I found some good questions/answers regarding IMS here:
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What are the main control blocks available in ims db?
What is a database record?
I am totally confused on IMS message segments. When I create a message and it contains 5 segments does the entire message have a 32k limit or does each segment have a 32k limit? Is there a setting in the stage1 sys gen that defines if a transaction can receive/send multi-segmented messages?
What is the return code you get after a successful IMS call?
What is PSB,PCB & ACB?
What is check pointing, sync point?
What are the objectives of dbms in ims?
What are Twins?
What is hierarchical database?
Explain the two ways in which dl/i interface can be invoked?
Define psb?
How we can see the Data in IMS Database?