如何检查SQL Server阻塞

--查询应用程序的等待
SELECT TOP 10
wait_type,waiting_tasks_count AS tasks,
wait_time_ms,max_wait_time_ms AS max_wait,
signal_wait_time_ms AS signal
from sys.dm_os_wait_stats
ORDER BY wait_time_ms DESC
--查询在任一时刻所有授权给当前执行事务或当前执行事务等待的锁
SELECT
request_session_id AS spid,resource_type AS rt,
resource_database_id AS rdb,
(CASE resource_type
 WHEN 'OBJECT' THEN OBJECT_NAME(resource_associated_entity_id)
 WHEN 'DATABASE' THEN ' '
 ELSE (SELECT OBJECT_NAME(object_id)
        from sys.partitions WHERE hobt_id=resource_associated_entity_id)
 END)AS objname,
 resource_description AS rd,
 request_mode AS rm,
 request_status AS rs
from sys.dm_tran_locks
--阻塞的生存期和正被阻塞事务执行的SQL语句
SELECT
t1.resource_type,
'databse'=DB_NAME(resource_database_id),
'blk object'=resource_associated_entity_id,
request_mode,request_session_id,wait_duration_ms,
(SELECT SUBSTRING(text,statement_start_offset/2+1,
        (CASE WHEN statement_end_offset=-1
        THEN LEN(CONVERT(NVARCHAR(max),text))*2
        ELSE statement_end_offset
        END -statement_start_offset)/2)
    from sys.dm_exec_sql_text(sql_handle)
    ) AS query_text,
t1.resource_description
from sys.dm_tran_locks AS t1,
sys.dm_os_waiting_tasks t2,
sys.dm_exec_requests t3
WHERE
t1.lock_owner_address=t2.resource_address AND
t1.request_request_id=t3.request_id AND
t2.session_id=t3.session_id