1.查看"維護計劃"對象的ID 代碼如下：
use msdb
select * from sysmaintplan_plans
select * from sysmaintplan_log
select * from sysmaintplan_subplans
2.根據ID號刪除相應的"維護計劃" 代碼如下：
delete from sysmaintplan_log where plan_id = ' ‘
delete from sysmaintplan_subplans where subplan_id = ' '
delete from sysmaintplan_plans where id = ' '
