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2.18.1.1 Upgrading from MySQL 5.0 to 5.0.10 or Higher »
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2.18.1. Upgrading MySQL

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2.18.1.1. Upgrading from MySQL 5.0 to 5.0.10 or Higher
2.18.1.2. Upgrading from MySQL 4.1 to 5.0

As a general rule, to upgrade from one release series to another, you should go to the next series rather than skipping a series. To upgrade from a release series previous to MySQL 4.1, upgrade to each successive release series in turn until you have reached MySQL 4.1, and then proceed with the upgrade to MySQL 5.0. For example, if you currently are running MySQL 4.0 and wish to upgrade to a newer series, upgrade to MySQL 4.1 first before upgrading to 5.0, and so forth. For information on upgrading to MySQL 4.1 or earlier releases, see the MySQL 3.23, 4.0, 4.1 Reference Manual.

To upgrade from MySQL 4.1 to 5.0, use the items in the following checklist as a guide:

  • Before any upgrade, back up your databases, including the mysql database that contains the grant tables. See Section 6.2, “Database Backup Methods”.

  • Read all the notes in Section 2.18.1.2, “Upgrading from MySQL 4.1 to 5.0”. These notes enable you to identify upgrade issues that apply to your current MySQL installation. Some incompatibilities discussed in that section require your attention before upgrading. Others should be dealt with after upgrading.

  • Read Appendix C, MySQL Change History as well, which provides information about features that are new in MySQL 5.0 or differ from those found in MySQL 4.1.

  • After upgrading to a new version of MySQL, run mysql_upgrade (see Section 4.4.9, “mysql_upgrade — Check Tables for MySQL Upgrade”). This program checks your tables, and attempts to repair them if necessary. It also updates your grant tables to make sure that they have the current structure so that you can take advantage of any new capabilities. (Some releases of MySQL introduce changes to the structure of the grant tables to add new privileges or features.)

  • If you run MySQL Server on Windows, see Section 2.9.14, “Upgrading MySQL on Windows”.

  • If you use replication, see Section 16.4.3, “Upgrading a Replication Setup”, for information on upgrading your replication setup.

  • If you upgrade an installation originally produced by installing multiple RPM packages, it is best to upgrade all the packages, not just some. For example, if you previously installed the server and client RPMs, do not upgrade just the server RPM.

  • MySQL 5.0.27 is the last version in MySQL 5.0 for which MySQL-Max binary distributions are provided, except for RPM distributions. For RPMs, MySQL 5.0.37 is the last release. After these versions, the features previously included in the mysqld-max server are included in mysqld.

    If you previously installed a MySQL-Max distribution that includes a server named mysqld-max, and then upgrade later to a non-Max version of MySQL, mysqld_safe still attempts to run the old mysqld-max server. If you perform such an upgrade, you should remove the old mysqld-max server manually to ensure that mysqld_safe runs the new mysqld server.

You can always move the MySQL format files and data files between different versions on systems with the same architecture as long as you stay within versions for the same release series of MySQL.

If you are cautious about using new versions, you can always rename your old mysqld before installing a newer one. For example, if you are using a version of MySQL 4.1 and want to upgrade to 5.0, rename your current server from mysqld to mysqld-4.1. If your new mysqld then does something unexpected, you can simply shut it down and restart with your old mysqld.

If, after an upgrade, you experience problems with recompiled client programs, such as Commands out of sync or unexpected core dumps, you probably have used old header or library files when compiling your programs. In this case, you should check the date for your mysql.h file and libmysqlclient.a library to verify that they are from the new MySQL distribution. If not, recompile your programs with the new headers and libraries.

If problems occur, such as that the new mysqld server does not start or that you cannot connect without a password, verify that you do not have an old my.cnf file from your previous installation. You can check this with the --print-defaults option (for example, mysqld --print-defaults). If this command displays anything other than the program name, you have an active my.cnf file that affects server or client operation.

If your MySQL installation contains a large amount of data that might take a long time to convert after an in-place upgrade, you might find it useful to create a “dummy” database instance for assessing what conversions might be needed and the work involved to perform them. Make a copy of your MySQL instance that contains a full copy of the mysql database, plus all other databases without data. Run your upgrade procedure on this dummy instance to see what actions might be needed so that you can better evaluate the work involved when performing actual data conversion on your original database instance.

It is a good idea to rebuild and reinstall the Perl DBD::mysql module whenever you install a new release of MySQL. The same applies to other MySQL interfaces as well, such as PHP mysql extensions and the Python MySQLdb module.