sql server 会记录IO等待时间超过15 seconds的请求,这时application会有 time out 现象,dba需要判断是workload,concurrecy 所致还是sql server配置没有最优导致?二者之间的比例各占多少? 1:判断sql server的配置是否最优化,相对容易,可以有以下项目检查: a: 通过datafile/logfile放置在不同的drive上,可以分离random io 和 sequence io 操作,可以极大的缓解读写IO,对于写IO,…

2017-11-01 09:49:44.35 spid166 SQL Server has encountered 1 occurrence(s) of cachestore flush for the 'Object Plans' cachestore (part of plan cache) due to some database maintenance or reconfigure operations. 2017-11-01 09:49:47.85 spid166 SQL Server…

Complete list of Microsoft SQL Server trace flags (585 trace flags) REMEMBER: Be extremely careful with trace flags, test in your test environment first. And consult professionals first if you are the slightest uncertain about the effects of your cha…

朋友遇到一个很棘手的问题,查看服务器日志,报以下错误: ::,spid296,未知,错误: ,严重性: ,状态: . ::,spid495,未知, The client was unable <c/> which had been reset . This error may have been caused by an earlier operation failing. Check the error logs for failed operations immediately befor…

本文出处:http://www.cnblogs.com/wy123/p/6984885.html 最近遇到一个SQL Server服务器响应极度缓慢,并且出现客户端请求报错的情况,在数据库中的errorlog中出现磁盘请求超过15s才完成的error消息.对于此类问题,到底是存储系统或者磁盘的故障,还是SQL Server 自己的问题,亦或是应用程序引发的呢?又要如何解决?本文将对引起此问题的某一方面的因素进行简单的分析,但是无法涵盖所有潜在的可能性,因此遇到类似问题还要做具体的分析. SQL…

非常全面的SQL Server巡检脚本来自sqlskills团队的Glenn Berry 大牛 Glenn Berry 大牛会对这个脚本持续更新 -- SQL Server 2012 Diagnostic Information Queries -- Glenn Berry -- April 2015 -- Last Modified: April 27, 2015 -- http://sqlserverperformance.wordpress.com/ -- http://sqlskills…

Query #13 SQL Server Error Log(FC) -- Shows you where the SQL Server failover cluster diagnostic log is located and how it is configured SELECT is_enabled, [path], max_size, max_files FROM sys.dm_os_server_diagnostics_log_configurations WITH (NOLOCK)…

非常全面的SQL Server巡检脚本来自sqlskills团队的Glenn Berry Glenn Berry 曾承诺对这个脚本持续更新 -- SQL Server 2012 Diagnostic Information Queries -- Glenn Berry -- April 2015 -- Last Modified: April 27, 2015 -- http://sqlserverperformance.wordpress.com/ -- http://sqlskills.co…

我的SQL 2014的虚拟机在迁移的时候, 存放TempDB的LUN被删掉了. 在虚拟机的操作系统启动了之后, SQL Server Instance却启动不起来了. 检查Event Log, 报错. 于是, 找到了这篇文章. 其目标是强制SQL Server启动, 并允许接收sqlcmd的修改一些选项的命令.  一旦SQL可以接受命令, 那我们就可以重新指定tempdb的路径了.   然而, 使用文章中的步骤, 我还是无法强制启动SQL Server. 检查Sqlservr.exe /f /c…

http://sqlserverbuilds.blogspot.jp/   What version of SQL Server do I have? This unofficial build chart lists all of the known Service Packs (SP), Cumulative Updates (CU), patches, hotfixes and other builds of MS SQL Server 2016, 2014, 2012, 2008 R2,…