There are two methods to connect: via a unix socket (path + port) or via a tcp socket (host + port). DBD::PgPP defaults to the former. Specifying the host name differentiates forces the use of tcp.

Update: This would be more accurate 

    parameter    hard coded default
    ------------------------------------------------------
    hostname*    local domain socket
    port         5432
    dbname**     current userid
    user         current userid
    password     ''
    debug        undef
    args         ''
    tty          ''
    timeout      60

*  - "hostname" may be abbreviated to "host"
** - "dbname"   may be abbreviated to "db".

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In reply to Re: DBD message diagnostic? by ikegami
in thread DBD message diagnostic? by BrowserUk

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