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2 Overview : 2.1 Block-Level Incremental Backup : 2.1.4 Performing an Incremental Backup

In contrast, the following is the content of the archived base subdirectory of the same database from a subsequent incremental backup:
The information from the MBM files are consolidated into one file called a consolidated block map (CBM) file. During the restore operation for the incremental backup, the CBM file is used to identify the modified blocks to be restored for that backup.
See Section 5.4.3 for information on using the BACKUP subcommand to take an incremental backup.

2 Overview : 2.1 Block-Level Incremental Backup : 2.1.4 Performing an Incremental Backup

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