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Nature of Data and Information
File Design Considerations
15 other sections not shown
access storage device active data values ADABAS added record Available Head Pointer Base Management Systems base record blocking factor bytes child node COBOL CODASYL commands component contains Data Base Management Data Description Language DATA HEAD POINTER Data Manipulation Language data record data-items database processing database record DATACOM/DB DBTG database model deleted direct access file direct access storage example Figure file organization given data given file given record hierarchical database IDMS Index Area indexed sequential file initial linear search LINK value logical records magnetic tape n-tuple NUMBER FINAL GRADE occurrence one-to-many one-to-many relationship one-way linked list overflow area parent node physical record primary key value Prime Data Area prime number punched cards record type retrieved schema secondary key segment STUDENT NUMBER FINAL STUDENT-NUMBER subschema technique terminology to-be-added track traditional file processing tree data structure tree structure update