WAS v8.5 > Troubleshoot > Work with trace

Enable trace on a running server

Use the dmgr console to enable tracing on a running server. We can use trace to assist you in monitoring system performance and diagnosing problems. We can modify the trace service state that determines which components are being actively traced for a running server using the following procedure.

IBM recommends using the HPEL log and trace infrastructure. With HPEL, one views logs using the LogViewer command-line tool in PROFILE/bin.

1. Start the dmgr console.

2. Click Troubleshooting > Logs and Trace in the console navigation tree, then click server > Diagnostic Trace.

3. Select the Runtime tab.

4. Select the Save runtime changes to configuration as well check box to write your changes back to the server configuration.

5. Change the existing trace state by changing the trace specification to the desired state. Refer to the following topics for specific information on how to change your trace specifications:
   • "Diagnostic trace service settings" describes how we can examine the current diagnostic trace settings and to change where the trace is written (memory buffer or file). If the trace is to be recorded in a memory buffer, we can specify the file to which the memory buffer is to be dumped. We can view the file for trace information.
   • "Log and trace settings" describes how we can configure logging and trace settings for the server.
   • "Managing the application server trace service" describes how we can manage the trace service for a server process while the server is stopped and while it is running. We can specify which components to trace, where to send trace output, the characteristics of the trace output device, and which format to generate trace output in. We can select where the trace is written (memory buffer or file).

   On an application server, trace output can be directed either to a file or to an in-memory circular buffer. If trace output is directed to the in-memory circular buffer, it must be dumped to a file before it can be viewed.

   On an application client or stand-alone process, trace output can be directed either to a file or to the process console window.

6. Configure the trace output if a change from the existing one is desired.

7. Click Apply.

Related

Enable trace at server startup
Turning traces on and off in servers processes using scripting
Configure traces using scripting
Tracing operations using wsadmin.sh
Troubleshoot applications with HPEL

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