The Small Contractor and the Small ComputerStanford University, 1980 - 87 pages |
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Page 24
Por exæple , let's look at the payroll record Figure 2-6 . The name of the individual is obviously whom the record is built around and the other elements help for the complete record . A data file is made up of a group of these records ...
Por exæple , let's look at the payroll record Figure 2-6 . The name of the individual is obviously whom the record is built around and the other elements help for the complete record . A data file is made up of a group of these records ...
Page 25
Records , sequenced by key field , stored in consecutive order . Tape Drive Head Tape Direction - # 1 # 2 # 3 # 4 # 5 Figure 2.8 - Sequential Organization and Processing Sketch Diskette Rotation Motions Record # 1 Record # 4 Seek ...
Records , sequenced by key field , stored in consecutive order . Tape Drive Head Tape Direction - # 1 # 2 # 3 # 4 # 5 Figure 2.8 - Sequential Organization and Processing Sketch Diskette Rotation Motions Record # 1 Record # 4 Seek ...
Page 27
The advantage of direct access processing is that one does not have to proceed sequentially through all the records . A disadvantage is that a greater access time is required for positioning of the proper track and sector .
The advantage of direct access processing is that one does not have to proceed sequentially through all the records . A disadvantage is that a greater access time is required for positioning of the proper track and sector .
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Contents
THE SMALL COMPUTER ELEMENTARY CONCEPTS | 5 |
5 | 20 |
THE SMALL CONSTRUCTION CONTRACTING ENVIRONMENT | 33 |
Copyright | |
6 other sections not shown
Common terms and phrases
accounting advantages agreement alternative application arrangement attempt basis begin benefits better called changes Chapter common complete computer system consideration considered construction contract contractors cost data base deal decision defined depends determine devices difficult discussed disk documentation effects environment errors established examined example execution exist failure Figure Finally firm function future given hardware human implementation important in-house information system installation insure involves issues knowledge language lease look machine maintenance manual memory method nature necessary needs objectives Once operating operating system organization packages particular perform period personnel physical present problems programs purchase reason record reference relates requirements reviewed scheme service bureaus situation specific storage tape tasks term terminals testing things Three types understand usually vendor