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Data abstraction in DBMS
- 1. The process ofhiding certain details from user is called Data Abstraction. Data Abstraction
- 2. VIEW-1 VIEW-2 VIEW-n VIEWLEVEL LOGICAL LEVEL PHYSICAL LEVEL Three Levels Of Data Abstraction
- 3. Representati on Structur e What is Schema ? 1Papan 18 Roll Name Age Papan 1 8 1
- 4. VIEW-1 VIEW-2 VIEW-n ExternalLevel Conceptual Level Internal Level User-1 User-2 User-n Database Three Schema Architecture VIEW LEVEL LOGICAL LEVEL PHYSICAL LEVEL Theoretical Model Web, Mobile Application
- 5. Data Transparency VIEW-1 VIEW-2VIEW-n External Level Conceptual Level Internal Level User-1 User-2 User-n Database VIEW LEVEL LOGICAL LEVEL PHYSICAL LEVEL
- 6. VIEW-1 VIEW-2 VIEW-n LOGICALLEVEL PHYSICAL LEVEL VIEW LEVEL 1. This is the highest level of abstraction. 2. Users does not need all kind of data, they need to access a part of the database and view level provides that. 3. It simplifies interaction with the user and provide multiple views. User-1 User-2 User-n
- 7. VIEW-1 VIEW-2 VIEW-3 LOGICALLEVEL PHYSICAL LEVEL VIEW LEVEL 1. This level describes what data are stored in the database. 2. what relationship amongst those data. 3. it also describes entire database in terms of small no of relatively simple structures.
- 8. VIEW-1 VIEW-2 VIEW-3 LOGICALLEVEL VIEW LEVEL 1.The lowest level of abstraction. 2. It describes how the data are actually stored. 3. it also describes the complex low level data structure in detail. PHYSICAL LEVEL
- 9. Database VIEW LEVEL LOGICAL LEVEL PHYSICAL LEVEL VIEW-1VIEW-2 VIEW-n Data Independence Video Information Gathering Designing, Voice Over User viewing Error Database Moved