Syntax:
SHOW PLUGINS

SHOW PLUGINS displays information about known plugins.

mysql> SHOW PLUGINS;
+------------+--------+----------------+---------+
| Name       | Status | Type           | Library |
+------------+--------+----------------+---------+
| MEMORY     | ACTIVE | STORAGE ENGINE | NULL    |
| MyISAM     | ACTIVE | STORAGE ENGINE | NULL    |
| InnoDB     | ACTIVE | STORAGE ENGINE | NULL    |
| ARCHIVE    | ACTIVE | STORAGE ENGINE | NULL    |
| CSV        | ACTIVE | STORAGE ENGINE | NULL    |
| BLACKHOLE  | ACTIVE | STORAGE ENGINE | NULL    |
| FEDERATED  | ACTIVE | STORAGE ENGINE | NULL    |
| MRG_MYISAM | ACTIVE | STORAGE ENGINE | NULL    |
+------------+--------+----------------+---------+

URL: http://dev.mysql.com/doc/refman/5.1/en/show-plugins.html

