> -----Original Message----- > From: IBM Mainframe Discussion List On Behalf Of Martin Kline > > We recently had a job using duplicate temporary data set names and got > some really unexpected results. I didn't find this behavior documented > anywhere, thus the post. > > First, to validate the results, I created a simple four-step job. All four steps > use IEBGENER. Step 1 creates a temporary data set named &&T1 with DISP= > (NEW,PASS). Step 2 copies &&T1 using DISP=(OLD,PASS) to SYSOUT. Step 3 > repeats step 1, also with data set name &&T1 and DISP=(NEW,PASS), but > with different data going to the SYSUT2. Step 4 copies &&T1 to SYSOUT. > > All steps ran with return code zero. The result is that steps 2 and 4 copied > the same &&T1 to SYSOUT both times. The second &&T1 data set was > apparently simply discarded. > > The generated data set name for &&T1 was the same for all steps. > > The JCL reference indicates I should have gotten a duplicate data set name > JCL error. But I did not. > > Since &&T1 went to VIO in the first test, I ran it again with the file going to > DASD. Allocations for the two &&T1 files were SMS managed, went to > different disk volumes, and had identical names. Again, the first &&T1 file was > the one copied to SYSOUT both times. > > For validation, I changed steps 3 and 4 to use data set name &&T2. Steps 2 > and 4 provided different SYSOUT data as expected. > > Sure, there are multiple ways to avoid this issue, such as using different temp > names or using DISP=(OLD,DELETE) in steps 2 and 4. That's not the issue. > That's already taken care of. > > The issue is that the behavior is unexpected and contrary to the > documentation. Has anyone run into this before and found the behavior > documented somewhere?
JCL User's Guide: http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/IEA2B540/4.6. 2.1.5 -jc- ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
