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By J. Paredaens, L. Tenenbaum

Advanced details expertise is pervasive in any form of human task - technological know-how, company, finance, administration and others - and this is often quite real for database structures. either database concept and database purposes represent an important a part of the cutting-edge of laptop technology. in the meantime there's a few discrepancy among assorted features of database job. Theoreticians are often now not a lot conscious of the true wishes of industrial and undefined; software program experts no longer continuously have the time or the apportunity to get accustomed to the latest theoretical rules and traits, in addition to with complex prototypes bobbing up from those rules; power clients frequently shouldn't have the potential for comparing the theoretical foundations and the capability useful impression of alternative advertisement items. So the most aim of the direction used to be to place jointly humans thinking about diverse facets of database task and to advertise lively alternate of rules between them.

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We will discuss them now. File management consists of the management of a number of sequential of direct or indirect access files. The program the have to be written by the users essentially read and write Foundations of Databases Systems 31 records on files. The total responsibility of the correctness of the software is with the users. The main disadvantages are: • data redundancy and inconsistency • difficulty in accessing data • different formats of data • concurrent access anomalies • security problems • integrity problems The first two real DBMS's were the network and the hierarchical model.

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