DFSMSdfp provides a trace service for use with all functions provided by VSAM RLS. When the tracing is activated, a trace table is created in the VSAM RLS address space.

This trace facility is also used by other functions. Specific trace options for other functions are described in their sections.

You can use SYS1.PARMLIB member CTncccxx to specify trace options for the TRACE CT command and to turn off tracing. CTncccxx must exist at IPL for tracing to be available on the system. The default is CTISMS00. For more information on using CTncccxx to specify tracing options, see z/OS MVS Initialization and Tuning Reference.

Trace also enables external writers (WTR) to capture trace buffers. Capturing trace buffers increases diagnostic capability and decreases the possibility of losing trace data.

For complete syntax and usage information for TRACE, see z/OS MVS System Commands.