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(a) Data warehouse can be defined as "a subject-oriented, integrated, time-variant, non-volatile collection of data" in support of management's decision making process. Explain each of the above concept and support your answer with appropriate example.
(b) Provide three main benefits that a company will gain by implementing a data warehouse.
(c) Give any three problems associated with the implementation of a data warehouse.
(d) What is a Data Mart? Discuss how Data Marts differ from data warehouses and identify any two reasons for implementing a Data Mart.
Define the basic operations of the relational algebra? Ans: Basic operators of relational algebra are: 1. Union (∪) - Selects tuples which are in either P or Q or in bot
properties of derirable decomposition
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
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What should be declared explicitly in the corresponding ABAP/4 Statements to access internal tables without header lines & why? Work Area. This is needed as the Work Area is
What are the authentication modes in SQL Server? How can it be changed? Windows mode and Mixed Mode - SQL and Windows. To alter authentication mode in SQL Server click Start, P
Explain weak and strong entity sets? Weak and Strong entity sets: A physically powerful entity set has a primary key. All tuples in the group are distinguishable through that k
Key to represent relationship amongs tables is called ? A Key that represent the relationship between tables is called Foreign Key.
What is System R? What are its two major subsystems? System R was intended and developed over a period of 1974-79 at IBM San Jose Research Center. It is a prototype and its pur
What is NULL? Simply NULL means not in value.
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