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  • SQL SERVER-查看语句申请锁的情况

    想要观察一个SQL语句运行过程中申请了哪些锁,打开一个查询写入要被观察的SQL

    --查询当前会话的sessionID
    SELECT @@SPID
    
    
    SET TRANSACTION ISOLATION LEVEL  REPEATABLE READ
    
    BEGIN TRAN
    
    SELECT [data] FROM [MyTable] WHERE [index_column]>30 AND [index_column]<40  
    
    
    ---执行了上面的SQL,观察完后再回滚
    
    ROLLBACK 

    在打开另外一个查询,查询上个语句运行的锁情况

    --填入要观察的sesionID,
    
    SELECT 
    request_session_id,
    resource_type,
    request_status,
    request_mode,
    resource_description,
    OBJECT_NAME(p.object_id) as object_name,
    i.name,
    p.index_id
    FROM sys.dm_tran_locks  t
    LEFT JOIN sys.partitions p  on  t.resource_associated_entity_id=p.hobt_id
    LEFT JOIN  sys.indexes i on  i.object_id=p.object_id and p.index_id=i.index_id
    WHERE  request_session_id=88
    ORDER BY request_session_id,resource_type

    查询该进程等待的锁资源

    SELECT 
    request_session_id,
    resource_type,
    request_status,
    request_mode,
    resource_description,
    OBJECT_NAME(p.object_id) as object_name,
    i.name,
    p.index_id
    FROM sys.dm_tran_locks  t
    LEFT JOIN sys.partitions p  on  t.resource_associated_entity_id=p.hobt_id
    LEFT JOIN  sys.indexes i on  i.object_id=p.object_id and p.index_id=i.index_id
    WHERE  request_status='WAIT'  AND  request_session_id=87
    ORDER BY request_session_id,resource_type

    执行计划+锁情况  可以推断出执行的过程。

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  • 原文地址:https://www.cnblogs.com/JinweiChang/p/12148923.html
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