The fault-tolerant advantage of change in the method in a distributed database system

摘要

PCT No. PCT/FI93/00134 Sec. 371 Date Dec. 1, 1993 Sec. 102(e) Date Dec. 1, 1993 PCT Filed Mar. 31, 1993 PCT Pub. No. WO93/20524 PCT Pub. Date Oct. 14, 1993.A fault tolerant change distribution method in a distributed database system including at least two separate intercommunicating databases. At least part of the stored data is identical in the different databases. The changeable data items of the databases are provided with state fields, whereby, after a data item has been added, deleted or modified, the state field of the respective data item is set in a state which indicates that the change should be transmitted to another database. When the change has been transmitted to the other database, an acknowledgement of receipt of the change is awaited from the other database, whereafter the state field of the data item is set in a state which indicates that the change has been transmitted.