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Many legacy applications are based on it. So a basic understanding of them is helpful.
Hierarchical Model
In this model, database is organized as a collection of inverted trees of records (that's why the term ‘hierarchy’). Here the records have parent-child relationship. The top record has zero or more child records. The child record acts as the parent for its descendents. Thus the parent-child relationship continues down the tree.
IBM's IMS is a prime example of a DBMS based on Hierarchical model.
Advantages:
· Fast when queries are simple and sequential search is enough to find records
· Robust
· Highly reliable as it has been in use for a few decades
Disadvantages:
· Weak query language
· Requires significant amount of coding
· As most real-life data are not hierarchical by nature, it is very hard to sufficiently model them using parent-child relationship...
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