Global Patent Index - EP 1082676 A1

EP 1082676 A1 2001-03-14 - DISTRIBUTED DATABASE SYSTEM

Title (en)

DISTRIBUTED DATABASE SYSTEM

Title (de)

VERTEILTES DATENBANKSYSTEM

Title (fr)

SYSTEME DE BASE DE DONNEES DISTRIBUEE

Publication

EP 1082676 A1 (EN)

Application

EP 99955549 A

Priority

  • GB 9901782 W
  • GB 9812221 A

Abstract (en)

[origin: WO9964966A1] A distributed database system has a plurality of separate nodes each including a data store to hold a duplicate copy of a set of data, the data stores being updated by a process in which a first one of the nodes initiates communication with another one of the nodes, the first and said another node then performing a comparison process to establish whether their stored sets of data are duplicates of each other, and if they are not duplicates to exchange data between them so that their stored sets of data are duplicates of each other, the invention providing that the rate at which the first node initiates communication with other nodes for said comparison process is influenced by the rate of arrival of data updates at the first node, an increase in the rate of arrival of updates tending to increase the frequency with which the first node initiates said comparison process. This rate may be subject to upper and lower thresholds. The system may be one based on a time stamped anti-entropy consistency protocol.

IPC 1-7 (main, further and additional classification)

G06F 17/30

IPC 8 full level (invention and additional information)

G06F 17/30 (2006.01)

CPC (invention and additional information)

G06F 17/30575 (2013.01)

Citation (search report)

See references of WO 9964966A1

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

WO 9964966 A1 19991216; EP 1082676 A1 20010314; GB 9812221 D0 19980805

INPADOC legal status


2004-07-07 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20040103

2001-03-14 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20001220

2001-03-14 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB