SQL2005的维护计划无法删除的解决方法

use msdb

select from sysmaintplan_plans
select from sysmaintplan_log
select from sysmaintplan_subplans

delete from sysmaintplan_log where plan_id = ' ‘
delete from sysmaintplan_subplans where subplan_id = ' '
delete from sysmaintplan_plans where id = ' '