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Types of databases and database Applications, Advantages of Using the…
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Basic Definitions
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Mini-World :
- represents some aspect of the real world "تمثل بعض جوانب العالم الحقيقى" .
- In order for a database to be accurate at all times , (It must be a true reflection of the Mini-World) , So changes must be reflected "موثقه" in the database as soon as possible .
Transaction : It's an executing program or access , such as reading or updating of database records .
Database System : The DBMS software together with the database itself , Sometimes the applications are also included
Database Management System " DBMS " : A system / package to facilitate the creation and maintenance "صيانه" of a database
Database Users
Actors on the scene
use and control the database content , design, develop and maintain database applications
Database Designers
Responsible to define the content, the structure, the constraints, and functions or transactions against the database They must communicate with the end-users and understand their needs.
Database Administrators
Responsible for authorizing access to the database, for coordinating and monitoring its use, acquiring
software and hardware resources, controlling its use and monitoring efficiency of operations
End-Users
They use the data for queries, reports and some of them update the database content
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Parametric
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Examples are bank-tellers or reservation clerks who do
this activity for an entire shift of operations
need to learn very little about the facilities
provided by the DBMS they simply have to understand the
user interfaces of the standard transactions designed and
implemented for their use
Sophisticated
These include business analysts, scientists, engineers,
others thoroughly familiar with the system capabilities
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Workers Behind The scene
Those who design and develop the DBMS software and related tools, and the computer systems operators