit all. Every now and then your use case falls down between barstools, and you need to reach for something more specialized. Here are nine offbeat databases that run the gamut from in-memory analytics to key-value stores and time-series systems.
Good - fast - cheap... Pick two.
