A database is an organized collection of data
(information) that is organized so that it can be easily accessed, managed, and
updated. The basic function of the database is to make data management easy. A
computer database typically consists of an aggregation of data records or
files, which contain information about sales transactions or interactions with
specific customers.
Types of DBMS:-
·
Hierarchical
·
Network
·
Relational
·
Object-oriented
Hierarchical
Database
In
such a database, the data is organized in a tree structure with nodes as
(parent/child), the nodes are connected through links.
Network Database
In
this type of database, data is represented as a record and the relationship between
the data is shown as a link.
Relational Database
This
database is also known as a structural database in which data is stored as
tables in rows and columns.
Object-oriented Database
A
database in a relational database cannot be distributed to multiple servers’.
This led to the creation of an object-oriented database management system. In
this model, the user can define the method of their data access. This is the
future database model.
MAIN CHARACTERISTICS OF DBMS:-
·
Self-Describing nature
·
Program Data Independence
·
Supports Multiple Data View
·
Sharing Multiple Users
Self describing nature
The Database management system has a self-describing
nature because it not only contains the database itself but also the metadata
which defines and describes the data and relationships between tables in the
database. This information is used by the DBMS software or database users when
needed.
Program database independence
In
DBMS, we have Program database independence because the structure of the data
files is stored separately in the system catalog.
Support multiple data view
A
database has many users, each of which requires a different view or
perspective.
Sharing multiple users
DBMS allows multiple users to
access the database at the same time.
FUNCTIONS OF DATABASE MANAGEMENT
SYSTEM
·
Managing Database
·
Updating the Data
·
Data Modeling
·
Processing Query
·
Security of Data
·
Concurrency Control
·
Crash Recovery
ADVANTAGES OF DATABASE MANAGEMENT
SYSTEM
·
Data Redundancy
·
Data Sharing
·
Data Consistency
·
Data Integration
·
Data Security
·
Backup and Recovery
DISADVANTAGES OF DATABASE
MANAGEMENT SYSTEM
·
Cost of Implementation
·
Database Failure
·
Effort of Data Transfer
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