Upgrading MariaDB

As a general rule, to upgrade from one release series to another, go to the next series rather than skipping a series. To upgrade from a release series previous to MariaDB 5.5, upgrade to each successive release series in turn until you have reached MariaDB 5.5, and then proceed with the upgrade to MariaDB 5.6. For example, if you currently are running MariaDB 5.1 and wish to upgrade to a newer series, upgrade to MariaDB 5.5 first before upgrading to 5.6, and so forth. For information on upgrading to MariaDB 5.5, see the MySQL 5.5 Reference Manual.

To upgrade to MariaDB 5.6, use the items in the following checklist as a guide:

• Before any upgrade, back up your databases, including the MariaDB database that contains the grant tables. See , "Database Backup Methods".
• Read all the notes in , "Upgrading from MariaDB 5.5 to 5.6". These notes enable you to identify upgrade issues that apply to your current MariaDB installation. Some incompatibilities discussed in that section require your attention before upgrading. Others require some action after upgrading.
• Read Appendix D, MySQL Change History as well, which provides information about features that are new in MariaDB 5.6 or differ from those found in earlier MariaDB releases.
• After upgrading to a new version of MySQL, run mysql_upgrade (see , "mysql_upgrade - Check Tables for MariaDB 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 MariaDB introduce changes to the structure of the grant tables to add new privileges or features.)

  mysql_upgrade does not upgrade the contents of the help tables. For upgrade instructions, see , "Server-Side Help".

• If you run MariaDB Server on Windows, see , "Upgrading MariaDB on Windows".
• If you use replication, see , "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.
• If you have created a user-defined function (UDF) with a given name and upgrade MariaDB to a version that implements a new built-in function with the same name, the UDF becomes inaccessible. To correct this, use DROP FUNCTION to drop the UDF, and then use CREATE FUNCTION to re-create the UDF with a different nonconflicting name. The same is true if the new version of MariaDB implements a built-in function with the same name as an existing stored function. See , "Function Name Parsing and Resolution", for the rules describing how the server interprets references to different kinds of functions.

You can always move the MariaDB 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 MariaDB 5.5 and want to upgrade to 5.6, rename your current server from mysqld to mysqld-5.5. 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 compiled 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, check the date for your mysql.h file and libmysqlclient.a library to verify that they are from the new MariaDB distribution. If not, recompile your programs with the new headers and libraries. Recompilation might also be necessary for programs compiled against the shared client library if the library major version number has changed (for example from libmysqlclient.so.15 to libmysqlclient.so.16.

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 MariaDB 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 MariaDB instance that contains a full copy of the MariaDB 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 MariaDB interfaces as well, such as PHP MariaDB extensions and the Python MySQLdb module.

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