Question

当前，我的.NET应用程序的MSSQL数据库中偶尔出现死锁。我正在使用存储过程将数据添加到表“ DATA_CONT”中。此外，还有一个定期任务，从该表中删除旧数据。有时在同时执行插入和删除过程时，会出现死锁。

表DATA_CONT拥有一个聚集索引，其中包含外键CID（唯一标识符）和ResultDate（datetime2（3））。

这是MS SQL的死锁XML图：

<deadlock>
 <victim-list>
  <victimProcess id="process6137528c8" />
 </victim-list>
 <process-list>
  <process id="process6137528c8" taskpriority="5" logused="0" waitresource="KEY: 7:72057594046185472 (0d3d2e12b103)" waittime="1637" ownerId="9357686" transactionname="user_transaction" lasttranstarted="2018-11-12T11:20:55.167" XDES="0x61e4703b0" lockMode="RangeS-U" schedulerid="7" kpid="14644" status="suspended" spid="53" sbid="0" ecid="0" priority="-5" trancount="2" lastbatchstarted="2018-11-12T11:20:55.167" lastbatchcompleted="2018-11-12T11:20:55.167" lastattention="1900-01-01T00:00:00.167" clientapp=".Net SqlClient Data Provider" hostname="FE-Z13YL" hostpid="24056" loginname="DE\afr3fe" isolationlevel="serializable (4)" xactid="9357686" currentdb="7" lockTimeout="1800" clientoption1="673316896" clientoption2="128056">
   <executionStack>
    <frame procname="MyDatabase.dbo.Proc_DeleteDataCont" line="12" stmtstart="708" stmtend="954" sqlhandle="0x03000700f2a6e25b72b58a0092a9000001000000000000000000000000000000000000000000000000000000">
Delete From
        [DATA_CONT]
    WHERE
        CID = @p_CID AND
        (@p_DeleteOlderThan IS NULL OR ResultDate &lt; @p_DeleteOlderThan    </frame>
   </executionStack>
   <inputbuf>
Proc [Database Id = 7 Object Id = 1541580530]   </inputbuf>
  </process>
  <process id="process658113468" taskpriority="0" logused="592" waitresource="KEY: 7:72057594046185472 (ae5185f64403)" waittime="1711" ownerId="9357687" transactionname="user_transaction" lasttranstarted="2018-11-12T11:20:55.170" XDES="0x65cd77000" lockMode="RangeI-N" schedulerid="6" kpid="21008" status="suspended" spid="52" sbid="0" ecid="0" priority="0" trancount="2" lastbatchstarted="2018-11-12T11:20:55.170" lastbatchcompleted="2018-11-12T11:20:55.170" lastattention="1900-01-01T00:00:00.170" clientapp=".Net SqlClient Data Provider" hostname="FE-Z13YL" hostpid="24056" loginname="DE\afr3fe" isolationlevel="serializable (4)" xactid="9357687" currentdb="7" lockTimeout="4294967295" clientoption1="673316896" clientoption2="128056">
   <executionStack>
    <frame procname="MyDatabase.dbo.Proc_AddDataCont" line="8" stmtstart="266" stmtend="598" sqlhandle="0x030007005654c5593a84070188a9000001000000000000000000000000000000000000000000000000000000">
INSERT INTO [DATA_CONT] SELECT CID, Value, LocationData, ResultDate, GETUTCDATE() FROM @p_DataContLis    </frame>
   </executionStack>
   <inputbuf>
Proc [Database Id = 7 Object Id = 1506104406]   </inputbuf>
  </process>
 </process-list>
 <resource-list>
  <keylock hobtid="72057594046185472" dbid="7" objectname="MyDatabase.dbo.DATA_CONT" indexname="IX_DATA_CONT" id="lock620b19a80" mode="X" associatedObjectId="72057594046185472">
   <owner-list>
    <owner id="process658113468" mode="X" />
   </owner-list>
   <waiter-list>
    <waiter id="process6137528c8" mode="RangeS-U" requestType="wait" />
   </waiter-list>
  </keylock>
  <keylock hobtid="72057594046185472" dbid="7" objectname="MyDatabase.dbo.DATA_CONT" indexname="IX_DATA_CONT" id="lock620b19800" mode="RangeS-U" associatedObjectId="72057594046185472">
   <owner-list>
    <owner id="process6137528c8" mode="RangeS-U" />
   </owner-list>
   <waiter-list>
    <waiter id="process658113468" mode="RangeI-N" requestType="wait" />
   </waiter-list>
  </keylock>
 </resource-list>
</deadlock>

对我来说，两个锁似乎都在升级。如何避免这种行为？

Answer 1

我认为删除过程中不时跳过某些行并不重要。我的想法是在使用“ READPAST”提示进行删除时跳过锁定的行，例如：

Delete From
    [DATA_CONT] WITH (READPAST)
WHERE
    CID = @p_CID AND
    (@p_DeleteOlderThan IS NULL OR ResultDate &lt; @p_DeleteOlderThan

同时插入和删除时出现SQL死锁

1 个答案: