Create an individual partitions backup¶
Percona XtraBackup lets you back up
individual partitions because partitions are regular tables with specially formatted names. The only requirement for this feature is to enable the innodb_file_per_table option
on the server.
There is one caveat about using this kind of backup: you can not copy back the prepared backup. Restoring partial backups should be done by importing the tables.
There are three ways of specifying which part of the whole data will be backed
up: regular expressions (--tables), enumerating the
tables in a file (--tables-file) or providing a list of
databases (--databases).
The regular expression provided to this option will be matched against the fully
qualified database name and table name, in the form of
database-name.table-name.
If the partition 0 is not backed up, Percona XtraBackup cannot generate a .cfg file. MySQL 8.0 stores the table metadata in partition 0.
For example, this operation takes a back-up of the partition p4 from
the table name located in the database imdb:
$ xtrabackup --tables=^imdb[.]name#p#p4 --backup
If partition 0 is not backed up, the following errors may occur:
The error message
xtrabackup: export option not specified
xtrabackup: error: cannot find dictionary record of table imdb/name#p#p4
Note that this option is passed to xtrabackup --tables and is matched
against each table of each database, the directories of each database will be
created even if they are empty.
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