#mapping constraints, Database Management System

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explain the mapping constraints

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Speedup Query Processing: A query that includes data at various sites can be split into sub-queries. These sub- queries can be implemented in parallel by various sites. Such parall

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Determine the Disadvantages of file based systems Some of the disadvantages of file based systems are like this: Data redundancy and inconsistency: the dissimilar applic

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What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.

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Explain Domain calculus Domain calculus is one of the types of the relational calculus. The formal specification of the domain calculus was planned after the development of the

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Explain Stand Alone Query Language in details? Stand alone Query Language - The query language that can be used interactively is known as stand alone query language. It does no

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Can a filed occur in several field groups. Yes.  But it leads to redundant data redundancy.

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What is Message switching Message switching transmits data units which can be arbitrarily long. Packet switching has a utmost packet size, if any message longer than that, it s

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What are called index-sequential files? The files that are ordered sequentially with a primary index on the search key are known as index-sequential files

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