/SELECT=LEVEL:level

    Specifies the level of tracing in XFC on a live system. The
    possible values for level are as follows:

    1    (Default) Traces only major, unusual events.
    2    Traces file access, deacess, truncate, read start and
         complete, and write start and complete operations. Results
         are displayed using the SHOW TRACE command. Setting this
         trace level has only a minor performance impact.
    3    Performs more detailed tracing, which can be viewed using the
         SHOW TRACE/RAW command. Has some performance impact.
    4    Performs very detailed tracing with a noticeable performance
         impact.