In the Cobol DB2 program, you have not included the SQLCA and Copybook of the Table which contains the host variables. Otherwise, the video was very informative, I am going through the COBOL after15 years again.

I've been programming mainframe computers for 28 years. You don't hear much about these computers because they never go down. It's a digital tank. The engineers who designed these beasts are at another level.

Really nice videos! :-) Another dev tool is the ZOWE plugin for Visual Studio Code.

Very informative and the presentation layouts are well confugured. Also no non sense talking around tooic minutes long. Just great concise informative

Excellent. As you say, it was created to meet the needs of a uniquely demanding customer! And was scalable down as well as up. The data base component was available on the IBM middle sized machines from the 70s, with CICS (Customer Information Control System) to provide the on-line aspect. There was much inter-group banter in IBM between the techies who supported the IMS customers and those who supported CICS customers, and many of the IMS customers had CICS applications as well, usually as packaged programs. I worked mostly on the CICS side, but also taught the operational aspects of IMS - even in the 80s it was incredibly resilient. It is important to realise how tiny even the biggest machines were in those days compared with today's. In theory I could run an MVS system through an emulator on my laptop today (though I don't think it is possible to get the IMS code). And the standard speed of transmission lines was a bit over 100 characters a second, so remote access to data was confined to carefully designed short messages. Your emphasis on the open-endedness of design and the forward planning is absolutely on the ball. The concern about difficulty of learning is a big red herring. I worked in IBM with relational database, both SQL/DS and DB2, and the principles of both data models are similar (just don't tell the data gurus that). Once you have done the hard bit, which is making a clear and concise definition of WHAT you want to store, and HOW you want to access it, the levels of skill to define viable working implementations are roughly the same. As to coding the data access commands, the calls you showed were hardly mystic: GU = Get a Unique record, passing the record identifier, and a space to retrieve the record into. Is that really harder than SELECT xxx, yyy FROM zzz WHERE NAME = "xxxxx"? In both cases you have to check from a control block for the success of the call. Is status GE (Get Empty) harder to remember then SQLCODE 100? And finally, anyone who thinks that COBOL is too hard to learn shouldn't be let near a computer. If they can learn Python with all its idiosyncrasies, they can learn languages like COBOL and FORTRAN. You let slip the word "cool", and that is the major problem. People studying IT today naturally want to "pick up the latest". If you ask them to write a paper on how to guarantee that their code will last for 40 years, what do you think the reaction is likely to be? Sadly, almost all the crucial benefits of IMS (and COBOL!) are exactly the boring bits that people don't want to face up to. And I don't think Universities are meeting their responsibilities in this regard. (End of rant: I am 83, and learnt Python to write SQLITE apps a couple of years ago for a charity. The Python workbench disappeared soon after I went to Windows 11, though the code all still works. At least I won't have to worry about what happens to it in 40 years' time! 😀)

Worth adding the fact that Cloud computing all has to run on something - almost invariably a mainframe, certainly not on air!. I always define "mainframe" as a machine that delivers a guaranteed service to its clients. I started on 8K card machines the size of a sideboard: they did what their users needed on an agreed schedule. My laptop now has 8 Gig, fast network connection, and can process a relational table with 10K rows in a second. Does that make it a "mainframe"? Obviously not. To be complete, the definition of mainframe should always include the idea of guaranteed service delivery to someone. By the way, don't knock Waterfall development. When we were starting from nothing, you HAD to get some functionality complete and fully working to get any return on the cost of development and operation! Both then and now, systems should be developed in a way that allows for extension and flexibility. And congratulations on not getting into childish arguments about the relative merits of different programming languages!

What a fraud. All you did was download NotebookLM audio.

I love your content！！

Amazing

Excellent way to explain with this Q&A session, keep it up!

Super great explain！！！！

wow! Love it. This video is a great introduction to IMS databases. It is informative and well-produced. I would highly recommend it to anyone who wants to learn more about this topic. I would also add that with CA and other tools, it is very easy to interrogate the data via TSO/ISPF.

I can hardly hear the comments. Please let me know if there is another version with proper sound.

No te pases esta cañón como editaron video. Muy mala experiencia escuchsr este video es ridiculo

As always very informative video. Thanks for sharing it.

I gained a lot of knowledge from the video. Thank you immensely for making such informative content!" 😊

Excellent content! 💯

Amazing video. Thanks for the content.

I can't believe IMS is still used!

How can I learn this from the basics! hopefully I will get a reply. Thanks. ✍️

thanks

Really enjoyed this episode, as a Gen Z person I never knew I would touch any part of a mainframe in my career until earlier this year in my Infosec role working RACF.

which wifi extender is this for? what brand /amazon link?

Thank you for this very useful video!, can you please share multiple layouts in copybook

Jcllib

15 sir

Thank you for sharing the knowlegde. - From Brasilia capital of the Brazil.

Thank you for sharing. From Brazil.

As the others have said, thank you, this is very helpful. I have seen this video before, and will again and again.

Clarity not good

Let me know few examples of application program 18:29

Excellent!

Amazing content. Keep up the good work buddy.

Very informative. Good job!

One of good video explaining about IAM in interactive mode. Please bring more such.

The video seems great but the timestamps and chapters are completely wrong

I worked in the mainframe world for 12 years, but have been away for 10. This video is an EXCELLENT refresher as I prepare for a mainframe job interview.

Big Iron! Yeah baby!

Honestly the background music really irritates me

This is an excellent overview, covers pros and cons and ways of modernization. Can you back yourself up for the numbers you've thrown, like 37% orgs consider their modernization as failure or 64% orgs use Mainframne counting to total around 9M lines of Code.

Awesome Than you,

Useless

@-Treatwilliam

Hi We have one requirement from sql server we have to extract the data which method will be effective .xml or json.can you please tell me

I watched your udemy video aswell.. everything this very nice.. Can you remove music from these videos as i watched in 2X speed.. it's quite irritating.

lots of graphics and audio; yet the dialect is off. Sorry this is visually stimulating only. THANKS

Very repetitive

Informative and up to the mark Thankyou

Do you have IMS course from zero to professional? I found not many outside. 0 or more. Thank you!

Thank you for this very useful video!