Requesting master trace

Start, change, or stop master tracing by entering a TRACE operator command from a console with master authority. For example, to start the master tracing:

TRACE MT

To stop master tracing:

TRACE MT,OFF

You can also use the TRACE command to obtain the current status of the master trace. The system displays the status in message IEE839I. For example, to ask for the status of the trace, enter:

     TRACE STATUS

In the output shown in Figure 1, master tracing is active with a trace table of 140 kilobytes, as indicated by MT=(ON,140K).

Figure 1. Example: TRACE STATUS output

 TRACE STATUS
 IEE839I ST=(ON,0500K,01000K) AS=ON  BR=OFF EX=ON  MT=(ON,140K)
         ISSUE DISPLAY TRACE CMD FOR SYSTEM AND COMPONENT TRACE STATUS

If you want to check the current status of system, master, and component tracing, use the DISPLAY TRACE command. The system displays the status in message IEE843I. For example, to ask for the status of the three traces, enter:

     DISPLAY TRACE

In Figure 2, master tracing is active with a master trace table of 140 kilobytes, as indicated by MT=(ON,140K).

Figure 2. Example: DISPLAY TRACE output

DISPLAY TRACE
IEE843I 15.17.14  TRACE DISPLAY 564
        SYSTEM STATUS INFORMATION
 ST=(ON,0500K,01500K) AS=ON  BR=OFF EX=ON  MT=(ON,140K)
 COMPONENT MODE  COMPONENT MODE  COMPONENT MODE  COMPONENT MODE
 --------------------------------------------------------------
 SYSGRS    ON    SYSSPI    OFF   SYSSMS    OFF   SYSDLF    MIN
 SYSOPS    ON    SYSXCF    ON    SYSLLA    MIN   SYSXES    ON
 SYSAPPC   ON    SYSRSM    ON    SYSAOM    OFF   SYSVLF    MIN
 CTTX      MIN

See z/OS MVS System Commands for details about the TRACE and DISPLAY operator commands. See z/OS MVS System Messages, Vol 7 (IEB-IEE) for information about IEE839I and IEE843I messages.