I haven't done any database stuff in quite a while, and I was looking at
MySQL.

I found default-mysql-server, which depends on mariadb-server-compat,
which depends on mariadb-server.

Running mysqladmin ping returns:

'mysqld is alive'


Running mysqladmin version returns:

mysqladmin from 11.8.3-MariaDB, client 10.0 for debian-linux-gnu (x86_64)
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Server version        11.8.3-MariaDB-0+deb13u1 from Debian
Protocol version    10
Connection        Localhost via UNIX socket
UNIX socket        /run/mysqld/mysqld.sock
Uptime:            12 hours 1 min 58 sec

So, is mariadb what is actually running, with a compatibility layer to
allow mysql commands?  If so, then I would assume that I can treat the
installation as either mysql, or mariadb.  Is this correct?  Is there
any reason to treat it as one, or the other?

Marc