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.