Re: Slow query execution over WAN network

On Thu, Feb 24, 2011 at 9:56 AM, Clemens Eisserer <linuxhippy(at)gmail(dot)com> wrote:
> Hi,
>
> I experience really slow query execution over remote networks,
> especially for a query which returns a lot of columns (~255) caused by
> joins.
>
> Executing the same query over different networks gives the following times:
> Local:      20ms
> DSL:      400ms
> UMTS: 1500ms
>
> The query returns 12 rows, and 255 column - most of them with only
> very little data. A wireshark-snapshot of a request is only ~30kb
> large, so I guess there isn't a lot of data transported.
>
> I've uploaded a netbeans-profiler screenshot as well as a wireshark profile to:
> http://93.190.88.182/jdbc_traffic.wireshark
> http://93.190.88.182/jdbc_profile.png
>
> Any idea whats causing the high latency? Are there multiple
> round-trips going on here?
> I already tried adjusting fetch size, however didn't change anything.
>
> Thank you in advance, Clemens
>
> PS:  I've asked the question already on pgsql-performance,
> unfourtunatly there wasn't a lot of feedback. Sorry for cross-posting.

The problem is the data coming back I'm sure the WAN is slower than your DSL.

Dave