Dbms database models

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This document discusses different database models including hierarchical, network, entity-relationship, and relational models. The hierarchical model organizes data in a tree-like structure with parent-child relationships. The network model extends the hierarchical model by allowing nodes to have more than one parent. The entity-relationship model divides data into entities and attributes and represents relationships visually. The relational model, introduced by E.F. Codd in 1970, organizes data into two-dimensional tables related through common fields and is the most widely used database model today.

DBMS DATABASE MODELS
Presented by:-
Surender
Sanjeev
Harsh
manish
Presented to:-
Arbind sharma

DATABASE MODELS
 A Database model defines the logical design and
structure of a database and defines how data will
be stored, accessed and updated in a database
management system.

TYPES OF DATABASE MODELS:-
 Hierarchical Model
 Network Model
 Entity-relationship Model
 Relational Model

HIERARCHICAL MODEL
 This database model organizes data into a tree-
like-structure, with a single root, to which all the
other data is linked. The hierarchy starts from
the Root data, and expands like a tree, adding child
nodes to the parent nodes.

 In hierarchical model, data is organized into tree-like structure with one
one-to-many relationship between two different types of data, for
example, one department can have many courses, many professors and
of-course many students.

NETWORK MODEL
 This is an extension of the Hierarchical model. In
this model data is organized more like a graph, and
are allowed to have more than one parent node.

 In this database model data is more related as more relationships
are established in this database model. Also, as the data is more
related, hence accessing the data is also easier and fast. This
database model was used to map many-to-many data relationships.

ENTITY-RELATIONSHIP MODEL
 In this database model, relationships are created by
dividing object of interest into entity and its
characteristics into attributes.

 E-R Models are defined to represent the relationships into pictorial
form to make it easier for different stakeholders to understand.
 This model is good to design a database, which can then be turned
into tables in relational model

RELATIONAL MODEL
 In this model, data is organized in two-
dimensional tables and the relationship is
maintained by storing a common field.
 This model was introduced by E.F Codd in 1970,
and since then it has been the most widely used
database model, infact, we can say the only
database model used around the world.

 The basic structure of data in the relational model is tables. All the
information related to a particular type is stored in rows of that table.
 Hence, tables are also known as relations in relational model.

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CLASSIFICATION ACCORDING TO DATA MODELS Hierarchal Model In a hierarchical data model, data are organized into a tree-like structure. Network Model based on an enlargement of the concept of hierarchical data bases. Relational Model Data are stored in tables Object Oriented model Object oriented data base systems are the most recent development in data base technology. Introduction Definations Advantages and Disadvantages PowerPoint Presentation PowerPoint Presentation for free

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Student POST: Database processing models showcase the logical structure of a database. The most commonly used model is the Relational database model that sorts the data in a table that consist of rows and columns. The column holds the attributes of the entity and rows hold the data of a particular instance of the entities. The major advantage of the Relational model is that it is in the table form and hence easier for users to understand, manage and work with the data. And, with the primary key and foreign key concepts, the data can be uniquely identified, stored in different entities and retrieved effectively with the relationships. The other advantage is that with the relational model, SQL language can be used to work with the data which is simple to understand and most widely used. The disadvantage of relational model could be the financial cost that is higher in comparison as the specific software needs to be in place and the regular maintenance needs to be performed that requires highly skilled manpower. And, the complexity of the database can be further increased when the volume of the data keep in increasing. Also, there is the limitation in the length of fields stored as different data types in relational model (Joseph & Paul, 2009). The other processing model is the Object-oriented model that depicts database as the collection of objects. The advantage of this model is that it is compatible to work with complex data sets with the use of Object IDs and object-oriented programming. It’s disadvantage is that object databases are not commonly used and the complexity can hamper the performance of database. The other type of database model is the Entity-Relationship model which is mostly used for the conceptual design of database. It pictures the entities, several attributes that falls within the domain of that entity and the cardinality of relationship between them. It’s advantage is that the E-R diagram is easily understandable by the users at the first glance and thus can effectively work with the data in no time and can point out the discrepancies in the data. The other advantage is that it can be easily converted to other models if required by the business. The disadvantage of Entity-Relationship is that the industry standard notations for the diagram is not defined and thus can create confusion to the users. This model is only suitable for high-level database design (S.J.D.,2020). 2Nd Student POST : Database models or commonly referred to as schemas help represent the structure of a database and its format which is run by a DBMS. Database model uses vary depending on user specifications. Types of database models 1. Network model This network model uses a structure similar to that of a hierarchical model. The model permits multiple parents, which is a tree-like structure model. This model emphasizes two basic concepts; records and sets. Records hold file hierarchy and sets define the many-to-many relationship .

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The document discusses several database management system (DBMS) models: - Relational, network, hierarchical, object-oriented, and object-relational models are described as the main DBMS models. - Key aspects of each model are covered, including data structure, relationships, querying capabilities, and advantages/disadvantages. - Examples are provided for the relational model in the form of a sample table and for the hierarchical model in terms of its data structure and relationships. - Overall the document provides a high-level overview and comparison of the main DBMS models.

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Dbms database models

1. DBMS DATABASE MODELS Presented by:- Surender Sanjeev Harsh manish Presented to:- Arbind sharma

2. DATABASE MODELS  A Database model defines the logical design and structure of a database and defines how data will be stored, accessed and updated in a database management system.

3. TYPES OF DATABASE MODELS:-  Hierarchical Model  Network Model  Entity-relationship Model  Relational Model

4. HIERARCHICAL MODEL  This database model organizes data into a tree- like-structure, with a single root, to which all the other data is linked. The hierarchy starts from the Root data, and expands like a tree, adding child nodes to the parent nodes.

5.  In hierarchical model, data is organized into tree-like structure with one one-to-many relationship between two different types of data, for example, one department can have many courses, many professors and of-course many students.

6. NETWORK MODEL  This is an extension of the Hierarchical model. In this model data is organized more like a graph, and are allowed to have more than one parent node.

7.  In this database model data is more related as more relationships are established in this database model. Also, as the data is more related, hence accessing the data is also easier and fast. This database model was used to map many-to-many data relationships.

8. ENTITY-RELATIONSHIP MODEL  In this database model, relationships are created by dividing object of interest into entity and its characteristics into attributes.

9.  E-R Models are defined to represent the relationships into pictorial form to make it easier for different stakeholders to understand.  This model is good to design a database, which can then be turned into tables in relational model

10. RELATIONAL MODEL  In this model, data is organized in two- dimensional tables and the relationship is maintained by storing a common field.  This model was introduced by E.F Codd in 1970, and since then it has been the most widely used database model, infact, we can say the only database model used around the world.

11.  The basic structure of data in the relational model is tables. All the information related to a particular type is stored in rows of that table.  Hence, tables are also known as relations in relational model.

12. THANKS

Dbms database models

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Dbms database models