There are two algorithms in use to find the set of such pages to be copied.
#Commander one preparing to copy files full#
An incremental backup copies each page whose LSN is newer than the previous incremental or full backup's LSN. Each page's LSN shows how recently it was changed. The LSN is the system version number for the entire database. Incremental backups work because each InnoDB page (usually 16kb in size) contains a log sequence number, or LSN. You can perform many incremental backups between each full backup, so you can set up a backup process such as a full backup once a week and an incremental backup every day, or full backups every day and incremental backups every hour.
It copies only the data that has changed since the last full backup. Other Types of Backups Incremental Backups There are several variations on these functions to accomplish different tasks, and there are two less commonly used modes, -stats and -print-param. The tool runs in either -backup or -prepare mode, corresponding to the two main functions it performs. The MySQL client libraries are used to parse command-line options and configuration file. The InnoDB libraries provide the functionality to apply a log to data files. Xtrabackup enables point-in-time backups of InnoDB / XtraDB tables together with the schema definitions, MyISAM tables, and other portions of the server. The xtrabackup binary is a compiled C program that is linked with the InnoDB libraries and the standard MySQL client libraries. Xtrabackup - Percona XtraBackup 8.0 Documentation
Incremental Streaming Backups Using xbstream.
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