Discussion

Error 1112 can occur if one downgrades from a version of MySQL that supports a given feature to a version that did not have support for the given feature. This can also happen if one develops an application containing a feature available in a new version of MySQL and then attempt to use the application on a server containing an older version of MySQL. Typically, this error is issued by a version of MySQL that has been released after another version of the server has acquired new functionality. For example, functionality might be added to a maintenance release of MySQL 4.1 to display this error after new features are added to MySQL 5.0 that are unavailable in MySQL 4.1. As a result, keep in mind that using advanced features of a new version may limit your ability to downgrade directly to an earlier version of the MySQL.