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I have been given 8 differebt data warehouseing failure case studies. I need to question 4 questions for each
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
Define query language? A query is a statement requesting the retrieval of information. The portion of DML that includes information retrieval is known as a query language.
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
brief history,definition,current trends and future trends if any of data fragmentation
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What is meant by software and hardware RAID systems? RAID can be executed with no change at the hardware level, using only software modification. Such RAID implementations are
What is the use of Union and intersection operation? Union: The result of this operation contains all tuples that are either in r1 or in r2 or in both r1 and r2.Duplicate tuple
Write short notes on Schema diagram. A database schema along with primary key and foreign key dependencies can be depicted pictorially by schema diagram. Every relation appea
Define the terms i) Key attribute ii) Value set Key attribute: An entity type usually has an attribute whose values are exact from each individual entity in the collection. Su
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