Enabling and Disabling Process Instance Diagnostic Logging
Log messages from individual process instances are always sent to the Integration Server server.log file. However, these messages are mixed together with Process Engine messages as well as messages from other process instances, so it can be hard to find the specific messages you are looking for.
The Process Engine also supports process instance diagnostic logging for individual process models. When you enable process instance diagnostic logging for a process model, the process instance log messages are sent to both the server.log file and to a separate process instance log file. You can then access the process instance log file to see the messages from an individual process instance.
To enable or disable process model instance diagnostic logging
1. In My webMethods: Navigate > Applications > Administration > Business > Business Processes.
3. In the search results, click 
Edit for the webMethods-executed model version or externally executed process model that you want to enable for analysis. Note:
Enabling this option increases the processing overhead for all instances of this process model, which may have an impact on performance. You are advised to disable this option as soon as you have completed your diagnostic activities.
4. In the Diagnostic Settings window:
Select the
Diagnostic Logging Enabled check box to enable process instance logging.
Clear the
Diagnostic Logging Enabled check box to disable process instance logging.
5. Click Save.
See the following topic for information about viewing the diagnostic file.