Collecting data about a control region or DL/I region loop

Occasionally, there are problems in specific environments or certain problem types, that require special handling. If IMS can accept commands, you can set a trace.

1. If IMS can accept commands, use the following IMS command to set up the internal trace environment:

   /TRA SET ON TABLE nnnn

   where nnnn= is the DISP, SCHD, DLI, LOCK or LATCH parameter. Each parameter must be entered in a separate /TRA command.
2. Set the z/OS® system trace table size to 999K and turn on branch tracing by issuing the following command:

   TRACE ST,999K,BR=ON

3. Obtain two z/OS SVC dumps of the CTL, DL/I, suspicious dependent region, or CCTL, DBRC, and IRLM regions. Taking a second z/OS SVC dump will help differentiate normal IMS processing from the problem. Obtain a z/OS SVC dump with this series of commands:

   DUMP COMM=(dump title)
   R id JOBNAME=(j1,j2,j3,j4,j5,j6),
   SDATA=(CSA,PSA,RGN,SQA,SUM,TRT),END

   In the previous example,

   j1

   is the IMS CTL or DBCTL region job name

   j2

   is the IMS DL/I region job name

   j3

   is the suspicious IMS dependent region job name, if any

   j4

   is the suspicious CCTL (CICS®) region name, if any

   j5

   is the IRLM region job name (if IRLM DB locking is used)

   j6

   is the DBRC region job name

4. Reset the z/OS system trace table to its original settings.