MySQL & MariaDB Operations

Distro support

Two-family skill. MySQL and MariaDB are wire- and config-compatible forks; where they differ is noted inline. The split that matters most is the config drop-in directory and the service/unit name. The body below uses the RHEL-family paths (grounded in RHEL 9 Recipes 37 & 39); Debian/Ubuntu paths are in the matrix and in references/install-and-secure.md.