You can select the amount and types of trace data to be collected,
which provides you with the ability to either run your application with minimal
tracing when performance is a priority, or run your application with detailed
tracing when you need to recreate a problem and collect additional diagnostic
information.
The error log stream, the CTRACE data set for WebSphere
Application Server for z/OS, and the master console are primarily intended
for monitoring or recording diagnostic data for system components and critical
applications. Depending on your installation's configuration, directing application
messages and data to these resources might have an adverse affect on system
performance. For example, if you send application data to the CTRACE data
set, trace entries in that data set might wrap more quickly, which means you
might lose some critical diagnostic data because the system writes new entries
over existing ones when wrapping occurs. Use this logging support judiciously.
Note: You can only use WebSphere Application Server for z/OS support
for logging messages and trace data for Java applications, not for Java applets.