Data is needed in each field of life, either in any government office, in any
organisation or in any industry. In the absence of data, it is impossible to process a work
continuously. How much employees are working in an office, what work is given to
employee, from the given work how much he has completed, whether work done by him
is according to expectations or not, what is salary of each employee, whether its
disbursement is possible, disbursement came or not etc, information are stored in form
of data.
Data : Such unarrange grouped information, that can be used in true meaning
after its arrangement and analization, this arranged and analized information should be
easy to understand and use is called data.
Database : Database is collection of data which is related by some aspect, Date is
collection of facts and figures which can be processed to produce information. Name of a
student, age, class and her subjects can be counted as data for recording purposes.
mostly data represents recordable facts. Data aids in producing information which is
based on facts.
A database management system stores data, in such a way which is easier to
retrieve, manipulate and helps to produce information.
Data Base Management System (DBMS) : A group of such programs, that is
ed to store and retrieval of data in database is called Database Management System
(DBMS). It is such software that is used for management, maintenance of data and at
need for retrieving data. It can be defined as, DBMS is the grouped form of many
programmes, which provides a centrally managed system to an organisation with its all
capacities.
DBMS uses two types of languages far its all works Data Definition Language
(DDL) and Data Manipulation Language (DML).
DDL is used to define physical description of record such as size, name, fields
name, data type, etc.
DML is used for processing of database such as retrieval of records for any work, its
processing, arrangement of them in a order, deletion of them etc.
DBMS software facilitated in market are database, ForBase, Forpro etc.
A database Management System mainly completes following works -
1. If any programme is processing and programme needs some data of database,
then it requests for data to DBMS. .
2. DBMS decides that requested data is defined already or not and wherever user
can use this.
3. DBMS requests to Operating System to provide this data from database.
4. DBMS sends processed data from Operating System to Programme.
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