At 10:13 PM 16/06/2008, you wrote:

>Thank you Helen.
>
>Here some facts:
>
>The application work in the local lan only. Our network is tcp/ip
>based and all components are from cisco. As far as i know the network
>works correctly.
>The application has a front end at the clients with a notif service
>attached. Means, that data are stored at clients and all 30 sec the
>data are written to the server.
>At the server i have run a tool named "MiTeC Interbase Query". There
>is a Performance Monitor in there and i have run it.
>When i start a querry to the Database over the app i see at the
>Performance Monitor a lot of "Writes to database" but not
>many "Reads from database".

This isn't very clear. First you say that you're using the database mostly for writes from the clients and then you say you are seeing writes to database when you run your query tool. You don't get writes from selects. You don't get reads from inserts. Does the Mitec tool create some kind of temporary structures?

>Is there a way to post you a printscreen?

Don't want one, thanks. It wouldn't tell us anything useful.

>At the same test i have checked the CPU consumation. Nearly nothing
>to do for the cpu. Also the ram consumation is only 650MB incl. OS.
>The Databasefile has only 150MB.
>For a Multiprocessor machine is it not better to run classig server?
>Classic Server support SMP while Superserver doesn't.
>The implementator has no idea where the bottleneck is located.
>
>Database: Firebird 2.0.3 Superserver
>DatabaseInterface: I see on the client a firebird client

That is not what is meant by "data access interface". Applications access the database through an API. A data access interface is a component of your application programming environment that provides a language-specific interface between your program and this API. Examples are VCL, IBX, IB Objects, FIBPlus for Delphi, Jaybird for Java, the Firebird .NET Provider, ODBC (amongst many others). Poor performance is almost always the result of faulty techniques in client programs.

>Users: 60
>Clients: 2000 and XP
>
>Don't know whether the databases were created

A legacy database might have a page size that is too small or an on-disk structure (ODS) that is too old to take advantage of performance enhancements in Firebird 2.

You can use the command-line tool gstat to discover these things and a lot about why your databases might be performing badly. You could start by running (from the bin directory on the server)
gstat -h d:\path\to\your\database. Highlight the output by dragging the mouse and press Enter. That will copy the highlighted text to the clipboard. Paste the output to the list.

Helen