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Explain the Weak Entity Set
An Entity set which does not have sufficient attribute to make a primay key is known as weak entity set. For instance, dependents of an employee in an organization do not comprise an identifying attribute.
Explain the rules for creating a labelled precedence graph for testing view serializability. Ans: A schedule S is view serializable if it is view equivalent to a ser
prototype of a distributed information system for a national car part retail outlet chain.
Explain cursors in SQL? Cursors in SQL - An object used to store the output of a query for row-through-row processing through the application programs. Cursors are constructs
Define multivalued dependency and 4NF. Ans: Multivalued Dependency - Assume R be a relation schema and let α ⊆ R and β ⊆ R. The multivalued dependency α →→β holds o
What are the types of reference?explain it with suitable examples? Object oriented language given the ability to refer the object attribute of the type can be referred to the s
Explain Candidate Key and Super Key A super key is a set of one or more than attributes that, taken collectively, permits us to identify uniquely a tuple in the relation. Wher
File Manager File manager handles the allocation of space on disk storage. It starts and maintains the list of structures and indices described in the internal schema that is
What are the responsibility of File manager? File Manager : Manager allocation of space on disk storage and the data structures used to represent within stored on disk. It is a
Illustrate the State model for the ATM class let us take state model for the ATM class given below in Figure showing state model of the ATM class and the pseudo code derived fr
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
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