Calling a DLL from ORACLE: problem of time!!!

Hi all! Now I'm going to explain this strange subject. I've made a DLL in Delphi that imports a file from a server. Then I've created an Oracle 9iR2 procedure that makes a call to this DLL. Someone can explain me why the first call to this DLL is slower than the successive calls (20 seconds the first, 5 seconds the other)?
Thank you very much!

Yes! It's exact! After post this message I've casually find this (from Oracle Application Developer's Guide - Fundamentals):
How the Database Server Calls External C Procedures
To call an external C procedure, PL/SQL must find the path of the appropriate DLL.
The PL/SQL engine retrieves the path from the data dictionary, based on the library alias from the procedure declaration’s AS LANGUAGE clause. Next, PL/SQL alerts a Listener process which, in turn, spawns a session-specific
agent. By default, this agent is named extproc, although you can specify other names in the listener.ora file. The Listener hands over the connection to the agent, and PL/SQL passes to the agent the name of the DLL, the name of the external procedure, and any parameters.
Then, the agent loads the DLL and runs the external procedure. Also, the agent handles service calls (such as raising an exception) and callbacks to the Oracle
server. Finally, the agent passes to PL/SQL any values returned by the external procedure.
After the external procedure completes, the agent remains active throughout your
Oracle session; when you log off, the agent is killed. Consequently, you incur the
cost of launching the agent only once, no matter how many calls you make. Still, you should call an external procedure only when the computational benefits
outweigh the cost.
Thank you very much!

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Message was edited by:
user568880
Message was edited by:
Kim Zeevaarders

I think that it's going wrong because i did not install the right SOAP client stack.
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