SQL server 大量数据导入和系统运行慢的问题

1.日常排查语句

 1 --当前正在执行的语句  
 2 SELECT  
 3 der.[session_id],der.[blocking_session_id],  
 4 sp.lastwaittype,sp.hostname,sp.program_name,sp.loginame,  
 5 der.[start_time] AS '开始时间',  
 6 der.[status] AS '状态',  
 7 dest.[text] AS 'sql语句',  
 8 DB_NAME(der.[database_id]) AS '数据库名',  
 9 der.[wait_type] AS '等待资源类型',  
10 der.[wait_time] AS '等待时间',  
11 der.[wait_resource] AS '等待的资源',  
12 der.[logical_reads] AS '逻辑读次数'  
13 FROM sys.[dm_exec_requests] AS der  
14 INNER JOIN master.dbo.sysprocesses AS sp ON der.session_id=sp.spid  
15 CROSS APPLY  sys.[dm_exec_sql_text](der.[sql_handle]) AS dest  
16 WHERE [session_id]>50 AND session_id<>@@SPID  
17 ORDER BY der.[session_id]  
18 GO  
19   
20 --是否堵塞  
21 SELECT spid,blocked,waittime,waittype,waitresource,p.dbid,cpu,physical_io,memusage,open_tran  
22 ,status,login_time,last_batch,hostname,program_name,hostprocess,loginame,cmd,text  
23 FROM master.dbo.sysprocesses p CROSS APPLY sys.dm_exec_sql_text(p.sql_handle) s  
24 WHERE blocked > 0 OR spid IN(SELECT blocked FROM master.dbo.sysprocesses WHERE blocked > 0)  
25 go   
26   
27 --是否有未提交事物  
28 select spid,blocked,waittime,waittype,waitresource,p.dbid,cpu,physical_io,memusage,open_tran    
29 ,status,login_time,last_batch,hostname,program_name,hostprocess,loginame,cmd,text    
30 from master.dbo.sysprocesses p cross apply sys.dm_exec_sql_text(p.sql_handle) s    
31 where open_tran <> 0    
32 go    
33   
34 --死锁 drop table #deadlock  
35 CREATE TABLE #deadlock(LogDate DATETIME,ProcessInfo VARCHAR(20),Text VARCHAR(2000))  
36 go  
37 INSERT INTO #deadlock EXEC xp_readerrorlog 0,1,'deadlock victim',NULL,'2016-07-20 14:00:00','2016-07-30','DESC'    
38 go 
select * from #deadlock

 

发现较多进程正在等待某个表资源,从中查看是什么表。

1 waitresource/等待的资源 TAB: 7:1028198713:7  
2 select OBJECT_NAME(1028198713)  

同时看看有没有发生死锁,果然有死锁!(提前开启死锁跟踪: traceon(1222,-1))

死锁资源列表如下:

 1 resource-list  
 2  objectlock lockPartition=27 objid=629577281 subresource=FULL dbid=7 objectname=MYDB.dbo.mytable id=lock1bdc37b280 mode=Sch-S associatedObjectId=629577281  
 3   owner-list  
 4    owner id=processe51d948 mode=Sch-S  
 5    owner id=processe4bf288 mode=Sch-S  
 6   waiter-list  
 7    waiter id=process2b95dcc508 mode=Sch-M requestType=wait  
 8  objectlock lockPartition=23 objid=629577281 subresource=FULL dbid=7 objectname=MYDB.dbo.mytable id=lock1bfb3d7680 mode=Sch-M associatedObjectId=629577281  
 9   owner-list  
10    owner id=process2b95dcc508 mode=Sch-M  
11   waiter-list  
12    waiter id=process5c53dc8 mode=IS requestType=wait  
13  objectlock lockPartition=19 objid=629577281 subresource=FULL dbid=7 objectname=MYDB.dbo.mytable id=lock1d20baba80 mode=Sch-M associatedObjectId=629577281  
14   owner-list  
15   waiter-list  
16    waiter id=processe4bf288 mode=Sch-S requestType=wait  
17  objectlock lockPartition=23 objid=629577281 subresource=FULL dbid=7 objectname=MYDB.dbo.mytable id=lock1bfb3d7680 mode=Sch-M associatedObjectId=629577281  
18   owner-list  
19   waiter-list  
20    waiter id=processe51d948 mode=Sch-S requestType=wait  
21  objectlock lockPartition=19 objid=629577281 subresource=FULL dbid=7 objectname=MYDB.dbo.mytable id=lock1d20baba80 mode=Sch-M associatedObjectId=629577281  
22   owner-list  
23    owner id=process2b95dcc508 mode=Sch-M  
24   waiter-list  
25    waiter id=processe480988 mode=IS requestType=wait 

可以看到,出现了架构稳定锁(Sch-S)和架构修改锁(Sch-M),但是数据库没有人修改架构啊!查看审核信息也无人修改过表对象。什么原因??!

继续使用上面的排查语句进行多次查询,发现了一条特殊的语句!

1 insert bulk [dbo].[TABLES_Writes](此处省略字段)  

果然是该语句了!大容量插入是要表级别的锁,并且也会出现架构锁。其他等待资源的进程,也是需要查询该表的,所以才出现了表级别的资源等待!而恰巧,要使用该表的是一个存储过程,也是比较复杂的,执行10秒以上,该存储过程使用的其实是一个视图,视图中包含了该表!暂时解决的话。在视图上加nolock。询问开发人员,说大容量导入操作随时发生的,因为有些数据是需要业务员操作导入的。这种方法以后还是得改,要么大容量先插入到一个中间表,再插入到当前表中。

转载于:https://www.cnblogs.com/yasuo2/p/6444666.html

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