MySQL Enterprise Backup User's Guide (Version 8.0.16)

1.3.2 Files Backed up for InnoDB Data

The InnoDB-related data files that are backed up include the ibdata* files (which represent the system tablespace and possibly the data for some user tables), any .ibd files (which contains data from user tables created with the file-per-table setting enabled), and the data extracted from the ib_logfile* files (the redo log information representing changes that occur while the backup is running), which is stored in a new backup file ibbackup_logfile.

If you use the compressed backup feature, the .ibd files are renamed in their compressed form to .ibz files.

The files, as they are originally copied, form a raw backup that requires further processing before it is ready to be restored. You then run the apply step (either as part of a copy-back-and-apply-log command or a backup-and-apply-log command, or as a separate apply-log command), which updates the backup files based on the changes recorded in the ibbackup_logfile file, producing a prepared backup. At this point, the backup data corresponds to a single point in time. The files are now ready to be restored, or for some other uses such as testing, reporting, or deployment as a replication slave.

Note

To avoid concurrency issues during backups of busy databases, you can use the --only-innodb option to back up only InnoDB tables and the associated data.