The events that can be traced are organized into five categories
    (Extent/Hash, Init/Common/Sys, Lock, LRU/Mem/MemMgt, and Read/Write),
    which correspond to the organization of the XFC software
    architecture.  Within each type, the traceable events are organized
    by level of importance.  With the /SELECT qualifier, the user can
    select events to trace by type and level-within-type.  With the /MASK
    qualifier, the user can select arbitrary (groups of) events to be
    traced.

    Format

      SET TRACE [/SELECT= | /MASK=] [/RESET]