I found some good questions/answers regarding IMS here:
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What are the advantages of a hierarchical database?
What is secondary indexing?
what is the maximumm length of account information in job card of a jcl?
What is a Segment type?
15. Secondary indexes can be used with following databases a. HSAM,HISAM,HIDAM b. HIDAM, HISAM c. HDAM, HISAM, HIDAM d. All the above
Explain the maximum number of pcbs allowed in a psb?
What do you know about MFS?
What are the path calls in imsdb?
What is difference between concurrent image copy and online image copy?
How do you write a PSB code ?
Define psb?
Which is the DL/I function used in CICS-IMS program? IBM