DATABASE SYSTEM, AND REPLICA DATA UPDATE METHOD IN DATABASE SYSTEM

摘要

PPROBLEM TO BE SOLVED: To distribute a refresh processing load to copy a master data on a master site as a replica data of a slave site. PSOLUTION: A database system includes a plurality of master nodes 11, a plurality of replica nodes 31, and a load distribution device 50. The load distribution device 50 includes: a replica selection section 52 for selecting one replica node from which a refresh request of a replica data 351 is issued from the plurality of replica nodes 31; and a master selection section 54 for selecting one master node 11 which responds to the refresh request issued from the replica node selected by the replica selection section 52 upon receipt of the refresh request. The replica node selected by the replica selection section 52 issues the refresh request, and updates replica data after acquiring master data from the master node selected by the master selection section 54. PCOPYRIGHT: (C)2010,JPO&INPIT