David Fetter <david(at)fetter(dot)org> writes:
> Is there a useful distinction to be drawn between the files readable
> by the system user who owns the database and those the database itself
> can read?
Probably not. It's possible to create such a distinction with SELinux
or other security tools, but not in plain Unix, and I don't think we
want to wade into non-standard stuff.
regards, tom lane