原文:为什么数据库有时候不能定位阻塞（Blocker）源头的SQL语句在SQL Server数据库或OACLE数据库当中，通常一个会话持有某个资源的锁，而另一个会话在请求这个资源，就会出现阻塞（blocking）。这是DBA经常会遇到的情况。当出现SQL语句的阻塞时，很多人想查看阻塞的源头（哪个SQL语句阻塞了哪个SQL），这样方便直观、简洁明了的定位问题。...

文章 2011-12-14 来自：开发者社区

[20111214]oradebug快速定位有问题的sql语句

[20111214]oradebug快速定位有问题的sql语句oradebug自己平时很少使用,但是使用它定位有问题的sql还是非常快捷的，记录如下:例子：1.打开会话1，建立一个笛卡尔集，在我的测试机器大约需要150秒才能完成：SQL> select count(*) from emp,emp,emp,emp,emp,emp,emp,emp;2.使用工具查询那个进程比较忙，方法很多！to....

文章 1970-01-01 来自：开发者社区

为什么数据库有时候不能定位阻塞（Blocker）源头的SQL语句

在SQL Server数据库或OACLE数据库当中，通常一个会话持有某个资源的锁，而另一个会话在请求这个资源，就会出现阻塞（blocking）。这是DBA经常会遇到的情况。当出现SQL语句的阻塞时，很多人想查看阻塞的源头（哪个SQL语句阻塞了哪个SQL），这样方便直观、简洁明了的定位问题。但是很多时候，很多场景，我们通过SQL语句并不能或者说不容易定位到阻塞者...

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