SQL Server 日常维护--查询当前正在执行的语句、死锁、堵塞

查询当前正在执行的语句：

 SELECT
 der.[session_id],der.[blocking_session_id],
 sp.lastwaittype,sp.hostname,sp.program_name,sp.loginame,
 der.[start_time] AS '开始时间',
 der.[status] AS '状态',
 dest.[text] AS 'sql语句',
 DB_NAME(der.[database_id]) AS '数据库名',
 der.[wait_type] AS '等待资源类型',
 der.[wait_time] AS '等待时间',
 der.[wait_resource] AS '等待的资源',
 der.[logical_reads] AS '逻辑读次数'
 FROM sys.[dm_exec_requests] AS der
 INNER JOIN master.dbo.sysprocesses AS sp ON der.session_id=sp.spid
 CROSS APPLY  sys.[dm_exec_sql_text](der.[sql_handle]) AS dest
 --WHERE [session_id]>50 AND session_id<>@@SPID
 ORDER BY der.[session_id]
 GO  

是否堵塞：

 SELECT spid,blocked,waittime,waittype,waitresource,p.dbid,cpu,physical_io,memusage,open_tran
 ,status,login_time,last_batch,hostname,program_name,hostprocess,loginame,cmd,text
 FROM master.dbo.sysprocesses p CROSS APPLY sys.dm_exec_sql_text(p.sql_handle) s
 WHERE blocked > 0 OR spid IN(SELECT blocked FROM master.dbo.sysprocesses WHERE blocked > 0)
 go

是否有未提交事物：

 select spid,blocked,waittime,waittype,waitresource,p.dbid,cpu,physical_io,memusage,open_tran
 ,status,login_time,last_batch,hostname,program_name,hostprocess,loginame,cmd,text
 from master.dbo.sysprocesses p cross apply sys.dm_exec_sql_text(p.sql_handle) s
 where open_tran <> 0
 go 

死锁：

 --drop table #deadlock

 CREATE TABLE #deadlock(LogDate DATETIME,ProcessInfo VARCHAR(20),Text VARCHAR(2000))
 go
 INSERT INTO #deadlock EXEC xp_readerrorlog 0,1,'deadlock victim',NULL,'2016-07-20 14:00:00','2016-07-30','DESC'
 go  

死锁加nolock优化