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Q2) DB2 architecture defining logical n physical data structure?
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Read this paper about logical and physical data structures.
In two words:
Logical: about entities, its data elements and relations between entities.
Physical: how things are implemented in the database, entities become tables, data elements fields, relations become FK's and a lot of performance related decisions (indexes, tablespaces, ...) and ease-of use (views, UDF's, SP's).
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Q3) on what model db2 is based?
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Relational calculus (?)