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我正在尝试学习如何分析SQL Server 2008 的死锁图，并且我发现了很多带有空<victim-list>节点的条目。我不明白这些条目代表什么：如果没有受害者，我如何识别导致死锁的等待资源？这些条目是什么意思？

这是我看到的条目的一个快速示例：

<deadlock-list>
 <deadlock>
  <victim-list />
  <process-list>
   <process id="processd2b6508" taskpriority="0" logused="10000" waittime="31" schedulerid="63" kpid="9104" status="suspended" spid="69" sbid="0" ecid="184" priority="0" trancount="0" lastbatchstarted="2012-07-30T01:10:45.550" lastbatchcompleted="2012-07-30T01:10:45.550" clientapp=".Net SqlClient Data Provider" hostname="XXXXXXX" hostpid="3648" isolationlevel="read committed (2)" xactid="30461033" currentdb="5" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056">
    <executionStack>
     <frame procname="" line="1" sqlhandle="0x020000002340c50225c17d0eec9bf7c51129348edffd1c70" /> 
     <!--About 2 more frame tags... -->
    </executionStack>
    <inputbuf /> 
   </process>
   <!-- 3 or so more process tags... -->
  </process-list>
  <resource-list>
   <exchangeEvent id="Pipeb005eeba0" WaitType="e_waitPipeNewRow" nodeId="7">
    <owner-list>
     <owner id="processd23fdc8" /> 
    </owner-list>
    <waiter-list>
     <waiter …

在 SQL Server 2008 R2 中，我收到了几个死锁报告，输入缓冲区中有“*password------------”。看起来像是攻击，但在那种情况下，我不知道攻击的原因或类型。

（日志是由一位经验丰富的 DBA 专家生成的，并告诉我，不是我）

有谁知道它是什么？谢谢！

例子：

<?xml version="1.0"?>
<blocked-process>
  <process id="process879948" taskpriority="0" logused="0" waitresource="KEY: 5:72057602473263104 (1d69201d0ba6)" waittime="5185" ownerId="88389135" transactionname="SELECT" lasttranstarted="2012-09-25T18:11:02.507" XDES="0x1f7d2a590" lockMode="S" schedulerid="2" kpid="4552" status="suspended" spid="86" sbid="2" ecid="0" priority="0" trancount="0" lastbatchstarted="2012-09-25T18:11:02.507" lastbatchcompleted="2012-09-25T18:11:02.507" lastattention="2012-09-25T18:07:35.740" clientapp=".Net SqlClient Data Provider" hostname="IP-xxxxxxxx" hostpid="4868" loginname="sa" isolationlevel="read committed (2)" xactid="88389135" currentdb="1" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056">
    <executionStack>
      <frame line="14" stmtstart="374" stmtend="764" sqlhandle="0x03000500dac2967f208e4000a19d00000000000000000000"/>
      <frame line="1" stmtstart="44" sqlhandle="0x02000000632f7e131f79ec7312284505961e537a61b81be7"/>
      <frame line="1" sqlhandle="0x000000000000000000000000000000000000000000000000"/>
    </executionStack>
    <inputbuf>

*password---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------   </inputbuf>
  </process>
</blocked-process>

我一直在处理死锁，特别是获取他们的信息，正如你在这篇文章中看到的。

在同一篇文章中，Shanky推荐了“您现在必须依靠扩展事件跟踪来捕获死锁信息”

我的问题是：

1) 使用扩展事件是否会增加 CPU？

2) 它使用了多少内存、磁盘空间和 I/O？

任何相关文档的链接都将是奖励。

我目前正在使用此灾难通过读取system_health扩展事件环形缓冲区来定位最近的死锁。

select top 2000000000
      XEvent.value('@timestamp', 'datetime2(3)') as CreationDateUtc,
      --
      -- Extract the <deadlock>...</deadlock> tag from within the event
      -- Todo: Surely there is a better (xml) way to do this.
      --
      substring(convert(varchar(max), XEvent.query('.')), 
          -- start
          patindex('%<deadlock%', convert(varchar(max), XEvent.query('.'))),          
          -- end
          patindex('%</deadlock%', convert(varchar(max), XEvent.query('.'))) -
              patindex('%<deadlock%', convert(varchar(max), XEvent.query('.'))) + 11 -- 11 to include for '</deadlock>'
          ) AS XdlFile
 from 
    (
      select cast (target_data as xml) as TargetData
        from sys.dm_xe_session_targets st with (nolock)
        join sys.dm_xe_sessions s with (nolock)
          on …