You may observe mysql and dradmin Linux user accounts on the server and require justification of their presence for security purposes
All supported DX NetOps Performance Management releases
DRADMIN: The dradmin account is the dedicated Linux user used to install and manage the Data Repository (Vertica)․
Path: /opt/vertica (Default)
MYSQL: The mysql OS-level user is created automatically during the installation of the MySQL database component․
The mysql and dradmin accounts are functional requirements for the underlying database technologies (Vertica and MySQL)