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MySQL 3.23, 4.0, 4.1 Reference Manual :: 15 MySQL Cluster :: 15.5 Upgrading and Downgrading MySQL Cluster :: 15.5.2 MySQL Cluster 4.1 Upgrade and Downgrade Compatibility
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15.5.2. MySQL Cluster 4.1 Upgrade and Downgrade Compatibility

This section provides information about MySQL Cluster software and table file compatibility between MySQL 4.1 releases with regard to performing upgrades and downgrades.

Important

Only compatibility between MySQL versions with regard to NDBCLUSTER is taken into account in this section, and there are likely other issues to be considered. As with any other MySQL software upgrade or downgrade, you are strongly encouraged to review the relevant portions of the MySQL Manual for the MySQL versions from which and to which you intend to migrate, before attempting an upgrade or downgrade of the MySQL Cluster software. See Section 2.11, “Upgrading MySQL”.

The following table shows Cluster upgrade and downgrade compatibility between different releases of MySQL 4.1:

MySQL Cluster upgrade/downgrade compatibility, MySQL 4.1

Notes. 

  • You cannot perform an online upgrade directly from 4.1.8 to 4.1.10 (or newer); you must first upgrade from 4.1.8 to 4.1.9, then upgrade to 4.1.10. Similarly, you cannot downgrade directly from 4.1.10 (or newer) to 4.1.8; you must first downgrade from 4.1.10 to 4.1.9, then downgrade from 4.1.9 to 4.1.8.

  • Online upgrades from MySQL Cluster versions previous to 4.1.8 are not supported; when upgrading from these, you must dump all NDBCLUSTER tables using mysqldump, install the new version of the software, and then reload the tables from the dump.

  • If you wish to upgrade a MySQL Cluster to 4.1.15, you must upgrade to 4.1.14 first, and you must upgrade to 4.1.15 before upgrading to 4.1.16 or newer.

  • Cluster downgrades from 4.1.15 to 4.1.14 (or earlier versions) are not supported.

  • Direct upgrades or downgrades between MySQL Cluster 4.1 and 5.0 are not supported; you must dump all NDBCLUSTER tables using mysqldump, install the new version of the software, and then reload the tables from the dump.