Syntax:
DROP SERVER [ IF EXISTS ] server_name

Drops the server definition for the server named server_name. The
corresponding row within the mysql.servers table will be deleted. This
statement requires the SUPER privilege.

Dropping a server for a table does not affect any FEDERATED tables that
used this connection information when they were created. See [HELP
CREATE SERVER].

URL: http://dev.mysql.com/doc/refman/5.5/en/drop-server.html

