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INFORMATION SYSTEMS STRUCTURES
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access algorithm access block assume attribute batch processing Chapter cluster COBOL complex concept consolidated file contains corresponding data base system data entries data pointers data structures data terms data transport datalogical defined definition direct processing directory files directory-file pair distinct elementary entry identifiers entry points example file design file directory file records file storage file structure file system function incidence matrix infological model information contents information kind information precedents information system input instance interaction interactor main file main memory method number of accesses number of objects object class object references object system operation output overlapping particular person possible precedence bundle precedence relations primary address primary storage process design process grouping property file entry pseudo-randomizing reference period represented request require retrieval query schema secondary storage segments serial access situation specified stored strategy subsystem system design tape users