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解释死锁日志/XDL 文件

tag-icon • tag-icon sql ssms xml tsql debug
解释死锁日志/XDL 文件

我生成了以下 XML + XDL： 在此处输入图片描述

<deadlock>
  <victim-list>
    <victimProcess id="processc1eaf13468" />
  </victim-list>
  <process-list>
    <process id="processc1eaf13468" taskpriority="0" logused="892" waitresource="KEY: 11:72057594044547072 (c9fb1da9313f)" waittime="5244" ownerId="118489" transactionname="user_transaction" lasttranstarted="2017-06-27T15:17:20.250" XDES="0xc1e878c4c0" lockMode="S" schedulerid="1" kpid="144900" status="suspended" spid="119" sbid="2" ecid="0" priority="0" trancount="2" lastbatchstarted="2017-06-27T15:20:22.437" lastbatchcompleted="2017-06-27T15:17:21.003" lastattention="1900-01-01T00:00:00.003" clientapp=".Net SqlClient Data Provider" hostname="MIKBEN-W530" hostpid="30520" loginname="HuddleFm" isolationlevel="read committed (2)" xactid="118489" currentdb="11" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056">
      <executionStack>
        <frame procname="unknown" queryhash="0x05ff9bdd8b808318" queryplanhash="0x5cc8b281eb7808cd" line="1" stmtstart="256" stmtend="970" sqlhandle="0x020000005f1e5a01ca72346b429f4c909878692fbda9bbd20000000000000000000000000000000000000000">
unknown    </frame>
        <frame procname="unknown" queryhash="0x0000000000000000" queryplanhash="0x0000000000000000" line="1" sqlhandle="0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000">
unknown    </frame>
      </executionStack>
      <inputbuf>
(@0 nvarchar(512),@1 int,@2 int,@3 bigint,@4 int,@5 int,@6 int,@7 datetime2(7),@8 int,@9 int,@10 bit,@11 bit,@12 nvarchar(max) )INSERT [dbo].[AppEvent]([MediaPath], [StorageProvider], [MediaType], [MediaSizeInBytes], [OldSessionState], [NewSessionState], [AppEventType], [EventDate], [DeviceSessionId], [TargetSessionId], [UserId], [ShouldBeDeleted], [HasBeenDeleted], [Payload], [LocalBrowserSessionGuid])
VALUES (@0, @1, @2, @3, @4, @5, @6, @7, @8, NULL, @9, @10, @11, NULL, @12)
SELECT [AppEventId]
FROM [dbo].[AppEvent]
WHERE @@ROWCOUNT &gt; 0 AND [AppEventId] = scope_identity()   </inputbuf>
    </process>
    <process id="processc1e7c26ca8" taskpriority="0" logused="1064" waitresource="KEY: 11:72057594043170816 (40fd182c0dd9)" waittime="5396" ownerId="118496" transactionname="user_transaction" lasttranstarted="2017-06-27T15:17:20.890" XDES="0xc1e88b44c0" lockMode="S" schedulerid="1" kpid="194344" status="suspended" spid="123" sbid="2" ecid="0" priority="0" trancount="2" lastbatchstarted="2017-06-27T15:20:22.283" lastbatchcompleted="2017-06-27T15:17:21.060" lastattention="1900-01-01T00:00:00.060" clientapp=".Net SqlClient Data Provider" hostname="MIKBEN-W530" hostpid="30520" loginname="HuddleFm" isolationlevel="read committed (2)" xactid="118496" currentdb="11" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056">
      <executionStack>
        <frame procname="unknown" queryhash="0xebf55cdceee65c9c" queryplanhash="0x5cc8b281eb7808cd" line="1" stmtstart="220" stmtend="936" sqlhandle="0x0200000066a736157a1b98ec891323511cd809b8ea3bf4a30000000000000000000000000000000000000000">
unknown    </frame>
        <frame procname="unknown" queryhash="0x0000000000000000" queryplanhash="0x0000000000000000" line="1" sqlhandle="0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000">
unknown    </frame>
      </executionStack>
      <inputbuf>
(@0 int,@1 int,@2 bigint,@3 int,@4 int,@5 int,@6 datetime2(7),@7 int,@8 int,@9 bit,@10 bit,@11 nvarchar(max) )INSERT [dbo].[AppEvent]([MediaPath], [StorageProvider], [MediaType], [MediaSizeInBytes], [OldSessionState], [NewSessionState], [AppEventType], [EventDate], [DeviceSessionId], [TargetSessionId], [UserId], [ShouldBeDeleted], [HasBeenDeleted], [Payload], [LocalBrowserSessionGuid])
VALUES (NULL, @0, @1, @2, @3, @4, @5, @6, @7, NULL, @8, @9, @10, NULL, @11)
SELECT [AppEventId]
FROM [dbo].[AppEvent]
WHERE @@ROWCOUNT &gt; 0 AND [AppEventId] = scope_identity()   </inputbuf>
    </process>
  </process-list>
  <resource-list>
    <keylock hobtid="72057594044547072" dbid="11" objectname="e6288089-3180-4261-aa4e-916673f3cd8a.dbo.DeviceSession" indexname="PK_dbo.DeviceSession" id="lockc1f1b6b300" mode="X" associatedObjectId="72057594044547072">
      <owner-list>
        <owner id="processc1e7c26ca8" mode="X" />
      </owner-list>
      <waiter-list>
        <waiter id="processc1eaf13468" mode="S" requestType="wait" />
      </waiter-list>
    </keylock>
    <keylock hobtid="72057594043170816" dbid="11" objectname="e6288089-3180-4261-aa4e-916673f3cd8a.dbo.User" indexname="PK_dbo.User" id="lockc1f1b6c280" mode="X" associatedObjectId="72057594043170816">
      <owner-list>
        <owner id="processc1eaf13468" mode="X" />
      </owner-list>
      <waiter-list>
        <waiter id="processc1e7c26ca8" mode="S" requestType="wait" />
      </waiter-list>
    </keylock>
  </resource-list>
</deadlock>

我现在想了解导致死锁的原因；我以前从未解释过这种日志。我看到User和之间存在一些争用，DeviceSession但我不确定这是从哪里来的。如何解释 XDL/死锁转储？

答案1

出现死锁的原因是每个会话都已获取锁定（在不同的资源上），并且随后想要获取另一个会话已持有的锁定。

避免死锁的最简单方法是始终在整个软件中以相同的顺序执行操作。这将允许第二个会话阻塞，直到第一个会话完成其任务。

我还假设您没有使用快照隔离。这将阻止读取器阻止写入器，并且很可能解决此问题。 https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/sql/snapshot-isolation-in-sql-server

快照隔离确实会占用更多内存，因此不要直接打开它。使用和不使用快照隔离，请对您的应用程序进行性能分析。

此外，InputBuf 元素指的是正在运行的当前语句（请求锁），而不是导致现有锁发生的语句。

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