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Some operations are very efficient on sequential files (e.g. finding averages) ... simply placed one after another with no additional structure. ...
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Figure 10-1 shows the tree structure of a sequential file. ... Figure 10-1 Tree Structure for Sequential Files ... The tree structure of relative files also begins with the FILE HEADER and FILE ATTRIBUTES structures. From the FILE ATTRIBUTES structure, the next structure down is the PROLOG. The first structure down from the...
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To unify the discussion of file structures we need some further concepts ...1 the K pointers are distinct;2 each non null K pointer in L gives the address of a record within L;3 there is a unique record in L not pointed to by any record containing K;it is called the beginning of the list ... Information structure...
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Data files are organized in such a way that related date is grouped into records. In some languages there is a formal record structure. In Visual Basic you will simulate records by writing related data items, called fields , at the same time. ... Programs that create sequential files in Visual Basic have three parts.
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The fields are not necessarily constant in length ...In the same picture I have also shown some fields labelled Pi ...To indicate that a record is the last record pointed to in a list of records we use the null pointer logicaland .....
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A file is a data structure that is used whenever we wish to scan a sequence of values in one direction, examining each component in the sequence consecutively. ... A sequential file may be inspected (but not altered) one element at a time, starting at the beginning.
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Serial Files (COBOL calls these Sequential Files) ... Each record occurrence in a file will have a different value but every record in the file will have the same structure.
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This document provides a guide to the structure and description of the current sequential files contained in the Ambulatory Care Data base (ACDB). Each record contains 58 fields that includes encounter data, patient data and provider data. ... Accession Number : ADA250950 ... Descriptive Note : Initial rept. Nov 91-Mar 92,
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What are the differences between random hashed files and index files? Compare and contrast both these non-sequential file structure models. - Compare the two non-sequential file structure models: the random (hashed) file and the index file.
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using the following terms: Index-sequential file; Information content; Information measure; Information Radius; Information retrieval definition; Information retrieval system; Information structure; Informational correlation measure;
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Structure of Sequential Files
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