Author: Sunny Singh

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Prior to DBMS, Database Approach, Data Model — Part 2

Necessary Concepts of Database What is a Database? A database is a set of related data used to support the events of a given company. A database can be considered as a data warehouse once defined as well as accessible by several users. Database Properties The database has the subsequent features: It is an illustration of few aspect of the…...

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Prior to DBMS, Database Approach, Data Model — Part 6

Organisation Based on Number of Users A DATABASE MANAGEMENT SYSTEM (DBMS) can be organisation based on the user number it can support. It can be a single-user database system, that assists only one user at a time, or a multi-user database system, that can assists several users simultaneously. Organisation Based on Database Distribution There are four key distribution systems for…...

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Prior to DBMS, Database Approach, Data Model — Part 5

Data Abstraction Layer In an illustrated view, an individual can understand in what way the dissimilar models work together. Consider this from the highest level, the external model. The external model is the view of the end user data. Generally, a database is a business system that meets the needs of numerous services. On the other hand, a service is…...

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Prior to DBMS, Database Approach, Data Model — Part 4

Types of Data Models Record-Based Logical Data Models Logical data models based on records deliver concepts that users can understand, however data are not far from the way is kept on the computer. Three known data models of this kind are relational data models, hierarchical data models, as well as network data models. The relational model signifies data in the…...

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Prior to DBMS, Database Approach, Data Model — Part 3

Control of Data Redundancy Ideally, the database approach stores each piece of data in a place in the database. In certain cases, there is still data redundancy to increase system performance. However, this redundancy is controlled as well as minimized through application programming by introducing the least amount of redundancy as much as possible in the database design. Data sharing…...

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Prior to DBMS, Database Approach, Data Model — Part 1

Prior to Introduction of Database Management Systems (DBMS) The way computers manage data has changed dramatically in the last few decades. Today’s end users take the many advantages of a database system for granted. Not so long ago, computers used a less elegant as well as expensive approach to data management called a file-based system. File-Based System One way to…...

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Concepts of Network Model and Hierarchical Data Structure – Part 4

Properties of a Hierarchical Schema The hierarchical schema of record types as well as Parent Child Relationship (PCR) types should have the subsequent properties: A record type, known as a root of the hierarchical schema, do not take part in any type of Parent Child Relationship (PCR) as a child record type. Each and every single record type excluding the…...

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Concepts of Network Model and Hierarchical Data Structure – Part 3

Currency Indicators The network’s Data Manipulation Language (DML) restores as well as updates by moving or searching database records. Therefore, it is important to keep an eye on the search. Currency indicators allow an individual to keep track of the records that an individual has accessed last as well as find set occurrences in the DATABASE MANAGEMENT SYSTEM (DBMS). They…...

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Concepts of Network Model and Hierarchical Data Structure – Part 2

Representation of M : N Relationships by Sets The set type represents a 1 : N (one : many) relationship among two (2) types of records, which indicates that a record of the member record type can be displayed in a single specified set instance. The DATABASE MANAGEMENT SYSTEM (DBMS) automatically applies this restriction in the network model. To represent…...

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Concepts of Network Model and Hierarchical Data Structure – Part 1

Introduction This article delivers an overview of the network data model as well as the hierarchical data model. The network model as well as the original language were presented in the report of the CONFERENCE/COMMITTEE ON DATA SYSTEMS LANGUAGES (CODASYL) database work group of 1971. That is why it is sometimes called the DBTG model. The revised reports of 1978…...

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