System for dynamically changing logical data structure of databa

Details System for dynamically changing logical data structure of databa System for dynamically changing logical data structure of databa

1996-05-10

1997-09-09

Black, Thomas G.

395613, G06F 1730

Patent

active

056665270

ABSTRACT:
A system for changing a logical data structure of a network type database in which an owner record is linked to member records by set-information identifying positions of the member records, the system includes a first unit for changing of a definition of a logical data structure of the network type database; and a second unit, when a member record to be linked to or linked to the owner record is added to or erased from the network type database in accordance with a changed logical data structure obtained by the first unit, for adding or erasing set-information of the added or erased member record to or from the set-pointer portion of the owner record, wherein an area of the set-pointer portion is changed in accordance with a variable-length management.

REFERENCES:
patent: 4042912 (1977-08-01), Bachman et al.
patent: 5307486 (1994-04-01), Nakamigawa
Suzuki et al, "A Database Control Function for Situations where Data may Increase Rapidly", Feb. 1981, pp. 1-15 Review of The Electrical Communication Laboratories vol. 29 No. 1-2.
Topper, "The PC-IDMS Alliance", 1988, p. 104(15) PC Tech. Journal, V6 N3.

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