shadow copy, Database Management System

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why shadow copy technique is used?

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What is the use of sub queries? A sub query is a select-from-where expression that is nested with in another query. A common use of sub queries is to do tests for set membershi

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Design Of Distributed Databases: The distributed databases are mainly relational at local level. So a local database schema is the similar as that of a centralised database design

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How many levels can be viewed in Architecture of the database ? Architecture of the database can be viewed as three levels.

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List the drawbacks of relational database system A) Repetition of data B) Inability to s certain information.

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