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Why did SAP introduce the extended star schema? Explain why it is reported to be better than the traditional schema model?
How does the system cope up with a record crash when recovery is going on after the first crash? Ans: In a system the undo and redo operations are needed to be idempotent to c
What is nested relational model? The nested relational model is an extension of relational model in which domains might be either atomic or relation valued.
Query Processor The query language processor is responsible for taking query language statements or shifting them from the English-like syntax of the query language to a form
to develop elrctronic database from manual forms
case study
An instance of relational schema R (A, B, C) has distinct values of A including NULL values. then A is a candidate key or not? If relational schema R (A, B, C) has distinct val
multidimensional data model
What is Candidate Key Super Key or Candidate Key: It is such an attribute of a table that can uniquely recognize a row in a table. Generally they have unique values and can n
It defines that the tuple in one relation that refers to another relation must refer to an existing tuple in that relation. This constraint is states on two relations (not essentia
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