Syntax
------

DROP SERVER [ IF EXISTS ] server_name

Description
-----------

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 or, from MariaDB 10.5.2, the FEDERATED
ADMIN privilege.

Dropping a server for a table does not affect any FederatedX, FEDERATED,
Connect or Spider tables that used this connection information when they were
created.

DROP SERVER is not written to the binary log, irrespective of the binary log
format being used. From MariaDB 10.1.13, Galera replicates the CREATE SERVER,
ALTER SERVER and DROP SERVER statements.

IF EXISTS
---------

If the IF EXISTS clause is used, MariaDB will not return an error if the
server does not exist. Unlike all other statements, DROP SERVER IF EXISTS does
not issue a note if the server does not exist. See MDEV-9400.

Examples
--------

DROP SERVER s;

IF EXISTS:

DROP SERVER s;
ERROR 1477 (HY000): The foreign server name you are trying to reference 
 does not exist. Data source error:  s

DROP SERVER IF EXISTS s;
Query OK, 0 rows affected (0.00 sec)

URL: https://mariadb.com/kb/en/drop-server/