11,010,256 - Method and system for implementing current, consistent, and complete backup copy by rolling a change log backwards against a storage device
Abstract:A system and method of backing up an online database to a storage device is provided wherein the online database is actively changed by one or more applications. The backed up online database is then subsequently restored. The online database is backed up by copying the online database to the storage device, and during the copying of the online database, writing changes that are made to the online database to a change log for the portion of the online database that has already been copied to the storage device, and not writing changes that are made to the online database to the change log for the portion of the online database that has not yet been copied to the storage device. The changes in the change log are applied to the storage device by rolling the change log backwards, and applying only the most recent change contained in the change log for each data item in the storage device. The backed up online database is restored by loading the copied plurality of records in the online database from the storage device to a target database.