Re: slow request

Hi !
thanks for your answers
My network works correctly, I have no other problems. I can send/receive
huge files quickly using the windows file share protocol.
Using psql tool, I have the same results ... very slow traffic ... :(
I measure these time and speeds using my watch and a free network tool :
ShowTraffic (Ethereal gives me the same results).

I will try using another switch ...

On 10/9/07, Frank Finner <postgresql(at)finner(dot)de> wrote:
>
> On Tue, 09 Oct 2007 10:34:45 -0000 michael(dot)guiard(at)gmail(dot)com thought long,
> then sat down and wrote:
>
> > Hi !
> > I am using postgreSQL v8.1.5 with latest odbc driver v8.02.0500.
> > I have very slow request between my server and my client. They are
> > both on the same switch 100Mb/s. I have no particular network
> > problems.
> > I use the pgadmin tool to do my request.
> >
> > My database is compose of one table. This table has some simple fields
> > (varchar & int, less than 500 bytes) and its primary key is a
> > varchar(32) (CLSID). This table has 140000 records.
> > I know the primary key as a clsid is not the best choice, but it is
> > mine :)
> >
> > The request "select * from mytable" on the server takes
> > approximatively 30 seconds.
> > The same request on the client takes approximatively 400 seconds !
> > What I do not understand is that my network traffic during this
> > request on the client side is very low. It is less than 100KB/s !
> >
> > Why is it so slow ? I suppose that my 140000 records are retrieve one
> > by one... is it true ? if yes, why ?
> >
> > I try to do the same thing with another table with a primary key as
> > 'int4'. The result is the same : 540 secs to retrieve 150000 records
> > at 45 KB/s (average speed) (132 octets/record * 150000 = 19MB / 45 KB/
> > s = 430 seconds)
> >
> > How can I improve these performances ?
> > thanks
> > Mike
> >
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 9: In versions below 8.0, the planner will ignore your desire to
> > choose an index scan if your joining column's datatypes do not
> > match
>
>
> This could be a DNS related problem, if not the request itself, but the
> connect, is slow. How did you measure these times and speeds?
>
> --
> Frank Finner
>
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>
>
>