Database system and disaster tolerance method thereof

The invention is suitable for the technical field of computers, and provides a database system and a disaster tolerance method thereof, and the database system comprises a local host device, a same-machine-room slave device, a same-ground cross-machine-room slave device, a cross-ground slave device and a data verification module; wherein the local host equipment and the same-machine-room slave device are located at a first position of a first city, the same-ground cross-machine-room slave device is located at a second position of a first city, and the cross-ground slave device is located at any position of a second city; and the data verification module is used for performing data consistency verification based on a log file of the local host device and the log file of the slave device inthe same machine room when the local host device fails. The disaster tolerance capacity of the database system is improved by arranging the slave devices locally and remotely, and when a host devicebreaks down, data consisten