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US 5,634,048 AGranted
Distributed database system having a center system with a link file and a method for retrieving data from same
AssigneeFujitsu Limited
InventorsTadamitsu Ryu, Toshio Takahara, Shingo Hirono, Tohru Matsumoto, Gen Kakehi, Yoshio Mogi, Takanori Fukatsu, Masao Tomita, Takashi Ohshiro
Life of this patent
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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.
Claims17
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.
2 more elements
A distributed database system, comprising:
- 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.
1 more element
Dependencies are inferred from the claim text.