SQLServer 事务、锁、阻塞

检查阻塞：

1. sys.dm_tran_locks (SQLServer2000中需要使用sp_lock或系统表syslockinfo)

代码

SELECT
  request_session_id             AS  spid,
  resource_type                  AS  restype,
  resource_database_id           AS  dbid,
  resource_description           AS  res,
  resource_associated_entity_id  AS  resid,
  request_mode                   AS  mode,
  request_status                 AS  status
FROM  sys.dm_tran_locks;

2. 查询sys.dm_exec_connections视图可以得到发生冲突的连接信息；查询sys.dm_exec_sessions视图可以得到发生冲突的会话信息。（SQLServer2000中可以使用sp_who/sp_who2或系统表sysprocesses)

SELECT   *   FROM  sys.dm_exec_connections
WHERE  session_id  IN ( 53 ,  51 );

SELECT   *   FROM  sys.dm_exec_sessions
WHERE  session_id  IN ( 53 ,  51 );

详见SQLServer2005 Inside - Program第9章

SELECT   *   FROM  sys.dm_exec_requests
WHERE  blocking_session_id  >   0 ;