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5.5.2. mysql_upgrade — Check Tables for MySQL Upgrade

mysql_upgrade should be executed each time you upgrade MySQL. It checks all tables in all databases for incompatibilities with the current version of MySQL Server. If a table is found to have a possible incompatibility, it is checked. If any problems are found, the table is repaired. mysql_upgrade also upgrades the system tables so that you can take advantage of new privileges or capabilities that might have been added.

All checked and repaired tables are marked with the current MySQL version number. This ensures that next time you run mysql_upgrade with the same version of the server, it can tell whether there is any need to check or repair the table again.

mysql_upgrade also saves the MySQL version number in a file named in the data directory. This is used to quickly check if all tables have been checked for this release so that table-checking can be skipped. To ignore this file, use the --force option.

To check and repair tables and to upgrade the system tables, mysql_upgrade executes the following commands:

mysqlcheck --check-upgrade --all-databases --auto-repair

mysql_upgrade currently works only on Unix. On Windows, you can execute the mysqlcheck command manually, and then upgrade your system tables as described in Section 5.5.1, “mysql_fix_privilege_tables — Upgrade MySQL System Tables”.

For details about what is checked, see the description of the FOR UPGRADE option of the CHECK TABLE statement (see Section, “CHECK TABLE Syntax”).

To use mysql_upgrade, make sure that the server is running, and then invoke it like this:

shell> mysql_upgrade [options]

mysql_upgrade reads options from the command line and fromm the [mysqld] and [mysql_upgrade] groups in option files. It supports the following options:

  • --basedir=path

    The path to the MySQL installation directory.

  • --datadir=path

    The path to the data directory.

  • --force

    Force execution of mysqlcheck even if mysql_upgrade has already been executed for the current version of MySQL. (In other words, this option causes the file to be ignored.)

  • --user=user_name, -u user_name

    The MySQL username to use when connecting to the server. The default username is root.

  • --verbose

    Verbose mode. Print more information about what the program does.

Other options are passed to mysqlcheck and to mysql_fix_privilege_tables. For example, it might be necessary to specify the --password[=password] option.

mysql_upgrade was added in MySQL 5.1.7. It supersedes the older mysql_fix_privilege_tables script.

  Published under the terms of the GNU General Public License Design by Interspire