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Distributed Control and Data sharing:The geographical distribution of an organization can be showed in the distribution of the data; if a number of different sites are linked to each other, then a user at single site may be able to access data that is available at another site. The main benefit here is that the user does not want the site from which data is being accessed. Data can be placed at the site near to the users who normally use that data. The local control of data permits establishing and enforcement of local policies regarding use of local data. A global database administrator (DBA) is responsible for the whole system. Usually, part of this responsibility is given to the local administrator, so that the local DBA can manage the local DBMS. Therefore in the distributed banking system, it is feasible for a user to get his/her information from any branch office. This external mechanism would, in effect to a user, look to be a one centralised database.
The primary benefit of accomplishing data sharing by means of data distribution is that every site is able to retain a degree of control over data stored locally. Depending upon the design of the distributed database system, every local administrator may have a dissimilar degree of autonomy. This is often a major benefit of distributed databases. In a centralised system, the database administrator of the central site manages the database and, therefore, no local control is possible.
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