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Lecture1 - What are the major features of a distributed...

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What are the major features of a distributed database? It’s a collection of logically-interrelated data. Composed of autonomous databases at more than one distributed sites, and the sites are linked into a communication network. The data at one site are available to users at other sites. Data integrity is maintained in case of unpredictable hardware and/or software failure. Data integrity involves data consistency, accuracy, and validity. Data partitioning – Table data can be split into non-overlapping slice, called fragments, which can be stored on different sites. Data replication – the copies of the same data partition can be stored at multiple sites. No reliance on central site. The DBMS at each site handles the local data and applications autonomously. Data transparency – data location, fragmentation, and replication independence. The users are not aware of the physical data location.
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