Re: V3 protocol, batch statements and binary transfer

Andrea,

In general, yes, try to follow our style. Barry Lind wrote the initial
V3 Protocol, so bounce some ideas off the list.

submit your patch as a context diff, to the list. Also make sure you are
using the code from the gborg project.
http://gborg.postgresql.org/project/pgjdbc/projdisplay.php

Also test cases are nice ;)

Dave
On Tue, 2004-03-30 at 08:18, Andrea Aime wrote:
> Well, I have to do it in my spare time along with my regular Geotools2
> involvement, so it will require time. Is anyone willing to give directions
> or I just try to replicate the "look & feel" of the current code?
>
> Best regards
> Andrea Aime
>
> Dave Cramer wrote:
>
> > Andrea,
> >
> > Feel free to chip in, if you can help with the V3 implementation your
> > patches would be greatly appreciated.
> >
> > Dave
> > On Tue, 2004-03-30 at 03:44, Andrea Aime wrote:
> >
> >>Hi jdbc driver hackers,
> >>my name's Andrea and I'm hitting some serious performance problem with the driver.
> >>At present I'm working with the Postgis GIS extension and I'm hitting very low
> >>performance during mass data insertion due to the driver limitations. Basically,
> >>I want to turn a 20 MB shapefile into a postgres table, but it has to be an import
> >>function on the client side (windows pc) so I can't just go to the command line and
> >>issue a copy. But that's just an example, in general I need to perform mass insert
> >>or updates in a transactional environment from a client, usually a Windows PC.
> >>
> >>As far as I can tell the low performance level is due to:
> >>a) lack of true support of batch statements as introduced by the V3 protocol, that
> >> makes the network latency bite me very badly while I'm inserting that 100000 rows
> >>b) use of the text mode instead of the binary one, more than doubling the size of data
> >> that are really transfered over the wire
> >>
> >>That makes the insertion of the above file take more than 2 minutes on a 100MB ethernet
> >>(oh, I have to pass thru 3 switches, so the latency is not that good). A
> >>reasonable transfer time for that amount of data should be less than 30 seconds IMHO.
> >>
> >>I'm wondering, why do you use the text mode instead of the more efficient binary one?
> >>Secondly, reading the e-mails on the archive it appears that you are short of time
> >>for implementing the V3 protocol. Can I help somehow?
> >>
> >>Best regards
> >>Andrea Aime
> >>
> >>
> >>---------------------------(end of broadcast)---------------------------
> >>TIP 6: Have you searched our list archives?
> >>
> >> http://archives.postgresql.org
> >>
>
>
--
Dave Cramer
519 939 0336
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