Re: Open 7.3 items

Oliver Elphick <olly@lfix.co.uk> writes:
> This should cause no problem, because we have no
> cross-database communication; it should be impossible for "george@dummy"
> to have any connection with database "test".

Not so; you need look no further than the owner column of pg_database
to find a case where people can see usernames that might be local to
other databases.  Group membership lists might well contain users
from multiple databases, too.
        regards, tom lane