Mainframe, MVS and zOS Discussion

Hi,

Is there a possibility to delete the ps file records thru JCL and make the ps file a fresh for code availability??

I'm not sure how to do it? Had it been a VSAM dataset I could have used DELETE statement but can we use that with a sequential files also?

For a sequential data set, one approach would be to use IEBGENER with DD DUMMY input and output being the data set with DISP=OLD specified.

Hi Robert,

Thanks. Will DISP=SHR made a difference?

DISP=SHR may make a difference. DISP=OLD requires your job to have exclusive access to the data set. DISP=SHR says that you will share access. With other jobs / TSO users accessing the data set while you're trying to delete all records, you're not likely to delete the records. If no other jobs / TSO users are accessing the data set while your job is running, then DISP=SHR will work like DISP=OLD.

What can be the practical use of this knowledge in the actual Job? Can there be a situation where we need to implement a solution like this?

This situation does occur in production environments. It is not that common but it does happen.

This post might also be of interest: https://zmainframes.com/zlog/delete-con ... mainframe/

Thaks Robert and Anuj.