> H> Restrict database access to be only in specified directory roots.
> H> Don't give ordinary users any filesystem permissions to these
> H> locations.
>
> Unfortunately this does not help, since the firebird user
> will need full access to those folders regardless of ordinary
> user limitations.
>
> I don't know of a way to avoid this, short of using quotas.
> I would be really glad to hear of one, though.

Setup a new filesystem and only allow FB access to that, so even if some
user fills up that filesystem it will not affect the rest of the OS (and
you'll be notified cause presumably a lot of users would be po'd).

That's assuming a *nix server.