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Database and DBMS introduction

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Ion Zaharia

on 8 December 2012

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Transcript of Database and DBMS introduction

Shared collection: Defined once and used by all departments within an organisation (“shared”) Logically related: Contains data that is related (branch-staff or between departments) Description of this data: Metadata (system catalog or data dictionary). Informational needs of an organisation Database Management System A software system that enable users to define, create, and maintain the database and provides controlled access to this database DBMS Components Hardware
Data (bridge)
People. Relations? Database environment Data administrator
Database administrator
Database designers.
Application programmers
End users Advantages and disadvantages of DBMS ? Advantages: Improved data sharing
Improved data security
Better data integration
Minimized data inconsistency
Improved data access
Improved decision making
Increased end-user productivity Disadvantages Increased costs
Management complexity
Maintaining currency
Frequent upgrade/replacement cycles Yogurt ------------- Database A shared collection of logically related data (and a description of this data), designed to meet the information needs of an organisation. What is a database
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