It has been tested and discuted during a long time. Check the thread if you want to know more about this.
<a href="http:&#x2F;&#x2F;www.postgresql.org&#x2F;message-id&#x2F;flat&#x2F;CAA4eK1KTv73uD9_W5wR4HiMZ_hgi8oseWncxbC53XwZDp-8aEg@mail.gmail.com#CAA4eK1KTv73uD9_W5wR4HiMZ_hgi8oseWncxbC53XwZDp-8aEg@mail.gmail.com" rel="nofollow">http:&#x2F;&#x2F;www.postgresql.org&#x2F;message-id&#x2F;flat&#x2F;CAA4eK1KTv73uD9_W5...</a><p>Keep in mind that&#x27;s the first pieces and not all the patches has merged yet concerning this feature. Still some on progress.