Distributed Databases

TL;DRAbstract

In this regard, distributed DBMSs are different from transaction processing systems as well, since the latter provide only some of these functions. 3. A distributed DBMS provides transparent access to data, while in a distributed file system the user has to know (to some extent) the location of the data. A DDB may be partitioned (called fragmentation) and replicated in addition to being distributed across multiple sites. All of this is not visible to the users. In this sense, the distributed database technology extends the concept of data independence, which is a central notion of database management, to environments where data are distributed and replicated over a number of machines connected by a network. Thus, from a users perspective, a DDB is logically a single database even if physically it is distributed. Architectural Alternatives Architecturally, a distributed database system consists of a (possibly empty) set

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