Copying the delay automatic restoration methodological null master data of the finite difference copy in the data based

摘要

PPROBLEM TO BE SOLVED: To provide a technique for detecting properly a delay of refreshing processing. PSOLUTION: This data system copies nonsynchronously a master data and generates a replica data. The data system includes a master site 1 having master tables 11a, 11b, and a dummy table 12, a replica site 3 having replica tables 31a, 31b, and a dummy replica table 32, a monitoring part 38 for writing periodically a dummy data into the dummy table 12, and a copy processing part 37 for differential-copying the master data stored in the master tables 11a, 11b periodically into the replica tables 31a, 31b, and for differential-copying periodically the dummy data from a dummy master table 13 into a dummy replica table 33. The monitoring part 38 monitors a time required for the differential copy, referring to the dummy replica table 33, and executes automatic restoration when delayed. PCOPYRIGHT: (C)2010,JPO&INPIT