原文:MS SQL 监控错误日志的告警信息 SQL Server的错误消息（Error Message）按照消息的严重级别一共划分25个等级，级别越高，表示严重性也越高。但是如果你统计sys.messages,你会发现，实际上只有16（SQL SERVER 2008/2012）或17个（SQL SERVER 2005）个级别。猜测应该是一些留作扩展用，一些留作...

文章 2017-07-03 来自：开发者社区

SQL Server 监控统计阻塞脚本信息

数据库产生阻塞（Blocking）的本质原因：SQL语句连续持有锁的时间过长，数目过多，粒度过大。阻塞是事务隔离带来的副作用，它是不可避免的，而且是一个数据库系统常见的现象。但是阻塞的时间和出现频率要控制在一定的范围内，阻塞持续的时间过长或阻塞出现过多（过于频繁），就会对数据库性能产生严重的影响。　　很多时候，DBA需要知道数据库在出现性能问题时，有没有发生阻塞？什么时候开始的？发生....

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