International Business Machines Corporation
Global coherency for distributed data sources

Abstract:

A computer implemented method for enabling data coherency between a first data source and a second data source of different structure may be provided. The first data source has a first format and a related first log file. Similar conditions apply to the second data source. The method comprises also determining a first entry in the first log file at which the data have a semantic consistency and storing this as first read barrier. The same applies for an entry in the second data source. Additionally, the method comprises building a third data set derived from data of the first data source and data of the second data source and being coherent with them, using data from the first data source up to the first read barrier and data from the second data source up to the second read barrier.