How to implement backup function in real-time database management system (DBMS)

摘要

It is an object of the present invention to provide a method of realizing a backup function in a real-time DBMS having a guarantee of consistency of data and a high speed so as to satisfy an exchange backup function condition, A second step of recording a change in a change buffer necessary for backup, a second step of creating a log, which is a form applied to a disk based on the change buffer, A third step of storing the received log in a spool, a fourth step of determining whether or not the log exists in the log spool storing the received log, and backing up the log to the disk if the log exists, To ensure that only the master processor is backed up and that no other processors are backed up, And, in the case of system restart it has a sixth step of copying the DB within the overlapping relation to the location of the other processor overlapping relation in the database (DB) of the master processors for the matching of the overlapping relation data.