Patent ID: 6910053
Filing Date: 2005-06-21
Classification: G06F,Y10S

Abstract:
1. A method for data maintenance in an offline-distributed database network system, the database network system comprising a central system having a central database, and a plurality of node systems having local databases, the local databases capable of containing different subsets of data from the central database, the method comprising: recording change information relating to data stored in at least one of the central and local databases in the database network system in at least one of the plurality of node systems; transmitting a replication object including the change information, if an online connection is available, from said at least one of the node systems to the central system or from the central system to said at least one of the node systems, the recipients of the replication object being determined based on at least one lookup table in the central system; and updating said at least one lookup table in accordance with the change information of the replication object; wherein said at least one lookup table includes a first-type lookup table and a second-type lookup table, the first-type lookup table containing an allocation between types of structure of replication objects and responsible node systems, the second-type lookup table containing an allocation between entities of replication objects and responsible node systems, the responsible node systems being responsible for the replication object in the database network system.