This topic describes DROP INDEX DDL operations that are executed in a MySQL database and can be converted by the DDL synchronization component of OceanBase Migration Service (OMS), but they cannot be executed in the MySQL tenant of OceanBase Database when you migrate data from the MySQL database to the MySQL tenant of OceanBase Database.
Delete an index referenced by a foreign key
An INDEX with foreign key dependency indicates that the columns in the INDEX involve foreign key dependency or reference.
MySQL databases: not supported.
MySQL tenants of OceanBase Database: supported.