Data abs ind & mod

Topics for Today ,[object Object],[object Object],[object Object]

Data Abstraction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data Independence ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data Modeling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Popular Data Models ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data Abstraction ,[object Object],[object Object],[object Object],[object Object],[object Object]

3 Levels of Abstraction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3 Levels of Abstraction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Levels of Abstraction Figure taken from R2

Levels of Abstraction ,[object Object],[object Object],[object Object],[object Object],[object Object],Physical Schema Conceptual Schema View 1 View 2 View 3 Figure taken from R1

Instances & Schemas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Instances & Schemas ,[object Object],[object Object],[object Object],[object Object],[object Object]

Example: University Database ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ANSI/SPARC 3-Tier Architecture ,[object Object],[object Object],[object Object],[object Object],*ANSI/X3/SPARC study group on DBMSs. Interim Report, FDT. ACM SIGMOD Bulletin, 7(2), 1975.

ANSI/SPARC 3-Tier Architecture Physical Schema Conceptual Schema View 1 View 2 View n External Level Conceptual/Logical Level Internal Level … Database User 1 User 2 User n Logical DI Physical DI E/C Mapping C/I Mapping

Data Independence ,[object Object],[object Object],[object Object],[object Object],[object Object]

Data Independence ,[object Object],[object Object],[object Object]

Data Independence ,[object Object],[object Object],[object Object],[object Object]

Data Modeling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data abs ind & mod

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