Distributed database system having a center system with a link file and a method for retrieving data from same
First Claim
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1. A data retrieval method in a distributed database system comprising the steps of:
- (a) associating commands defining attributes of database data with at least one keyword in each of a plurality of terminals connected to a center system;
(b) managing command names to which keywords are assigned in units of keywords in each of the terminals in dependence upon a keyword contents file in each of the terminals;
(c) managing in the center system a terminal number of terminals in which keywords are registered in units of keywords in dependence upon a keyword link file in the center system; and
(d) retrieving data in one of the terminals when a keyword is specified by locating a command name associated with a specified keyword in dependence upon one of a keyword contents file and a command name associated with a specified keyword located in the keyword contents file in the terminal specified by the terminal number located using the keyword link file.
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Abstract
A data retrieval method and apparatus in a distributed database system. Data is retrieved from a distributed database quickly with a minimum load on each terminal. A contents file is provided in each terminal, and a link file is provided in a center system to coordinate access to the distributed data in each terminal.
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Citations
17 Claims
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1. A data retrieval method in a distributed database system comprising the steps of:
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(a) associating commands defining attributes of database data with at least one keyword in each of a plurality of terminals connected to a center system; (b) managing command names to which keywords are assigned in units of keywords in each of the terminals in dependence upon a keyword contents file in each of the terminals; (c) managing in the center system a terminal number of terminals in which keywords are registered in units of keywords in dependence upon a keyword link file in the center system; and (d) retrieving data in one of the terminals when a keyword is specified by locating a command name associated with a specified keyword in dependence upon one of a keyword contents file and a command name associated with a specified keyword located in the keyword contents file in the terminal specified by the terminal number located using the keyword link file. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A distributed database system, comprising:
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a plurality of terminals, more than one having distributed individual databases and each having a contents file, said contents file being adapted to store a correspondence between command names and keywords in units of keywords; a public network, connecting said plurality of terminals; and a center system having a link file which is adapted to allow management of information for locating those of said terminals in which a given keyword is registered, each of said plurality of terminals accessing said center system when a given keyword is requested and the given keyword is not registered at that terminal. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification