BISQL – Laymen to SQL Developer # 10 – DBMS [Database Management System] #1 – Introduction, Database Environment, Working of a Simple Centralized Database System
Hi Folks,
This post is part of Series Database Management Systems
Currently running topic for this series is listed as below :
Series of Database Management Systems
>>Chapter 1 : DBMS [Database Management Systems]<You are Here>
Continuing from my previous post on this series, If you have missed any link please visit link below
We are going to Cover the Following Points in this article
- Introduction
- Database Environment
- Working of a Simple Centralized Database System
Introduction
Database Environment
Let us take an example of name, roll number, class, section, attendance and marks of the students of any class. One can have the note of these data in a sequential address book or it can be stored on a hard disk, using a laptop and software like Microsoft Excel. Here name, roll number, class, section, attendance and marks of the students are considered as data and the set of this related data having a specific implicit meaning is called a database.
Database Environment
Various Procedures Carried on in a DBMS
1. The process of specifying the data types, structures and constraints is called Defining the database
2. The process of storing the data on some storage medium
3. Manipulating the Database-involves the retrieval (activity of finding) of required data and modifying it depending on the requirement.
E.g. EMPLOYEE database –
i) Defining of a database
ii) Constructing the Database
iii) Manipulating the Database
E.g. for some queries
1. List all employees whose salaries are greater than 20000
2. List all employees whose names start with “P”
3. Delete records whose Emp_name is Prasad
Working of a Simple Centralized Database System
Simple Centralized Database System
Database is stored in a central location.
Users have access to the common database.
Users can access the data from the central location from their own machines using suitable programs. These required programs are installed on individual computer terminals of the users, as shown in the figure above.
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