Question

我可以在生产数据库中查看阻止会话。

SELECT * FROM sys.sysprocesses WHERE spid = YOURSPID

我没有杀死会话：Kill <SPID>

阻止会话是否会自行解决？

Answer 1

这取决于活动的用户（如果有）以及执行查询的用户（如果有）。如果有任何活动用户阻止了该会话，那么您必须终止该用户的会话，否则等待他/他的会话结束。您可以执行sp_whoisactive来检查活动用户列表。并检查是否有任何用户阻止了会话，然后您可以明确地终止该用户的会话以使其正常工作。

您还可以参考：Identify the cause of SQL Server blocking。

此查询也是分析详细信息的好方法锁定，并帮助您确定大量块的原因。

WITH [Blocking]
AS (SELECT w.[session_id]
   ,s.[original_login_name]
   ,s.[login_name]
   ,w.[wait_duration_ms]
   ,w.[wait_type]
   ,r.[status]
   ,r.[wait_resource]
   ,w.[resource_description]
   ,s.[program_name]
   ,w.[blocking_session_id]
   ,s.[host_name]
   ,r.[command]
   ,r.[percent_complete]
   ,r.[cpu_time]
   ,r.[total_elapsed_time]
   ,r.[reads]
   ,r.[writes]
   ,r.[logical_reads]
   ,r.[row_count]
   ,q.[text]
   ,q.[dbid]
   ,p.[query_plan]
   ,r.[plan_handle]
 FROM [sys].[dm_os_waiting_tasks] w
 INNER JOIN [sys].[dm_exec_sessions] s ON w.[session_id] = s.[session_id]
 INNER JOIN [sys].[dm_exec_requests] r ON s.[session_id] = r.[session_id]
 CROSS APPLY [sys].[dm_exec_sql_text](r.[plan_handle]) q
 CROSS APPLY [sys].[dm_exec_query_plan](r.[plan_handle]) p
 WHERE w.[session_id] > 50
  AND w.[wait_type] NOT IN ('DBMIRROR_DBM_EVENT'
      ,'ASYNC_NETWORK_IO'))
SELECT b.[session_id] AS [WaitingSessionID]
      ,b.[blocking_session_id] AS [BlockingSessionID]
      ,b.[login_name] AS [WaitingUserSessionLogin]
      ,s1.[login_name] AS [BlockingUserSessionLogin]
      ,b.[original_login_name] AS [WaitingUserConnectionLogin] 
      ,s1.[original_login_name] AS [BlockingSessionConnectionLogin]
      ,b.[wait_duration_ms] AS [WaitDuration]
      ,b.[wait_type] AS [WaitType]
      ,t.[request_mode] AS [WaitRequestMode]
      ,UPPER(b.[status]) AS [WaitingProcessStatus]
      ,UPPER(s1.[status]) AS [BlockingSessionStatus]
      ,b.[wait_resource] AS [WaitResource]
      ,t.[resource_type] AS [WaitResourceType]
      ,t.[resource_database_id] AS [WaitResourceDatabaseID]
      ,DB_NAME(t.[resource_database_id]) AS [WaitResourceDatabaseName]
      ,b.[resource_description] AS [WaitResourceDescription]
      ,b.[program_name] AS [WaitingSessionProgramName]
      ,s1.[program_name] AS [BlockingSessionProgramName]
      ,b.[host_name] AS [WaitingHost]
      ,s1.[host_name] AS [BlockingHost]
      ,b.[command] AS [WaitingCommandType]
      ,b.[text] AS [WaitingCommandText]
      ,b.[row_count] AS [WaitingCommandRowCount]
      ,b.[percent_complete] AS [WaitingCommandPercentComplete]
      ,b.[cpu_time] AS [WaitingCommandCPUTime]
      ,b.[total_elapsed_time] AS [WaitingCommandTotalElapsedTime]
      ,b.[reads] AS [WaitingCommandReads]
      ,b.[writes] AS [WaitingCommandWrites]
      ,b.[logical_reads] AS [WaitingCommandLogicalReads]
      ,b.[query_plan] AS [WaitingCommandQueryPlan]
      ,b.[plan_handle] AS [WaitingCommandPlanHandle]
FROM [Blocking] b
INNER JOIN [sys].[dm_exec_sessions] s1
ON b.[blocking_session_id] = s1.[session_id]
INNER JOIN [sys].[dm_tran_locks] t
ON t.[request_session_id] = b.[session_id]
WHERE t.[request_status] = 'WAIT'
GO

SQL Blocking Session是否会被自己清除？

1 个答案: