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2 Overview : 2.1 Block-Level Incremental Backup : 2.1.3 WAL Scanning – Preparation for an Incremental Backup

The WAL scanner determines which blocks have been modified and records the information in a file called the modified block map (MBM) file. One MBM file is created for each WAL file.
The MBM file is stored in the archive path directory backup_path/server_name/archived_wals
backup_path is the BART backup catalog parent directory specified in the global section of the BART configuration file.
server_name is the lowercase conversion of the database server name specified for this database server in the server section of the BART configuration file.
Note: Under certain circumstances such as when the rsync utility is used to copy WAL files to the BART backup catalog, the WAL files may have been missed by the WAL scanner program for scanning and creation of MBM files. Use the scan_interval parameter in the BART configuration file to force scanning of WAL files in the archive directory of the BART backup catalog to ensure MBM files are generated. See sections 4.1, 4.2.5, and 5.5 for information.
See Section 5.5 for information about using the WAL scanner.

2 Overview : 2.1 Block-Level Incremental Backup : 2.1.3 WAL Scanning – Preparation for an Incremental Backup

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