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Advantages of Migrating to MySQL 5

All new databases created in the 1&1 Control Panel will use MySQL 5. It is therefore recommended to convert all of your current MySQL 4 databases (if any) to use MySQL 5 proactively so that complications do not arise in the future if ever forced to create a new database.

Please note:
The field type varchar binary is no longer available in MySQL 5.

MySQL 5 comes with a number of new features that are especially relevant for commercially used systems. Moreover, the performance has been improved.

Most notable improvements with MySQL 5