如何在涉及sys表的两个数据库之间联接查询?

-- find last usage info, 
-- how far back this information goes depends on the 
-- server/database settings

select --
ss.name as SchemaName, so.name as SprocName
,so.create_date as SprocCreated, so.modify_date as SprocModified 
,so.object_id
,stat.last_user_seek,stat.last_user_scan,stat.last_user_lookup,stat.last_user_update
,stat.last_system_seek,stat.last_system_scan,stat.last_system_lookup, stat.last_system_update
from sys.objects so

inner join sys.schemas ss on so.schema_id=ss.schema_id

left join sys.dm_db_index_usage_stats stat
on so.object_id=stat.object_id

where ss.name<>'sys' and so.type='P' 
union 
select 
ss.name as SchemaName, so.name as SprocName
,so.create_date as SprocCreated, so.modify_date as SprocModified 
,so.object_id
,stat.last_user_seek,stat.last_user_scan,stat.last_user_lookup,stat.last_user_update
,stat.last_system_seek,stat.last_system_scan,stat.last_system_lookup, stat.last_system_update
from db_dit.dbo.sys.objects so 

inner join sys.schemas ss on so.schema_id=ss.schema_id

left join sys.dm_db_index_usage_stats stat
on so.object_id=stat.object_id

where ss.name<>'sys' and so.type='P'
order by case when stat.object_id is null then 0 else 1 end,ss.name,so.name

我试图验证dev的存储过程更改是否被推到了一个简单的查询中,但我似乎无法在另一个数据库上查询sys表 Invalid object name 'db_dit.dbo.sys.objects'.