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Database System:
A database refers to a collection of data which is stored and accessed virtually. The data is stored in a structured and proper manner so that the users don’t face any difficulties in searching or modifying it. A database is important because all the data and information needs to be stored somewhere where it can be used for modification or reviewing at a later stage. It is shared with different users at the same time by using a Database Management System (DBMS). DBMS helps users to maintain a good and functional database.
Types of Database
There are various types of database which are listed below:
Commercial Database: A commercial database refers to a collection of data which can be presented electronically such as on TV. The user does not have theright to modify or change it. The only way to access this database isby using a commercial link.
Operational Database: Operational Database is a database which is regularly updated such as online transactions, employee information,and customer information.This type of database is most commonly used in fields such as marketing, production, employee management etc.
Centralized Database: As the name suggests, this database is accessed, stored and modified in a centralized location. The centralized location is often a central database system which can be accessed from a remote location.
End-UserDatabase: End-User database is accessed by the end users of a software application through a query language. This database is generally shared among different users of different end user applications.
Distributed Database: The basic feature offered by this database is that, the data is stored on multiple devices, either at the same location or over different devices spread across different locations and connected through a network. This common database is accessed and linked together with the help of a single communication link.
Personal Database: This database is nothing but the data stored and maintained on personal or working computers. Only the user is able to change or modify it as he is the only person who has access to these files. This data can be shared with limited users via a network.
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Advantages of Using Database
Databases are commonly used by nearly every organization. It helps them to keep a regular update of important data such as Leave management, salary increments etc. This data is independent of the end users application.
Using a database can reduce the duplication of the data which is stored at multiple locations. Therefore using shared database results in minimum data redundancy.
It becomes easier to modify data that is stored only in one location thereby improving data consistency.
Using databases also improves data sharing among different users.
Data is stored for a reason and the reason is that it has to be available when needed. Database enables quick accessibility and responsiveness to retrieve data.
Components of a Database Environment
Computer Aided Software Engineering Tools: Basic Tools are needed to design and develop a database. These are automated tools which are used in this environment.
Repository: A repository is an area where the data has to be stored. This area should be able to hold any data such as Excel spreadsheets, presentations, images, documents, programme files etc.
Database Management System: DBMS helps a user to retrieve and access the database.
Database: It is the collection of data stored. The common difference between repository and database is that the database contains the presence of data whereas; the repository contains the definition of the data.
Application Programs: These programs are the end user applications which are used to provide the information to the users.
User interface: User interface provides a platform through which a user interacts with various system components,used in a database environment.
Types of Structures in Database
Hierarchical Database: The data is represented in the form of a tree structure. It has a single parent node that has relationships with various types of data.
Network Database: In this type of database, the data is represented in a flexible way. It is the other representative of the hierarchical structure. It also uses a tree-like structure but with multiple parent nodes.
Relational Database: This is mostly used by users as in this type of database the data between the file is relational. Thus it is easier to locate and access the data by using a common query.
Object-oriented Database: In this type of database, the objects are represented as the data which are used in object-oriented programming.
Advantages of Database Management Systems
DBMS provides end-to-end user access to the data and at the same time uses it to modify or retrieve it.
The greatest advantage of DBMS is that the data is secured and protected better thanany external source.
Using DBMS, multiple users can access the data in a controlled manner.
Multiple applications can be usedthe same database to store their data and manipulate it.
It also provides an interface, through which, the data access becomes simpler.Hence,the user is required to employ only a simple query to reach out the data.
DBMS provides inbuilt integrity checks which ensures that the data is accurate and has high data integrity.
You can store large amounts of data in a database without any complexity.
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