Personally I have no good experiences with neither dblink nor dbi-link.They perferm only acceptably on very few records.My approach now is to use srf plperl functions. That approach requires youto have a reasonable knowledge of perl, but is in my experience the fastest(or at least slow) one and certainly the most flexible one.
pgsql-novice by date:
Соглашаюсь с условиями обработки персональных данных