| 摘要 |
<p>The invention relates to a fault tolerant change distribution method in a distributed database system comprising at least two separate intercommunicating databases (SX1, SX2, MX1-MX6, RIH). At least part of the stored data is identical in the different databases. According to the invention, 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 said 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.</p> |
