Mainframe, MVS and zOS Discussion

Thanks, Enrico — super helpful.I tried the chunked approach locally and it looks promising. Before I finalize, wanted to validate a few things with the experts here:

For ~1M lines, is EXECIO in chunks (say 10K–50K lines per read) generally the sweet spot? Or do you tune chunk size based on LRECL ...

Makes sense, thanks! So in practice, would you suggest mixing both — say, using EXECIO in chunks (like 10K lines at a time) to balance speed and memory?
Or is LINEIN still the safer route for really large files?

Thanks for sharing that! Was your RPA setup targeting 3270 screens directly, or did you integrate it through an emulator API?

Hi,

What are the best tools for testing in mainframes? Is screen scrapper the only ones which wins or there are more tools which can help in automating testing?

Use case:
Reading ~1M lines and parsing.
Is EXECIO with STEM more memory-efficient than LINEIN?
Any sample loop patterns?

Thanks Anuj. 

zum13Many large businesses have huge investments in mainframe technology as the means of running their businesses. Migrating that functionality to another platform would be incredibly expensive to do so the alternative is to move away from the paradigm of the mainframe as being a thing solely for ...

Thank you so much zum13, this is very helpful. 

zum13

enrico-sorichettithe TS does NOT want to process all the generations
he wants  to pull all the generations names into a file

 

 

 

As in

Code: Select all

LISTCAT LEVEL(basename)

?

I live in Mumbai , India now.

hi all,
i am expecting to pull all gdg versions in a file using the gdg base names, can anyone help me same?

DB2Explain the effects of using CURSOR WITH HOLD with GROUP BY and ORDER BY clauses in your queries.

Hi,

Does any one have idea about rc 1000 in JCL?
 

Happy New Year everyone!

Hi,

Thanks for the reply. I want to test the query in SPUFI and QMF and later use the query in COBOL program.

How to get top 5 rows from table thru SQL?

203

Thanks.

I have seen people using MVS also but not MFT or MVT. But as you said, IBM documents still use MVS, perhaps that makes to use it.

Hi,

My question is perhaps offtopic but this has been haunting me. What is more appropriate to use between OS390 versus zOS? I have seen people are using these terms, usually, interchangibly. Is not it that OS390 is among the initial releases of the operating system? And it's zOS now.

Yes, that's the only option I am also thinking of now.