Diagnosis
You can follow the process flow of various operations in your SAPsystem using trace functions. These enable you to monitor the systemand to restrict problems that occur.

System Response
You should only use the trace output information in exceptional cases,as it is extremely performance-critical.

Procedure
You can find detailed information about the trace functions in helpunder:
SAP Library -> Basis Components->Client/Server Technology(BC-CST)-> BC System Services -> Tools for Monitoring the System->Using Trace Facilities .Link to this information