I found some good questions/answers regarding IMS here:
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What information does a dbd contain?
which is the first statement in COBOL-IMS programs?
What is the need for a secondary index in ims?
What is difference between concurrent image copy and online image copy?
Explain the maximum number of levels allowed in ims db?
What are the parameters used in CBLTDLI call?
What are the advantages and disadvantages of a hierarchical database?
Which DB access method (OSAM or VSAM) is used for primary index or secondary index and why?
What is a database record?
What do you mean by hierarchical database?
What is psbgen process?
I have a PSB which contains 3 PCB, how to write it ? please..