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Automatic Distributed Database Linking Multiple IBM Personal Computers Through a Local Area Network System

IP.com Disclosure Number: IPCOM000039418D
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Caraballo, JF: AUTHOR [+5]

Abstract

A technique is described whereby a software distributed database program enables multiple stations, using the IBM Personal Computers (PCs) interconnected by means of a local area network (LAN), to function as master/slave inter-relating devices. The software provides different configurations for a station so that any PC in the system may be in a master state or a slave state. Each station is provided with an instruction table describing the station as being the master or slave. At start-up time, the table indicates the specific station as the master and will pass control to a linking software module that will configure the software so that this station has the master environment. All other stations then become the slave stations.

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Automatic Distributed Database Linking Multiple IBM Personal Computers Through a Local Area Network System

A technique is described whereby a software distributed database program enables multiple stations, using the IBM Personal Computers (PCs) interconnected by means of a local area network (LAN), to function as master/slave inter-relating devices. The software provides different configurations for a station so that any PC in the system may be in a master state or a slave state. Each station is provided with an instruction table describing the station as being the master or slave. At start-up time, the table indicates the specific station as the master and will pass control to a linking software module that will configure the software so that this station has the master environment. All other stations then become the slave stations. Master and slave stations are in constant communications with each other for updating the database at each of the slaves and the master, using multicast message functions in the LAN. This provides multiple databases, in the event a malfunction occurs at any one station. The program is unique in that should a malfunction occur at the master station, by updating the table of a slave station, the slave station can become the master. Each station in the system has a complete image of the database stored in its random-access memory (RAM). The system database is checked at every group of updates so that in the event of a catastrophic malf...