查询SQL Server system session ID？
今天在论坛看到一篇文章问到为什么SQL Server系统的SESSION> 在2005之前查询用户会话使用：select * from sysprocesses wherespid < 50
但是在SQL Server 2005之后已经没有这个限制了，我在MSDN上找到了下面这篇文章：How It Works: System Sessions
Looking at a SQL Server error log it is formatted with the date, time and session>. Many of the>s following the spid value.
2008-01-08 20:03:36.12 spid5s
The s indicates that the session is a system session. Prior to SQL Server 2005 all system sessions were limited to session>
Instead of the older "select * from sysprocesses where spid < 50" you should use "select * from sys.dm_exec_sessions where is_user_process = 0" to>
根据上面的讲法系统Session> select * from sys.dm_exec_sessionswhereis_user_process = 1
is_user_process
bit
如果会话是系统会话，则为 0。否则，为 1。不可为空值
更多信息参考：http://msdn.microsoft.com/zh-cn/library/ms176013(v=sql.90).aspx
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