distributed ­database

distributed ­database

What is the difference between controlled and uncontrolled redundancy? Illustrate with examples.


What are the main reasons for and potential advantages of distributed ­databases?


Describe the two alternatives for specifying structural constraints on relationship types. What are the advantages and disadvantages of each?


Can an identifying relationship of a weak entity type be of a degree greater than two? Give examples to illustrate your answer.


4.1. What is a subclass? When is a subclass needed in data modeling?


4.7. What is the difference between a specialization hierarchy and a specialization lattice?

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