May 2023
Intermediate to advanced
416 pages
8h 17m
German
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Kapitel 16: Index-sequenzielle Dateiorganisation
Der Vorteil der Index-sequenziellen Dateien liegt darin, Datensätze einer solchen Datei sequenziell oder wahlfrei verarbeiten zu können. Der Aufbau einer Index-sequenziellen Datei bedarf der Angabe eines Schlüsselfelds, das innerhalb des Datensatzes liegen muss. Dieser Schlüssel ist der Ordnungsbegriff des Datensatzes, der für das Aufsuchen eines Satzes im wahlfreien Zugriffsmodus verwendet wird.
Für eine Index-sequenzielle Datei, die in COBOL erstellt wird, werden zwei Datenbestände erzeugt: Der erste Datenbestand enthält logische Datensätze, die vom Anwender erfasst werden. Der zweite Datenbestand enthält Verwaltungsinformationen, die automatisch vom System generiert und gepflegt werden; er ...
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