Candle-lite DB2 manual Identifying the dataset to which trace data is written

Using the OMEGAMON II for DB2 Background Application Trace Facility

If you do not enter a start time for the background trace, OMEGAMON II informs you by means of a pop-up panel that the trace will start immediately. You can choose to begin the trace or to return to the previous panel to enter a start time.

If the dataset that you designate for the trace data is not preallocated, OMEGAMON II for DB2 displays a warning message. You can dynamically allocate the dataset as explained in “Identifying the dataset to which trace data is written” on page 83.

Identifying the dataset to which trace data is written

You can dynamically create a VSAM linear dataset to contain the output of an application trace. Use either of these options.

■Select option 7 from the pop-up panel displayed from the application trace main menu.

■Select option 4 from the pop-up actions displayed from the panel that lists the background traces.

The Create Application Trace DSN panel contains three fields. All fields are required unless your installation is using SMS for dataset allocation. In this case, you may omit the Volume information.

DSN	Name of the dataset you want to create
Size	Size of the dataset in megabytes
Volume	The identification (VOLSER) of the volume where the data is to be placed

Viewing the list of background traces

The Deferred Application Traces panel lists the traces you have defined to run asynchronously to your online session and their status. To view the information collected by an application trace, follow these steps.

Step Action

1Return to the OMEGAMON II for DB2 main panel and select Tools from the action bar or type T on the command line.

Result: The Tools pull-down menu appears.

2From the Tools pull-down menu, select option 1 for the application trace facility.

Result: This results in OMEGAMON II displaying a pop-up menu having both foreground and background application trace options.

3From the pop-up menu, select option 6 to display a panel that lists the background traces which you have defined to be started.

Result: OMEGAMON II displays the Deferred Application Traces panel.

Using OMEGAMON II 83