NDLI: Multi-level data model in DPLS: database, dynamic program control & open-ended POL support

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Multi-level data model in DPLS: database, dynamic program control & open-ended POL support

Content Provider	ACM Digital Library
Author	Tsubaki, Masaaki
Abstract	A multi-level or three-level data model is introduced in DPLS -- Database, Dynamic Program Control and Open-Ended POL Support. The first ievel is logically the highest "Information Structure Model" where "Entity, Attribute and Value" are the bases for formalizing information. A logical database is composed of as many logical subfiles as the number of defined entity types. The second level is the "Data Structure Model" where the logical subfiles are broken down into physical subfiles in consideration of unused space, redundancy, variable length data, access efficiency, security, integrity, maintenance, etc. A physical subfile is a collection of stored records with the simplest rectangular form. The third level is the "Storage Structure Model" where physical subfiles are given the required number of pages in the data sets. These clearly separated three-level data representations produce a high degree of data independence and storage device independence, which support system designers with orthogonal system decomposition.
Starting Page	538
Ending Page	539
Page Count	2
File Format	PDF
ISBN	9781450339209
DOI	10.1145/1282480.1282541
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1975-09-22
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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