Title:
METHOD AND APPARATUS FOR MANAGING VALIDITY TIME OF DATA IN DISTRIBUTED PROCESSING SYSTEM AND RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2000/054157
Kind Code:
A1
Abstract:
In a distributed system in which data is copied in response to a request of data from an operator, and the specifying of a data s ource, the information on identifying the version, and the validity time are recorded, a device on the data use side (1) checks t he validity time of the copy, provides the copy if the validity time has not expired yet, reads the latest data from a device holding the data source if the validity time has already expired, and makes a new copy and attribute information, (2) receives the instruction to alter the validity time of the copy held by the device, and (3) updates the validity of the corresponding copy according to the instruction; and a device on the data management side (4) records 'the specifying of the data source, the information on identifying the version, and the validity time' of the data the validity time of which has been updated, and (5) takes out records of the data source indicated by the device on the data use side out of the records, and transmits the records taken out to the data use side requesting the data.
Inventors:
KAMIMURA KUNIO (JP)
Application Number:
PCT/JP1999/001107
Publication Date:
September 14, 2000
Filing Date:
March 08, 1999
Export Citation:
Assignee:
ATHENA TELECOM LAB INC (JP)
KAMIMURA KUNIO (JP)
KAMIMURA KUNIO (JP)
International Classes:
G06F17/30; (IPC1-7): G06F12/00; G06F9/06; G06F13/00
Domestic Patent References:
| WO1997036233A1 | 1997-10-02 |
Foreign References:
| JPH06215031A | 1994-08-05 | |||
| JPH06243013A | 1994-09-02 |
Other References:
"GEKKAN SUPER ASCII", SUPER ASCII - GEKKAN SUPA ASUKI, ASUKI, TOKYO,, JP, vol. 08, no. 11, 1 November 1997 (1997-11-01), JP, pages 102 - 115, XP002932919, ISSN: 0917-7116
"PUSH TECHNOLOGY DE JOUHOU BUSOU SHIYOU", INTERNET MAGAZINE - INTANETTO MAGAJIN, IMPURESU, TOKYO, JP, no. 31, 1 August 1997 (1997-08-01), JP, pages 278 - 289, XP002932920, ISSN: 1344-6878
"PUSH TECHNOLOGY DE JOUHOU BUSOU SHIYOU", INTERNET MAGAZINE - INTANETTO MAGAJIN, IMPURESU, TOKYO, JP, no. 31, 1 August 1997 (1997-08-01), JP, pages 278 - 289, XP002932920, ISSN: 1344-6878
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