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I have been given 8 differebt data warehouseing failure case studies. I need to question 4 questions for each
why are older data base model are being replaced by new data model
Advantages of Data Distribution The primary benefit of distributed database systems is the ability to access and share data in a reliable and efficient manner.
Entity types that do not have any key attribute, and therefore cannot be identified independently, are known as weak entity types. A weak entity can be recognized uniquely only by
Why older data models are being replaced by new data modelling 100 words accepted#
Relations create the database. They must satisfy various properties, like no duplicate tuples, no ordering of tuples, and atomic attributes, etc. Relations that satisfy these basic
How external/conceptual mapping and conceptual /internal mapping is performed
what problems are raised by the database? why is it so controversial? why is data quality an issue?
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
Give the reasons for allowing concurrency? The reasons for allowing concurrency is if the transactions run serially, a short transaction might have to wait for a preceding long
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