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sql server阻塞查询语句

sql server的阻塞查询，主要来自sysprocesses。通常我们在处理时需要加入其它相关的视图或表如dm_exec_connections，dm_exec_sql_text。通过几个语句的查询，可以找到阻塞的语句。
查询阻塞
语句一
select bl.spid blocking_session,bl.blocked blocked_session,st.text blockedtext from (SELECT   spid ,blocked
   FROM (SELECT * FROM sys.sysprocesses WHERE   blocked>0 ) a
   WHERE not exists(SELECT *
                    FROM (SELECT *
                          FROM sys.sysprocesses
                          WHERE   blocked>0 ) b
                    WHERE a.blocked=spid)
   union SELECT spid,blocked
         FROM sys.sysprocesses
         WHERE   blocked>0) bl,(SELECT t.text ,c.session_id
         FROM sys.dm_exec_connections c
         CROSS APPLY sys.dm_exec_sql_text (c.most_recent_sql_handle) t) st
where bl.blocked = st.session_id

语句二
SELECT a.blocking_session_id, a.wait_duration_ms, a.session_id,b.text
FROM sys.dm_os_waiting_tasks a,
(SELECT t.text ,c.session_id
FROM sys.dm_exec_connections c
CROSS APPLY sys.dm_exec_sql_text (c.most_recent_sql_handle) t) b
WHERE a.session_id = b.session_id and a.blocking_session_id IS NOT NULL

语句三，包含阻塞与被阻塞的sql脚本

select bl.spid blocking_session,bl.blocked blocked_session,st.text blockedtext,sb.text blockingtext
from
(SELECT   spid ,blocked
   FROM (SELECT * FROM sys.sysprocesses WHERE   blocked>0 ) a
   WHERE not exists(SELECT *
                    FROM (SELECT *
                          FROM sys.sysprocesses
                          WHERE   blocked>0 ) b
                    WHERE a.blocked=spid)
   union
SELECT spid,blocked
         FROM sys.sysprocesses
         WHERE   blocked>0) bl,
(SELECT t.text ,c.session_id
         FROM sys.dm_exec_connections c
         CROSS APPLY sys.dm_exec_sql_text (c.most_recent_sql_handle) t) st,
(SELECT t.text ,c.session_id
         FROM sys.dm_exec_connections c
         CROSS APPLY sys.dm_exec_sql_text (c.most_recent_sql_handle) t) sb
where bl.blocked = st.session_id and bl.spid = sb.session_id