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Features of Hierarchical Model

  • This model is based on the tree structure.
  • This model contains a collection of records that are connected by each other by links.
  • Tree structures that are used in these models are called as routed trees.
  • The empty node of a tree is its root node.
  • The hierarchical model is a collection of routed trees and the relationship that exists in the hierarchical model is one to many and one to one.

Advantages

  • It is easy to understand.
  • More efficient than the ER model.

Disadvantages

  • When a parent node is deleted, child node will also be deleted because of data inconsistency occurs.
  • Stroage space is also wasted.
  • Very complex to design.
  • Structural Independence is not present.

 

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