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Explain how the associations are implemented as classes.
A general approach in this case is to transform an association class into a simple class linked to two original classes with the two new associations, as shown in Figure.
Figure: Transforming the association into a class
Explain Thomas' Write rule. Show how it is different from timestamp ordering protol Ans: In timestamp-based concurrency control the thomas Write rule is a rule. Given a Timest
Define access time. Access time is the time from when a read or write request is issued to when data transfer starts.
List two restrictions that are applied on the modification (updation, insertion or deletion) of base tables through view. Ans: The two restrictions are: 1. If a view
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Explain the main advantages of DBMS over File Oriented System ?
Scenario: You are a freelance database designer who has just been contacted by a small software development company named Altair Software. The president of the company has asked
Which database level is closest to the users? External database level is closest to the users.
Question: This form represents one of a number used for each sailing of a range of boats. A passenger may go on many sailings and will have the same passenger number for each.
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
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