Fujitsu Corporation

Takashi Ohshiro

Tadamitsu Ryu

Shingo Hirono

Tohru Matsumoto

Takanori Fukatsu

Yoshio Mogi

Toshio Takahara

Masahiko Murakawa

Gen Kakehi

Masao Tomita

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.

Distributed database system having a center system with a link file and

The present invention is a system that converts a vertical file (28) of time series data records from multiple terminals (10-14) and stored by time into a horizontal file (52) where records are organized by terminal (10-14). The user can then access the desired terminal information rapidly in the horizontal file (52) rather than having to perform an inefficient sequential search of the vertical file (28). After the terminal data is horizontally stored, the data is used to create display or print-out windows of the terminal data for many locations. Each window includes the data from a single terminal (10-14). For example, each window could include a graph of rain data for a location. The system also creates a cross reference table (76) of the addresses of the data used to create each window. When the display arrangement is altered, the data in the horizontal file (52/74) is reorganized to match the display order while only the physical addresses of the data for each terminal are changed in a new cross reference table (80).

Sampled data storage and editing system for the time series data being

Growing community of inventors

Kawasaki, Japan

Takashi Ohshiro