Sometimes our support team receive a helpdesk request concerning this error message shown in Schema Comparison of DBTYP.NET 2009 Studio.
The usual problem with such a customers is that almost all of them make recent upgrade of MySQL server. While some releases of MySQL introduce changes in the structure of the system tables in mysql database to add new privileges and support new features, it is necessary to update the system tables as well.
This can be achieved by running mysql_fix_privilege_tables script in MySQL prior to version 5.1.7 or mysql_upgrade in version 5.1.7 or above.
For more details check following links:
- http://dev.mysql.com/doc/refman/5.1/en/mysql-fix-privilege-tables.html
- http://dev.mysql.com/doc/refman/5.1/en/mysql-upgrade.html
