It's not mentioned in the post, but PostgreSQL is the prime candidate to replace your MySQL: "The World's Most Advanced Open Source Relational Database". We are happy users of PostgreSQL in Zalando since 2010 (we switched from MySQL).
Here some old slide deck (2013) where I briefly "ranted" about MySQL:
https://www.slideshare.net/try_except_/goto-2013whyzalandotr...