I manage Oracle, MySQL and, Postgresql (and even one SQLite, but "manage" doesn't quite describe the job).<p>Postgresql and MySQL are about the same complexity to manage: it's easy. Even compiling Postgresql is quick and trivial.<p>But Postgresql has a lot of features that make it the best database for an enterprise environment, especially FDW. Oracle has HS, but it is slow and not very reliable.<p>Overall, I'd say Postgresql and MySQL take hours of my time yearly. Oracle takes months of my time each year. SQLite doesn't take any time, but its use is limited.