On Mon, Oct 30, 2006 at 11:46:01AM -0800, ecolgan@shiftwatch.com wrote:
> We're using a remote Postgres server to view video data. It works
> well, but we're having a hard time making our app robust when the
> network fails. For example, PQexec does not return consistently when
> the cable is disconnected.
Network connections use TCP, which was designed to be robust over
unreliable networks. A TCP connection isn't supposed to fail right
away in the face of network problems like disconnected cables;
instead, TCP retransmits packets with the hope that connectivity
will soon be re-established.
> Is there a timeout value that we can configure, so all PQ* functions
> return consistently?
You could use asynchronous command processing with poll() or select().
http://www.postgresql.org/docs/8.1/interactive/libpq-async.html
--
Michael Fuhr