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Discuss the differences among the candidate keys and the primary key of a relation. Give instance to describe your answer?
A candidate key is one that can be used as primary key which not null and unique constraint both is holding true. In short all primary keys are definitely candidate keys. That is one of the candidate keys is selected as primary key.
What is Thread splitting A thread of control is a path by which a set of state diagrams on that a single object is active at a time. Objects are shared between threads
How many levels can be viewed in Architecture of the database ? Architecture of the database can be viewed as three levels.
how draw er diagram
What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.
(a) Why did SAP introduce the extended star schema?
During the deletion of a tuple two cases can happen: Deletion of tuple in relation having the foreign key: In this type of case simply delete the desired tuple. For example, in
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
Whenever the LIMIT clause will be used? LIMIT is used for the following kinds of problems: 1) Answering questions about first or last and largest or smallest 2) Splitting
Define Deadlock detection If a system does not employ a few protocols that make sure deadlock freedom, after that a detection and recovery scheme should be used. An algorithm
how to construct labelled precedence graph for view serialiability.please explain insteps with one solved examples
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