====== LU03a - DBS, DBMS, DB ======

==== Introduction ==== 
Databases are fundamental to modern information systems, such as Webshops or Banking Applications. This document provides a concise overview of three key terms:  
  - **DBS**: Database System  
  - **DBMS**: Database Management System 
  - **DB**: Database

The following diagram illustrates the interaction of these three terms:

{{:modul:m290:learningunits:lu02:theorie:de-dbms-with-dd.svg.png?300|}} 


==== Database System (DBS) ====
A Database System (DBS) encompasses the database, the DBMS, and associated hardware and software components. It represents the complete environment for managing data.

**Components of a DBS**
  * Database (DB): The stored data itself.
  * Database Management System (DBMS): The software for managing the DB.


==== Database (DB) ====
A database (DB) is a structured collection of data organized for efficient retrieval and management. It stores information in a systematic way, allowing users to access, modify, and analyze data as needed. Basically, it is several Excel spreadsheets that are linked together.

**Characteristics of a DB **
  * Organized: Data is arranged in a logical manner (tables, records, fields).
  * Integrated: Data is related and consistent across the database.
  * Shared: Multiple users can access and update data simultaneously.
  * Controlled: Access to data is managed through security measures.


==== Database Management System (DBMS) ====
A Database Management System (DBMS) is software that interacts with users and applications to create, store, modify, and retrieve data from a database. It acts as an intermediary between the user and the database.

**Functions of a DBMS**
  * Data Definition: Creates and modifies the database structure.
  * Data Manipulation: Allows users to insert, update, delete, and retrieve data.
  * Data Query: Enables users to search and retrieve specific data.
  * Data Integrity: Ensures data accuracy and consistency.
  * Data Security: Protects data from unauthorized access.
  * ...


===== Vocabulary =====
^ English ^ German ^
| to provide | bereitstellen |
| retrieve | abrufen |
| concise | knapp und präzise |
| to interact | zusammenwirken |
| to modify | verändern |
| intermediary | VermittlerIn | 

===== References =====
Definition DBS: https://de.wikipedia.org/wiki/Datenbank 

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{{tag>M290-LU02}}
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