What do you mean by hierarchical database?
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what is the use of ENTRY in IMS?
I found some good questions/answers regarding IMS here:
Explain the disadvantage of dynamic generation of acb?
Define pcb?
What is mpp mode?
What are the path calls in imsdb?
What is a Root?
What are all the possible inputs to the DB recovery utility?
Define psb?
What is dbd?
Explain the maximum number of fields allowed per segment and what is the maximum number of fields per database?
What is the advantage of creating the acbs well ahead of time?