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Li-Fi vs Wi-Fi: A Battle of Light and Waves

Li-Fi vs Wi-Fi: A Battle of Light and Waves Li-fi is a light fidelity device that supports only the infrared and other lighting systems to transfer the data to the device which is used to receive from the sender device. Wifi is a wireless fidelity device that supports the radio waves to transfer the data to the wifi device which is used to receive the wifi signals at the limited ranges due to the device version capacity. Introduction to the computer system and computer applications related topics are listed following below here: Li-Fi vs Wi-Fi: A Battle of Light and Waves Let’s discuss the computer system related topic and questions above listed and their answers are following below here: Li-Fi vs Wi-Fi: A Battle of Light and Waves There are some points on the computer system and data communication related to the topic of “Li-Fi vs Wi-Fi: A Battle of Light and Waves” following below here: Lifi based data communication system:- Li-Fi is a light based signal data transmission ...
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Let us discuss about the three levels of architecture of database management system

What are the three levels of architecture in Database management system?

There are three levels of architecture in DBMS. Database Management system divided into three types of categories. The three levels of architecture are uses to better understanding with their different levels in the DBMS models. These three levels are explained in a short description.

Let us discuss about the three levels of architecture of database management system model

The three levels are categorized of DBMS model following below.

  • External level
  • Conceptual Level
  • Internal level

External Level

  • This is the level is also known as View level.
  • This level interacts with users directly.
  • It is the closest level to the users.
  • Users can understand with this level about the DBMS model.
  • It is also called Graphical interface level.
  • In database, data are observed by the individuals.
  • There are so many views in a view level category. Every viewer can observe only their own database about their information or personal information of the user.

How do you understand by View level in the DBMS?

  • The external level can show of the user database interface from the database management system model.
  • The user or client can understand their data or information from the whole database.
  • Client view their only own information from the database of the system or organization.
  • The viewer can control their own information or database from the system which the user or viewer has taken the permission from the system. Such as change their user identity name and password etc.
  • Viewer have an authority to deactivate your identity from the system as system and their under of terms and conditions.
  • The terms and conditions is also a part of view level or external level of the database for the client, user or viewer. These terms and conditions cannot be changed without the permission of the admin of the database management system of organization or system.

Conceptual level

  • It is also known as logical view level of database.
  • It describes the different types of data are stored in a database.
  • The level of indication is to show their relationships between data.
  • This concerned about what are the information stored in the database in any model of the database.

Internal level

  • It is known as physical level of the database.
  • You can stores the database in the storage devices.
  • It is the level is very closest to the storage devices.
  • You can stores the database in the devices such as Hard disk, SSD, Pen drive etc.

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