sys.dm_exec_query_plan以 XML格式返回计划句柄指定的批查询的显示计划，下面的语句就是通过查询XML获得并行计划信息。
SELECT TOP 10
p.*,
q.*,
qs.*,
cp.plan_handle
FROM
sys.dm_exec_cached_planscp
CROSS apply
sys.dm_exec_query_plan(cp.plan_handle) p
CROSS apply
sys.dm_exec_sql_text(cp.plan_handle)AS q
JOIN sys.dm_exec_query_stats qs
ON qs.plan_handle= cp.plan_handle
WHERE
cp.cacheobjtype='Compiled Plan'AND
p.query_plan.value('declare namespacep="http://schemas.microsoft.com/sqlserver/2004/07/showplan";
max(//p:RelOp/@Parallel)','float')
> 0
OPTION (MAXDOP 1)
下面的可以用来查正在执行的语句：
---requests arerunning in parallel
select
r.session_id,
r.request_id,
max(isnull(exec_context_id, 0))
asnumber_of_workers,
r.sql_handle,
r.statement_start_offset,
r.statement_end_offset,
r.plan_handle
from
sys.dm_exec_requests r
join sys.dm_os_tasks t
on r.session_id
= t.session_id
join sys.dm_exec_sessions s
onr.session_id
=s.session_id
where
s.is_user_process= 0x1
group by
r.session_id, r.request_id,
r.sql_handle, r.plan_handle,
r.statement_start_offset, r.statement_end_offset
having max(isnull(exec_context_id, 0))
> 0