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Replicating Data
One approach that may support efficient access to dissimilar applications as above may be to give access to every of the applications from dissimilar replicated files of the data. Each of the file may be prepared in a dissimilar way to serve the requirements of a dissimilar application. For instance, for the problem over, we may give an indexed sequential account file having accounted number as the key to account holders and the bank teller. A sequential file in the order of permissible loan limit to the Loan officers and a sorted sequential file in the order of balance to branch manager.
All of these files therefore differ in the organisation and would need different replica for dissimilar applications. Though, the Data replication brings in the problems of inconsistency under updating environments. Therefore, a better approach for data access for multiple keys has been proposed.
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assume we have the following apllicationthat model sccer team the games they play and the players inv each teamin the design we want to capture
what is stracture of dabms
It defines that no primary key value can be null. This is as the primary key is used to recognize individual tuple in the relation. So we will not be able to recognize the records
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