Most of this is not true for PostgreSQL either. The only two things PostgreSQL needs to run is a daemon (it does not have to be actually daemonized) plus a unix

Most of this is not true for PostgreSQL either. The only two things PostgreSQL needs to run is a daemon (it does not have to be actually daemonized) plus a unix socket, passwords, user accounts, root privileges, etc are all optional. Sure SQLite (which I love) is easier to get running, but do not exaggerate issues of traditional RDBMs. In PostgreSQL 9.3 which will be released in a couple of weeks they will also fix the cases where you may need to use sysctl to iincrease shared memory limits.