当某个数据库文件空间用尽，做自动增长的时候，同一时间点只能有一个用户人员可以做文件自动增长动作，其他任务必须等待，此时会出现Latch资源的等待。使用sp_helpdb查看业务数据库时发现：该数据库设置不合理，数据文件每次增长2M，日志文件每次增长10%，且分别设置了最大限制。修改为每次增长200M，不限制大小，系统恢复正常，问题解决。

SqlServer阻塞时的等待类型如下：

顺便整理一下查看阻塞、会话状态及等待类型的SQL脚本：

-- 查看SQL阻塞信息

with tmp as (

    select * from master..sysprocesses t where t.blocked != 0

    union all

    select b.* from master..sysprocesses b

        join tmp t on b.spid = t.blocked

)

select t.spid, t.blocked, t.status, t.waittype, t.lastwaittype, t.waitresource, t.waittime

    , DB_NAME(t.dbid) DbName, t.login_time, t.loginame, t.program_name, dc.text

from (select spid from tmp group by spid) s

    join master..sysprocesses t on s.spid = t.spid

    cross apply master.sys.dm_exec_sql_text(t.sql_handle) dc

-- 查看所有会话的状态、等待类型及当前正在执行SQL脚本
select t.spid, t.kpid, t.blocked, t.status, t.waittype, t.lastwaittype, t.waitresource, t.waittime

    , DB_NAME(t.dbid) DbName, t.login_time, t.last_batch, t.loginame, t.program_name, t.hostname, t.hostprocess
    , t.cmd, t.stmt_start, t.stmt_end, t.request_id, dc.text

from    master.sys.sysprocesses t

    outer apply master.sys.dm_exec_sql_text(t.sql_handle) dc
where    t.spid >= 50

补充，昨天又有项目发生类似问题，将SqlServer的errorlog也贴出来，问题现象就更具体了。

07/01/2015 16:44:56,spid55,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x000000000097DB88 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000007C2E08. Not continuing to wait.

07/01/2015 16:44:47,spid51,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D2FC3AC0<c/> page 1:117692<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594070827008<c/> task 0x000000000053F708 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000007C34C8. Not continuing to wait.

07/01/2015 16:44:41,spid77,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D2FC3AC0<c/> page 1:117692<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594070827008<c/> task 0x00000000F380DB88 : 0<c/> waittime 300<c/> flags 0x1a<c/> owning task 0x00000000007C34C8. Not continuing to wait.

07/01/2015 16:44:32,spid60,未知,Timeout occurred while waiting for latch: class 'LOG_MANAGER'<c/> id 000000000C980AE0<c/> type 4<c/> Task 0x00000000007C34C8 : 0<c/> waittime 300<c/> flags 0x1a<c/> owning task 0x00000000007C2E08. Continuing to wait.

07/01/2015 16:43:56,spid54,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000BD674E08 : 0<c/> waittime 300<c/> flags 0x1a<c/> owning task 0x00000000007C2E08. Not continuing to wait.

07/01/2015 14:46:39,spid62,未知,Autogrow of file 'cwbase001_log' in database 'cwbase001' took 568576 milliseconds.  Consider using ALTER DATABASE to set a smaller FILEGROWTH for this file.

07/01/2015 14:45:54,spid66,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000007A9DC8 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000007C2E08. Not continuing to wait.

07/01/2015 14:45:46,spid70,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000CAFE1880<c/> page 1:113858<c/> stat 0xc0010b<c/> database id: 10<c/> allocation unit Id: 72057594070827008<c/> task 0x00000000BD674748 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000BD674508. Not continuing to wait.

07/01/2015 14:45:28,spid59,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000CAFE1880<c/> page 1:113858<c/> stat 0xc0010b<c/> database id: 10<c/> allocation unit Id: 72057594070827008<c/> task 0x00000000007C2BC8 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000BD674508. Not continuing to wait.

07/01/2015 14:45:24,spid67,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000CAFE1880<c/> page 1:113858<c/> stat 0xc0010b<c/> database id: 10<c/> allocation unit Id: 72057594070827008<c/> task 0x00000000F380CBC8 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000BD674508. Not continuing to wait.

07/01/2015 14:44:54,spid65,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x000000000053EE08 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000007C2E08. Not continuing to wait.

07/01/2015 14:44:40,spid64,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000CAFE1880<c/> page 1:113858<c/> stat 0xc0010b<c/> database id: 10<c/> allocation unit Id: 72057594070827008<c/> task 0x00000000BD674E08 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000BD674508. Not continuing to wait.

07/01/2015 14:43:54,spid63,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x000000000053F708 : 0<c/> waittime 300<c/> flags 0x1a<c/> owning task 0x00000000007C2E08. Not continuing to wait.

07/01/2015 14:43:50,spid60,未知,Timeout occurred while waiting for latch: class 'LOG_MANAGER'<c/> id 000000000C980AE0<c/> type 4<c/> Task 0x00000000007A9288 : 0<c/> waittime 300<c/> flags 0x1a<c/> owning task 0x00000000BD674508. Continuing to wait.

07/01/2015 14:43:13,spid54,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000CAFE1880<c/> page 1:113858<c/> stat 0xc0010b<c/> database id: 10<c/> allocation unit Id: 72057594070827008<c/> task 0x00000000B2F4C988 : 0<c/> waittime 300<c/> flags 0x1a<c/> owning task 0x00000000BD674508. Not continuing to wait.

07/01/2015 14:42:54,spid53,未知,Timeout occurred while waiting for latch: class 'LOG_MANAGER'<c/> id 000000000C980AE0<c/> type 4<c/> Task 0x00000000007C2E08 : 0<c/> waittime 300<c/> flags 0x1a<c/> owning task 0x00000000BD674508. Continuing to wait.

07/01/2015 13:01:53,spid18s,未知,Autogrow of file 'cwbase001_log' in database 'cwbase001' took 961310 milliseconds.  Consider using ALTER DATABASE to set a smaller FILEGROWTH for this file.

07/01/2015 13:01:53,spid60,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000B2F4CBC8 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid90,未知,A time-out occurred while waiting for buffer latch -- type 4<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000F535C2C8 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid113,未知,A time-out occurred while waiting for buffer latch -- type 4<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000F380D048 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid111,未知,A time-out occurred while waiting for buffer latch -- type 4<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000B2F4D4C8 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid114,未知,A time-out occurred while waiting for buffer latch -- type 4<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000F535CE08 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid125,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000F380DB88 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid120,未知,A time-out occurred while waiting for buffer latch -- type 4<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000F535C748 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid55,未知,A time-out occurred while waiting for buffer latch -- type 4<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000F380CBC8 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid117,未知,A time-out occurred while waiting for buffer latch -- type 4<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000007A9288 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid59,未知,A time-out occurred while waiting for buffer latch -- type 4<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000BD674E08 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid109,未知,A time-out occurred while waiting for buffer latch -- type 4<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x000000000053EE08 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid66,未知,A time-out occurred while waiting for buffer latch -- type 4<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000007C2E08 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid106,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x000000000053F708 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 13:01:50,spid57,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000BD675DC8 : 0<c/> waittime 300<c/> flags 0x1a<c/> owning task 0x00000000B2F4C2C8. Not continuing to wait.

07/01/2015 12:56:50,spid109,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x000000000053EE08 : 0<c/> waittime 300<c/> flags 0x1a<c/> owning task 0x00000000F380D048. Not continuing to wait.

07/01/2015 12:51:17,spid75,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000CAFE1880<c/> page 1:113858<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594070827008<c/> task 0x000000000053FB88 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000007C3B88. Not continuing to wait.

07/01/2015 12:51:17,spid88,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000CAFE1880<c/> page 1:113858<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594070827008<c/> task 0x00000000F535D708 : 0<c/> waittime 300<c/> flags 0x1a<c/> owning task 0x00000000007C3B88. Not continuing to wait.

07/01/2015 12:45:53,spid54,未知,A time-out occurred while waiting for buffer latch -- type 2<c/> bp 00000000D9FD9540<c/> page 1:3783<c/> stat 0xc00109<c/> database id: 10<c/> allocation unit Id: 72057594043629568<c/> task 0x00000000F380D288 : 0<c/> waittime 300<c/> flags 0x3a<c/> owning task 0x00000000F380D048. Not continuing to wait.

SqlServer性能急剧下降，查看所有会话的状态及等待类型---Latch_Ex的更多相关文章

  1. SqlServer性能优化，查看CPU、内存占用大的会话及SQL语句

    1,查看CPU占用量最高的会话及SQL语句   select spid,cmd,cpu,physical_io,memusage, (select top 1 [text] from ::fn_get ...

  2. 了解 .NET 的默认 TaskScheduler 和线程池（ThreadPool）设置，避免让 Task.Run 的性能急剧降低

    .NET Framework 4.5 开始引入 Task.Run,它可以很方便的帮助我们使用 async / await 语法,同时还使用线程池来帮助我们管理线程.以至于我们编写异步代码可以像编写同步 ...

  3. SQLSERVER性能监控级别步骤

    SQLSERVER性能监控级别步骤 下面先用一幅图描述一下有哪些步骤和顺序 1.识别瓶颈 识别瓶颈的原因包括多个方面,例如,资源不足,需要添加或升级硬件: 工作负荷在同类资源之间分布不均匀,例如,一个 ...

  4. SQLServer性能优化之---数据库级日记监控

    上节回顾:https://www.cnblogs.com/dotnetcrazy/p/11029323.html 4.6.6.SQLServer监控 脚本示意:https://github.com/l ...

  5. 01.SQLServer性能优化之----强大的文件组----分盘存储

    汇总篇:http://www.cnblogs.com/dunitian/p/4822808.html#tsql 文章内容皆自己的理解,如有不足之处欢迎指正~谢谢 前天有学弟问逆天:“逆天,有没有一种方 ...

  6. 知方可补不足~sqlserver中使用sp_who查看sql的进程

    回到目录 在SQLSERVER中每个会话,即每个查询分析器窗口都会产生一个SQL进程,对于那些持续时间短的进程,它们转瞬即失,而对于持续时间比较长的,我们需要希望查看它的运行状态,就可以借助SQL提供 ...

  7. SQLServer性能调优3之索引（Index）的维护

    前言 前一篇的文章介绍了通过建立索引来提高数据库的查询性能,这其实只是个开始.后续如果缺少适当的维护,你先前建立的索引甚至会成为拖累,成为数据库性能的下降的帮凶. 查找碎片 消除碎片可能是索引维护最常 ...

  8. 03.SQLServer性能优化之---存储优化系列

    汇总篇:http://www.cnblogs.com/dunitian/p/4822808.html#tsql 概  述:http://www.cnblogs.com/dunitian/p/60413 ...

  9. 02.SQLServer性能优化之---牛逼的OSQL----大数据导入

    汇总篇:http://www.cnblogs.com/dunitian/p/4822808.html#tsql 上一篇:01.SQLServer性能优化之----强大的文件组----分盘存储 http ...

随机推荐

  1. 20145210 《Java程序设计》第一周学习总结

    教材学习内容总结 第一章: 1.Java三大平台,JavaSE的四个组成部分 Java根据应用领域的不同,区分为Java SE.Java EE.Java ME三大平台. 各应用平台的基础:Java S ...

  2. 第一次sprint团队贡献分改

    201306114322 邵家文 50分 201306114319 陈俊金 10分 201306114320 李新    10分 201306114324 朱浩龙 10分

  3. iptables导致数据包过多时连接失败

    前几天做服务器压力测试,本地10个线程不停的去向服务器建立连接,然后请求数据,然后连接再关闭,程序每运行几万次之后就会发现客户端程序没办法connect服务器,connect超时. 一开始怀疑是自己服 ...

  4. Day08_面向对象第三天

      1.代码块(掌握) 1.概述     由{}扩起来的代码称之为代码块,类或者方法也可认为是代码块,但是一般不这么说,我们平时所说的代码块指的是孤零零的{} 2.代码块作用     局部代码块作用  ...

  5. Java自带的keytool命令

    使用Java自带的keytool命令,在命令行生成. 1.生成服务器端私钥kserver.keystore文件 keytool -genkey -alias serverkey -validity 1 ...

  6. SAP采购订单屏幕增强

    转自<http://blog.csdn.net/heng0757/article/details/8073875> 为采购订单增加一个页标签,在其中放入客户自定义字段, 1. CMOD 增 ...

  7. 225. Implement Stack using Queues

    代码如下: class MyStack { // Push element x onto stack. Queue<Integer> queue=new ArrayDeque<> ...

  8. TensorFlow简单介绍和在centos上的安装

    ##tensorflow简单介绍: TensorFlow™ is an open source software library for numerical computation using dat ...

  9. 发布常见问题（C#）

    1.Sys.WebForms.PageRequestManagerServerErrorException: 在服务器上处理请求时出现未知错误.服务器返回的状态码为: 500 可能的原因: asp.n ...

  10. leetcode 112 Path Sum ----- java

    Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all ...