When you issue an SQL statement that contains a database link, you must use the fully qualified database link name stored in the data dictionary.
When OceanBase Database connects to a remote database, it uses the database connection string to access the remote database. After the connection is established using the database string, username, and password, OceanBase Database uses the rules defined in the referenced schema objects to access the specified object on the remote database. However, when accessing a table object in a different schema, you must explicitly specify the database name. For example: test.t1@my_link.