IMS db has a 'tree' like database structure, which everything is connected to the root node, similar to a binary search tree. I tried to find a good resource about how data access is happening in IMS db, but it seems IBM doesn't provide a clear understanding of how its systems work. I'm wondering how a specific node in this database is found, considering the databases with this structure are among the largest ones in the industry. In a binary search tree, the data is found by comparing the children of a parent node. Is this the same method of data retrieval in IMS?
Hierarchical database (IMS DB) data retrieval method
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I think you're looking for this RedBook (SG245352), specifically figures 26 and 27, and the accompanying explanation. The publication is almost 20 years old, but IMS itself is almost 50 years old.