A kind of database management system that links
records together like a family tree such that each record type
has only one owner, e.g. an order is owned by only one
customer. Hierarchical structures were widely used in the
first mainframe database management systems. However, due
to their restrictions, they often cannot be used to relate
structures that exist in the real world.
meow
The hierarchical data model organizes data in a tree-like structure with a single parent for each child record. On the other hand, the network data model allows for multiple parent-child relationships, creating a more flexible and complex network of interconnected records. In the hierarchical model, relationships are one-to-many, while in the network model, relationships can be many-to-many.
Reduced content for bandwidth Increased fault tolerance of the network Simplification of management and troubleshooting
The hierarchical model is a restricted type of network model. Again, data is represented as collections of records and relationships are represented by sets. However, the hierarchical model allows a node to have only one parent. A hierarchical model can be represented as a tree graph, with records appearing as nodes (also called segments) and sets as edges.
two main early navigational data models were the hierarchical model and the CODASYL model (network model)
In network model of database , all data is related to each other through a link. By a link we mean that it is an association between precisely two records/data . In hierarchical model records are organized as trees rather than arbitrary graphs.
From a network design standpoint: Core Distribution Access
distribution
What are the disadvanteges of Hierarchical Model?
Power over Ethernet
The relational model is a model in which data is isolated by object and foreign keys to those objects which is organized in tables with multiple columns or attributes. The hierarchical model is a model in which the data is organized in a tree structure that allows repeating information using parent/child relationships.
Relational model of database is a good way to represent the database. Also network data model and hierarchical model can be used depending on the requirements.
core switchesaccess switchesbackbone switchesdistribution switches