mysqlhotcopy is a Perl script for backing up MySQL tables stored in either the MyISAM or ARCHIVE engines. It works very fast because it doesn't dump the contents of the tables. Instead it takes advantage of the fact that MyISAM tables are contained in separate files, and simply locks the tables and copies the flat files.

Example Setup

  1. Create a user in MySQL for running mysqlhotcopy. The user will need to be granted the SELECT, RELOAD and LOCK TABLES privileges on the databases that will be backed up. In this example, I want all databases to be backed up:

    mysql> CREATE USER `mysqlhotcopy`;
    mysql> GRANT SELECT, RELOAD, LOCK TABLES ON *.* TO `mysqlhotcopy`@`localhost`;
  2. Create a daily cron job to backup every database, except for information_schema, which is a dynamic schema created my the MySQL server itself and does not exist as files on the filesystem. An example script is:

    for database in $(mysql --user mysqlhotcopy           \
                            --batch                       \
                            --skip-column-names           \
                            --execute 'SHOW DATABASES;' | \
                      grep -v '^information_schema$')
        mysqlhotcopy $database /root/mysql-dumps/ --allowold --keepold --user=mysqlhotcopy

    This script maintains one previous copy of the databases, by renaming the directory, appending the suffix _old to the name.

See also

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