MASTER-SLAVE RELATION INFORMATION SYNCHRONIZATION SYSTEM IN DECENTRALIZED DATABASE

摘要

PROBLEM TO BE SOLVED: To make efficiently synchronizable updated data in a decentralized database system of multiple servers having a master-slave relation between a master table and a slave table while maintaining the master-slave relation. SOLUTION: A main table (dummy) 93 is provided in a relational database (slave) 9 on a slave server 7 and the master-slave relation is defined between the master table (dummy) 93 and a slave table (copy) 92. A log monitor means 5 periodically monitors whether or not an update log file 4 is updates according to update log information outputted when a master table (master) 31 is updated in a relational database (master) on a master server 1. An update reflecting process means 6 reflects the update contents on the master table (dummy) 93 in the relational database (slave) 9 in the slave server 7 according to the latest update log information of the update log file 4 when the log monitor means 5 detects the update of the update log file 4.