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packing the nodes of the tree on the disk given the access characteristics of the disk
...The work on data bases has been very much concerned with a concept called data independence
...There is a school of thought that says that says that applications in library automation and information retrieval should follow this path as well [6,7]...Nevertheless,it is worth taking seriously the trend away from user knowledge of file structures,a trend that has been stimulated considerably by attempts to construct a theory of data [8,9],which has become known as the relational model
...A second approach is the hierarchical approach
...The third approach is the network approach associated with the proposals by the Data Base Task Group of CODASYL
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are linked into a network in which any given link between two items exists because it satisfies some condition on the attributes of those items,for example,they share an attribute
...The whole field of data base structures is still very much in a state of flux
...Lurking in the background of any discussion of file structures nowadays is always the question whether data base technology will overtake all
...A language for describing file structures Like all subjects in computer science the terminology of file structures has evolved higgledy piggledy without much concern for consistency,ambiguity,or whether it was possible to make the kind of distinctions that were important
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