Warum kann dieses mysql-Ereignis nicht ausgeführt werden?

Question

mysql> show create event online_event; 
+--------------+-----------------------------------------+-----------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+--------------------+ 
| Event  | sql_mode        | time_zone | Create Event                                              | character_set_client | collation_connection | Database Collation | 
+--------------+-----------------------------------------+-----------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+--------------------+ 
| online_event | STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER | SYSTEM | CREATE EVENT `online_event` ON SCHEDULE EVERY 1 SECOND STARTS '2009-06-03 06:54:16' ON COMPLETION NOT PRESERVE ENABLE DO DELETE FROM online where webserver_id is null and jabber_server_id is null | utf8     | utf8_general_ci  | utf8_general_ci | 
+--------------+-----------------------------------------+-----------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+--------------------+ 
1 row in set (0.00 sec) 

mysql> 

Es ist auf diese Weise erstellt:

CREATE EVENT online_event 
    ON SCHEDULE EVERY 1 SECOND 
    DO 
     DELETE FROM online where webserver_id is null and jabber_server_id is null; 

und nach einer recht Zeit, fand ich:

mysql> select *from online; 
+----+------------+---------------------+--------------+------------------+ 
| id | account_id | since    | webserver_id | jabber_server_id | 
+----+------------+---------------------+--------------+------------------+ 
| 1 |   30 | 2009-06-03 06:24:38 |   NULL |    NULL | 
+----+------------+---------------------+--------------+------------------+ 
1 row in set (0.00 sec) 

So finde ich, dass das Ereignis nicht überhaupt ausgeführt wird.

Answer 1

Wird der Ereignisplaner ausgeführt? Überprüfen Sie mit SHOW PROCESSLIST.

Wenn Sie keinen Prozess "Daemon" vom Benutzer "event_scheduler" haben, dann wird es nicht ausgeführt.

die so Event-Scheduler starten:

SET GLOBAL event_scheduler = ON; 

Siehe auch http://dev.mysql.com/doc/refman/5.1/en/events-configuration.html