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Federated Databases

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1. What is a federated database and why are federated databases becoming increasingly common?

2. What are examples of databases in a work enviroment that could be federated?

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1. What is a federated database and why are federated databases becoming increasingly common?

"A federated database system is a type of meta-database management system (DBMS) which transparently integrates multiple autonomous database systems into a single federated database. The constituent databases are interconnected via a computer network, and may be geographically decentralized. Since the constituent database systems remain autonomous, a federated database system is a contrastable alternative to the (sometimes daunting) task of merging together several disparate databases. A federated database (or virtual database) is the fully-integrated, logical composite of all constituent databases in a federated database system.?(From http://en.wikipedia.org/wiki/Federated_database)

Another definition from Oracle: "A federated database is a logical unification of distinct databases running on ...

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7 paragraph discussion of federated databases

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Federated database

What is a federated database and why are federated databases becoming increasingly common? What are examples of databases in your current or previous work environment that could be federated?(I don't have any experience with this) how could the metadata be managed for a federated database?

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