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Problem
1 What is a Data Warehouse? Mention its advantages
2 Explain the Top-Down and Bottom-up Data Warehouse development Methodologies
3 What is Data Transformation? Explain the tasks involved in it
4 Why are the operational system keys not recommended for forming data warehouse primary keys? Give any two examples
what is specialization?
Single-Valued Dependencies A database is a collection of related information and it is therefore inevitable that some items of information in the database would depend on some
FDs in Entities : Student entity : Enrolment number → Student name, Address Course Entity :
what is the need of a log in dbms
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
What is persistency? Persistency ensures which data is stored and that after the object is no longer available (program stops running) the data will be available to other users
Define Direct file organization? The direct file organization is employed to enhance the performance in accessing the records than sequential file organization. In direct file
how to implement mid square hashing?
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
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