Re: change the value of "unix_socket_directories" , must used "-h /xx/xx" to use the Unix domain socket

John R Pierce <pierce@hogranch.com> writes:
> On 8/16/2014 9:16 AM, Steve Atkins wrote:
>> Setting environment variables to point to your preferred instance will also work - and it'll work with any client
thatuses libpq (which is probably almost everything that's not java). 

> java/jdbc doesn't support unix domain sockets anyways, so that's moot
> for the OP's issue.

Another idea (which is also only for libpq-based apps) is to set up
a "service" file.

http://www.postgresql.org/docs/9.3/static/libpq-pgservice.html

            regards, tom lane