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
WHEREa.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
查询死锁
select *
from master..SysProcesses
where db_Name(dbID) = '数据库名'
and spId@@SpId
and dbID0
and blocked >0;
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