Printing the transaction dump data sets

With two data sets, you can print transaction dumps from one data set while CICS is running.

About this task

You can either print transaction dumps explicitly or use automatic switching.

To print transaction dumps explicitly:
1. Use the command CEMT SET DUMP SWITCH to switch the data sets.
  CICS closes the current data set after any transaction dump being recorded has been completed, and opens the other data set.
2. Print the completed data set using the DFHDU720 dump utility program.
  For information about the DFHDU720 dump utility program, see Dump utilities (DFHDUnnn and DFHPDnnn).
To print transaction dumps using automatic switching:
1. Use the command CEMT SET DUMP AUTO to cause automatic switching when the current data set becomes full.
  This command permits one switch only.
  When a transaction dump data set is full, CICS closes the data set and issues console messages as follows:
```
DFHDU0303I applid Transaction Dump Data set data set closed.
DFHDU0304I applid Transaction Dump Data set data set opened.
DFHDU0305I applid Transaction Dump Data set switched to ddname.
```
2. If you specified DISP=SHR for the dump data set, you can print the completed data set with the DFHDU720 utility program and then reissue the CEMT SET DUMP AUTO command.
  This again switches data sets automatically (once only) when the current data set is full.