死锁谜题：受害者不拥有任何资源，用于解决死锁

发布于 2024-11-08 15:17:12 字数 11608 浏览 4 评论 0原文

我有一个奇怪的死锁图，其中 MSSQL Server 2008 选择的受害者不是死锁循环的一部分。此死锁发生在 select 和 insert 之间。死锁资源是一个表，所有 select 都需要 waitresource = "KEY: 6:72057594098810880 (ffffffffffff)"

问题1：这里是否 ffffffffffff意味着他们想要对整个表进行全方位锁定？还是整个键范围？还是别的什么？

我们遵循一条规则，表中永远不会有主键 id = 0 的行。我们很少有地方会进行这种检查

select foo from bar where @someId = 0 OR SomeId = @someId。

我还了解到 SQL 不会短路表达式。因此，如果我传递 @someId = 0 ，并不能保证其他部分不会被评估。因此 SQL 可以在运行时执行 SomeId = @someId。

问题2：由于无法在 SomeId 中找到 0，SQL 将获取整个表（或行）的范围锁，因此没有其他人插入 0 id。正确的？

考虑到这个假设，我将 where 子句更改为这样，

(CASE
       WHEN @someId = 0 THEN 1
       WHEN SomeId = @someId THEN 1
       ELSE 0
END = 1)

希望这将强制执行评估顺序。但我错了。我又陷入僵局了我在下面附上了死锁图。我已经重命名了涉及的表和存储过程（公司政策）

问题3：你知道我在这里缺少什么吗？

在此处输入图像描述

  <deadlock-list>
 <deadlock victim="process722c508">
  <process-list>
   <process id="process722c508" taskpriority="0" logused="0" waitresource="KEY: 6:72057594098810880 (ffffffffffff)" waittime="6217" ownerId="24219001" transactionname="SELECT" lasttranstarted="2011-05-17T03:29:16.033" XDES="0x80073a40" lockMode="RangeS-S" schedulerid="13" kpid="20436" status="suspended" spid="91" sbid="0" ecid="0" priority="0" trancount="0" lastbatchstarted="2011-05-17T03:29:16.033" lastbatchcompleted="2011-05-17T03:29:16.033" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24219001" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="fnGetTableResultAByBId" line="44" stmtstart="2246" stmtend="3566" sqlhandle="0x03000600800d7f0bda124000d99e00000000000000000000">
INSERT INTO @ReturnTable
    SELECT Foo, Bar
    FROM TheOneTable 
    WHERE ZId = @zId 
    AND (CASE
            WHEN @yId = 0 THEN 1
            WHEN YId = @yId THEN 1
            ELSE 0
        END = 1)
    AND (CASE
            WHEN @xId = 0 THEN 1
            WHEN XId = @xId THEN 1
            ELSE 0
        END = 1)     </frame>
     <frame procname="GetViewCByDId" line="9" stmtstart="272" stmtend="2984" sqlhandle="0x03000600c21629025d8f3f00d99e00000100000000000000">
    </frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 36247234]    </inputbuf>
   </process>
   <process id="process7185048" taskpriority="0" logused="0" waitresource="KEY: 6:72057594098810880 (ffffffffffff)" waittime="6217" ownerId="24218992" transactionname="SELECT" lasttranstarted="2011-05-17T03:29:16.030" XDES="0x179980430" lockMode="RangeS-S" schedulerid="13" kpid="30616" status="suspended" spid="79" sbid="0" ecid="0" priority="0" trancount="0" lastbatchstarted="2011-05-17T03:29:16.030" lastbatchcompleted="2011-05-17T03:29:16.030" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24218992" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="fnGetTableResultAByBId" line="44" stmtstart="2246" stmtend="3566" sqlhandle="0x03000600800d7f0bda124000d99e00000000000000000000">
INSERT INTO @ReturnTable
    SELECT Foo, Bar
    FROM TheOneTable 
    WHERE ZId = @zId 
    AND (CASE
            WHEN @yId = 0 THEN 1
            WHEN YId = @yId THEN 1
            ELSE 0
        END = 1)
    AND (CASE
            WHEN @xId = 0 THEN 1
            WHEN XId = @xId THEN 1
            ELSE 0
        END = 1)     </frame>
     <frame procname="GetViewCByDId" line="9" stmtstart="272" stmtend="2984" sqlhandle="0x03000600c21629025d8f3f00d99e00000100000000000000">
</frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 36247234]    </inputbuf>
   </process>
   <process id="process7223048" taskpriority="0" logused="0" waitresource="KEY: 6:72057594098810880 (ffffffffffff)" waittime="5330" ownerId="24235090" transactionname="SELECT" lasttranstarted="2011-05-17T03:29:16.927" XDES="0x840d3b30" lockMode="RangeS-S" schedulerid="15" kpid="23452" status="suspended" spid="88" sbid="0" ecid="0" priority="0" trancount="0" lastbatchstarted="2011-05-17T03:29:16.927" lastbatchcompleted="2011-05-17T03:29:16.927" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24235090" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="GetOneRowEByFId" line="11" stmtstart="260" stmtend="2456" sqlhandle="0x03000600db082c08ba823f00d99e00000100000000000000">
         SELECT TOP 1
         Col1, Col2, Col3

         FROM The2ndTable
         INNER JOIN [dbo].[TheOneTable] ON [dbo].[TheOneTable].[LinkBetweenOneAndTwoId]=[The2ndTable].[LinkBetweenOneAndTwoId]
         WHERE [dbo].[TheOneTable].ZId= @ActivityId and
         [TheOneTable].[n
     </frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 137103579]    </inputbuf>
   </process>
   <process id="process6334088" taskpriority="0" logused="0" waitresource="KEY: 6:72057594098810880 (ffffffffffff)" waittime="5668" ownerId="24229434" transactionname="SELECT" lasttranstarted="2011-05-17T03:29:16.587" XDES="0x17ea9ac90" lockMode="RangeS-S" schedulerid="12" kpid="5104" status="suspended" spid="86" sbid="0" ecid="0" priority="0" trancount="0" lastbatchstarted="2011-05-17T03:29:16.587" lastbatchcompleted="2011-05-17T03:29:16.587" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24229434" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="GetOneRowEByFId" line="11" stmtstart="260" stmtend="2456" sqlhandle="0x03000600db082c08ba823f00d99e00000100000000000000">
SELECT TOP 1 
    Col1, Col2, Col3

    FROM The2ndTable
    INNER JOIN [dbo].[TheOneTable] ON [dbo].[TheOneTable].[LinkBetweenOneAndTwoId]=[The2ndTable].[LinkBetweenOneAndTwoId]
    WHERE [dbo].[TheOneTable].ZId= @ActivityId and
        [TheOneTable].[n</frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 137103579]    </inputbuf>
   </process>
   <process id="process8808e08" taskpriority="0" logused="0" waitresource="KEY: 6:72057594098810880 (ffffffffffff)" waittime="6652" ownerId="24217112" transactionname="SELECT" lasttranstarted="2011-05-17T03:29:15.610" XDES="0x833b5ca0" lockMode="RangeS-S" schedulerid="1" kpid="19752" status="suspended" spid="89" sbid="0" ecid="0" priority="0" trancount="0" lastbatchstarted="2011-05-17T03:29:15.610" lastbatchcompleted="2011-05-17T03:29:15.610" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24217112" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="GetOneRowEByFId" line="11" stmtstart="260" stmtend="2456" sqlhandle="0x03000600db082c08ba823f00d99e00000100000000000000">
         SELECT TOP 1
         Col1, Col2, Col3

         FROM The2ndTable
         INNER JOIN [dbo].[TheOneTable] ON [dbo].[TheOneTable].[LinkBetweenOneAndTwoId]=[The2ndTable].[LinkBetweenOneAndTwoId]
         WHERE [dbo].[TheOneTable].ZId= @ActivityId and
         [TheOneTable].[n
     </frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 137103579]    </inputbuf>
   </process>
   <process id="process5c08988" taskpriority="0" logused="1644" waitresource="KEY: 6:72057594098810880 (91a0638558d2)" waittime="4889" ownerId="24214248" transactionname="user_transaction" lasttranstarted="2011-05-17T03:29:15.327" XDES="0x186609470" lockMode="RangeI-N" schedulerid="9" kpid="9000" status="suspended" spid="102" sbid="0" ecid="0" priority="0" trancount="2" lastbatchstarted="2011-05-17T03:29:15.330" lastbatchcompleted="2011-05-17T03:29:15.330" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24214248" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="InsertIntoTheOneTable" line="25" stmtstart="1334" stmtend="2608" sqlhandle="0x03000600bbbacb5d25883f00d99e00000100000000000000">
INSERT INTO [dbo].[TheOneTable] (Some,Col,Here)
    VALUES (@some,@col,@here)     </frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 1573632699]    </inputbuf>
   </process>
  </process-list>
  <resource-list>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6b17a00" mode="RangeI-N" associatedObjectId="72057594098810880">
    <owner-list />
    <waiter-list>
     <waiter id="process722c508" mode="RangeS-S" requestType="wait" />
    </waiter-list>
   </keylock>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6b17a00" mode="RangeI-N" associatedObjectId="72057594098810880">
    <owner-list />
    <waiter-list>
     <waiter id="process7185048" mode="RangeS-S" requestType="wait" />
    </waiter-list>
   </keylock>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6b17a00" mode="RangeI-N" associatedObjectId="72057594098810880">
    <owner-list />
    <waiter-list>
     <waiter id="process7223048" mode="RangeS-S" requestType="wait" />
    </waiter-list>
   </keylock>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6b17a00" mode="RangeI-N" associatedObjectId="72057594098810880">
    <owner-list />
    <waiter-list>
     <waiter id="process6334088" mode="RangeS-S" requestType="wait" />
    </waiter-list>
   </keylock>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6b17a00" mode="RangeI-N" associatedObjectId="72057594098810880">
    <owner-list>
     <owner id="process5c08988" mode="RangeI-N" />
    </owner-list>
    <waiter-list>
     <waiter id="process8808e08" mode="RangeS-S" requestType="wait" />
    </waiter-list>
   </keylock>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6372e80" mode="RangeS-S" associatedObjectId="72057594098810880">
    <owner-list>
     <owner id="process7223048" mode="RangeS-S" />
     <owner id="process6334088" mode="RangeS-S" />
    </owner-list>
    <waiter-list>
     <waiter id="process5c08988" mode="RangeI-N" requestType="wait" />
    </waiter-list>
   </keylock>
  </resource-list>
 </deadlock>
</deadlock-list>

原文

I've strange deadlock graph where the victim chosen by MSSQL server 2008 isn't part of the deadlock loop.
This deadlock is between select and insert.
The deadlock resource is a single table where all selects want waitresource = "KEY: 6:72057594098810880 (ffffffffffff)"

Question1 : Does ffffffffffff here mean they want a full range lock on whole table? Or whole key range? Or something else?

We are following a rule where table will never have a row with primary key id = 0.
There are few places where we do this kind of check

select foo from bar where @someId = 0 OR SomeId = @someId.

I also came to know about that SQL doesn't short-circuit the expression. So if I pass @someId = 0 that doesn't guarantee the other part won't be evaluated. So it's possible that SQL can execute at runtime SomeId = @someId.

Question2 : Since it wasn't able to find 0 in SomeId, SQL will acquire a range lock on whole table (or row) so no one else inserts 0 id. Right?

With that assumption in mind I changed the where clause to this

(CASE
       WHEN @someId = 0 THEN 1
       WHEN SomeId = @someId THEN 1
       ELSE 0
END = 1)

hoping that this will force evaluation order. But I'm wrong. I'm getting the deadlock again.
I've attached the deadlock graph below. I've renamed tables and sprocs involved (Company policy)

Question3 : Do you know what I'm missing here?

enter image description here

  <deadlock-list>
 <deadlock victim="process722c508">
  <process-list>
   <process id="process722c508" taskpriority="0" logused="0" waitresource="KEY: 6:72057594098810880 (ffffffffffff)" waittime="6217" ownerId="24219001" transactionname="SELECT" lasttranstarted="2011-05-17T03:29:16.033" XDES="0x80073a40" lockMode="RangeS-S" schedulerid="13" kpid="20436" status="suspended" spid="91" sbid="0" ecid="0" priority="0" trancount="0" lastbatchstarted="2011-05-17T03:29:16.033" lastbatchcompleted="2011-05-17T03:29:16.033" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24219001" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="fnGetTableResultAByBId" line="44" stmtstart="2246" stmtend="3566" sqlhandle="0x03000600800d7f0bda124000d99e00000000000000000000">
INSERT INTO @ReturnTable
    SELECT Foo, Bar
    FROM TheOneTable 
    WHERE ZId = @zId 
    AND (CASE
            WHEN @yId = 0 THEN 1
            WHEN YId = @yId THEN 1
            ELSE 0
        END = 1)
    AND (CASE
            WHEN @xId = 0 THEN 1
            WHEN XId = @xId THEN 1
            ELSE 0
        END = 1)     </frame>
     <frame procname="GetViewCByDId" line="9" stmtstart="272" stmtend="2984" sqlhandle="0x03000600c21629025d8f3f00d99e00000100000000000000">
    </frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 36247234]    </inputbuf>
   </process>
   <process id="process7185048" taskpriority="0" logused="0" waitresource="KEY: 6:72057594098810880 (ffffffffffff)" waittime="6217" ownerId="24218992" transactionname="SELECT" lasttranstarted="2011-05-17T03:29:16.030" XDES="0x179980430" lockMode="RangeS-S" schedulerid="13" kpid="30616" status="suspended" spid="79" sbid="0" ecid="0" priority="0" trancount="0" lastbatchstarted="2011-05-17T03:29:16.030" lastbatchcompleted="2011-05-17T03:29:16.030" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24218992" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="fnGetTableResultAByBId" line="44" stmtstart="2246" stmtend="3566" sqlhandle="0x03000600800d7f0bda124000d99e00000000000000000000">
INSERT INTO @ReturnTable
    SELECT Foo, Bar
    FROM TheOneTable 
    WHERE ZId = @zId 
    AND (CASE
            WHEN @yId = 0 THEN 1
            WHEN YId = @yId THEN 1
            ELSE 0
        END = 1)
    AND (CASE
            WHEN @xId = 0 THEN 1
            WHEN XId = @xId THEN 1
            ELSE 0
        END = 1)     </frame>
     <frame procname="GetViewCByDId" line="9" stmtstart="272" stmtend="2984" sqlhandle="0x03000600c21629025d8f3f00d99e00000100000000000000">
</frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 36247234]    </inputbuf>
   </process>
   <process id="process7223048" taskpriority="0" logused="0" waitresource="KEY: 6:72057594098810880 (ffffffffffff)" waittime="5330" ownerId="24235090" transactionname="SELECT" lasttranstarted="2011-05-17T03:29:16.927" XDES="0x840d3b30" lockMode="RangeS-S" schedulerid="15" kpid="23452" status="suspended" spid="88" sbid="0" ecid="0" priority="0" trancount="0" lastbatchstarted="2011-05-17T03:29:16.927" lastbatchcompleted="2011-05-17T03:29:16.927" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24235090" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="GetOneRowEByFId" line="11" stmtstart="260" stmtend="2456" sqlhandle="0x03000600db082c08ba823f00d99e00000100000000000000">
         SELECT TOP 1
         Col1, Col2, Col3

         FROM The2ndTable
         INNER JOIN [dbo].[TheOneTable] ON [dbo].[TheOneTable].[LinkBetweenOneAndTwoId]=[The2ndTable].[LinkBetweenOneAndTwoId]
         WHERE [dbo].[TheOneTable].ZId= @ActivityId and
         [TheOneTable].[n
     </frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 137103579]    </inputbuf>
   </process>
   <process id="process6334088" taskpriority="0" logused="0" waitresource="KEY: 6:72057594098810880 (ffffffffffff)" waittime="5668" ownerId="24229434" transactionname="SELECT" lasttranstarted="2011-05-17T03:29:16.587" XDES="0x17ea9ac90" lockMode="RangeS-S" schedulerid="12" kpid="5104" status="suspended" spid="86" sbid="0" ecid="0" priority="0" trancount="0" lastbatchstarted="2011-05-17T03:29:16.587" lastbatchcompleted="2011-05-17T03:29:16.587" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24229434" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="GetOneRowEByFId" line="11" stmtstart="260" stmtend="2456" sqlhandle="0x03000600db082c08ba823f00d99e00000100000000000000">
SELECT TOP 1 
    Col1, Col2, Col3

    FROM The2ndTable
    INNER JOIN [dbo].[TheOneTable] ON [dbo].[TheOneTable].[LinkBetweenOneAndTwoId]=[The2ndTable].[LinkBetweenOneAndTwoId]
    WHERE [dbo].[TheOneTable].ZId= @ActivityId and
        [TheOneTable].[n</frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 137103579]    </inputbuf>
   </process>
   <process id="process8808e08" taskpriority="0" logused="0" waitresource="KEY: 6:72057594098810880 (ffffffffffff)" waittime="6652" ownerId="24217112" transactionname="SELECT" lasttranstarted="2011-05-17T03:29:15.610" XDES="0x833b5ca0" lockMode="RangeS-S" schedulerid="1" kpid="19752" status="suspended" spid="89" sbid="0" ecid="0" priority="0" trancount="0" lastbatchstarted="2011-05-17T03:29:15.610" lastbatchcompleted="2011-05-17T03:29:15.610" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24217112" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="GetOneRowEByFId" line="11" stmtstart="260" stmtend="2456" sqlhandle="0x03000600db082c08ba823f00d99e00000100000000000000">
         SELECT TOP 1
         Col1, Col2, Col3

         FROM The2ndTable
         INNER JOIN [dbo].[TheOneTable] ON [dbo].[TheOneTable].[LinkBetweenOneAndTwoId]=[The2ndTable].[LinkBetweenOneAndTwoId]
         WHERE [dbo].[TheOneTable].ZId= @ActivityId and
         [TheOneTable].[n
     </frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 137103579]    </inputbuf>
   </process>
   <process id="process5c08988" taskpriority="0" logused="1644" waitresource="KEY: 6:72057594098810880 (91a0638558d2)" waittime="4889" ownerId="24214248" transactionname="user_transaction" lasttranstarted="2011-05-17T03:29:15.327" XDES="0x186609470" lockMode="RangeI-N" schedulerid="9" kpid="9000" status="suspended" spid="102" sbid="0" ecid="0" priority="0" trancount="2" lastbatchstarted="2011-05-17T03:29:15.330" lastbatchcompleted="2011-05-17T03:29:15.330" clientapp=".Net SqlClient Data Provider" hostname="SOMEHOST" hostpid="28820" loginname="someloginname" isolationlevel="serializable (4)" xactid="24214248" currentdb="6" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="InsertIntoTheOneTable" line="25" stmtstart="1334" stmtend="2608" sqlhandle="0x03000600bbbacb5d25883f00d99e00000100000000000000">
INSERT INTO [dbo].[TheOneTable] (Some,Col,Here)
    VALUES (@some,@col,@here)     </frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 6 Object Id = 1573632699]    </inputbuf>
   </process>
  </process-list>
  <resource-list>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6b17a00" mode="RangeI-N" associatedObjectId="72057594098810880">
    <owner-list />
    <waiter-list>
     <waiter id="process722c508" mode="RangeS-S" requestType="wait" />
    </waiter-list>
   </keylock>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6b17a00" mode="RangeI-N" associatedObjectId="72057594098810880">
    <owner-list />
    <waiter-list>
     <waiter id="process7185048" mode="RangeS-S" requestType="wait" />
    </waiter-list>
   </keylock>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6b17a00" mode="RangeI-N" associatedObjectId="72057594098810880">
    <owner-list />
    <waiter-list>
     <waiter id="process7223048" mode="RangeS-S" requestType="wait" />
    </waiter-list>
   </keylock>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6b17a00" mode="RangeI-N" associatedObjectId="72057594098810880">
    <owner-list />
    <waiter-list>
     <waiter id="process6334088" mode="RangeS-S" requestType="wait" />
    </waiter-list>
   </keylock>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6b17a00" mode="RangeI-N" associatedObjectId="72057594098810880">
    <owner-list>
     <owner id="process5c08988" mode="RangeI-N" />
    </owner-list>
    <waiter-list>
     <waiter id="process8808e08" mode="RangeS-S" requestType="wait" />
    </waiter-list>
   </keylock>
   <keylock hobtid="72057594098810880" dbid="6" objectname="TheOneTable" indexname="PK_TheOneTable" id="lock6372e80" mode="RangeS-S" associatedObjectId="72057594098810880">
    <owner-list>
     <owner id="process7223048" mode="RangeS-S" />
     <owner id="process6334088" mode="RangeS-S" />
    </owner-list>
    <waiter-list>
     <waiter id="process5c08988" mode="RangeI-N" requestType="wait" />
    </waiter-list>
   </keylock>
  </resource-list>
 </deadlock>
</deadlock-list>

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世态炎凉 2024-11-15 15:17:12

在锁定的上下文中，表及其相关索引是单独的实体。有时，死锁发生在表及其索引之间，而不是发生在两个单独的表之间。

当在索引上获取锁，然后在相关表（即 bar）上获取另一个锁以进行数据查找时，最有可能出现此问题。在插入期间，这将以相反的顺序发生。首先，表（即条）被锁定并更新，然后索引被锁定。

select foo 
from bar 
where @someId = 0 OR SomeId = @someId

您是否有/可以添加包含 SomeId 和 foo 的覆盖索引（以帮助选择）？这样您就可以完全避免查找并阻止问题的发生。

您可以发布查询计划而不是死锁框架吗？

In the context of locking, tables and their related indexes are separate entities. At times, dead locking happens between a table and its index, rather than between two separate tables.

The problem is most likely when a lock is aquired on an index and then another lock is aquired on the related table (i.e. bar) to do the data lookup. During the insert, this will happen in the opposite order. First, the table (i.e. bar) is locked and updated, then indexes are locked.

select foo 
from bar 
where @someId = 0 OR SomeId = @someId

Do you have/can you add a covering index (to help with the select) that contains both the SomeId and foo ? This way you'll avoid the lookup altogether and stop the problem from occuring.

Can you post the query plans rather than deadlock frames?

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逆光飞翔i 2024-11-15 15:17:12

您介意尝试一些替代标准吗？我最近一直在使用这个方法（只是我使用 NULL 而不是 0 来表示所有值）：

SET @yId = NullIf(@yId, 0);
SET @xId = NullIf(@xId, 0);

...
WHERE
   @yId BETWEEN Coalesce(@yId, 0) AND Coalesce(@yId, 2147483647)
   AND @xId BETWEEN Coalesce(@xId, 0) AND Coalesce(@xId, 2147483647)

或者你可以完整地使用你的零：

WHERE
   @yId BETWEEN @yId AND Coalesce(NullIf(@yId, 0), 2147483647)
   AND @xId BETWEEN @xId AND Coalesce(NullIf(@xId, 0), 2147483647)

再考虑一下......只是为了回顾一下，死锁只会因为资源冲突而发生收购订单。资源不仅仅是表，还包括行、范围、页等。如果同时提交两个查询，最初获取较小粒度的锁，然后将它们的锁升级为与其他进程拥有的较小锁重叠的锁，那么你会陷入僵局。

那么，有什么方法可以让您更早地获取更大的锁，避免获取更大的冲突锁，或者更改资源获取顺序吗？

您可以尝试使用 WITH (TABLOCKX) 这听起来很糟糕，但如果您的 @yId 或 @xId 为 0 从而使您选择所有行，那么无论如何您都将需要整个表。

您是否也考虑过尝试 OPTION (MAXDOP 1) 只是看看它是否有帮助？理论上，同一数据请求具有多个流可能会增加同时获取冲突锁的可能性。

该表是否有聚集索引？如果没有，添加它，如果有，是正在使用还是可以强制使用？这可能会使查询以不同的方式访问表，从而防止死锁。

发表您的评论，我会看看是否会根据您的回复提出更多想法。

Would you mind trying some alternate criteria? I've been playing with this method lately (only I use NULLs not 0 to mean all values):

SET @yId = NullIf(@yId, 0);
SET @xId = NullIf(@xId, 0);

...
WHERE
   @yId BETWEEN Coalesce(@yId, 0) AND Coalesce(@yId, 2147483647)
   AND @xId BETWEEN Coalesce(@xId, 0) AND Coalesce(@xId, 2147483647)

Or you could use your zeroes intact:

WHERE
   @yId BETWEEN @yId AND Coalesce(NullIf(@yId, 0), 2147483647)
   AND @xId BETWEEN @xId AND Coalesce(NullIf(@xId, 0), 2147483647)

Thinking about this a little more... just to review, deadlocks only occur because of conflicting resource acquisition order. A resource is not just a table but rows, extents, pages, etc. If two queries are being submitted at once that initially acquire a smaller granularity lock, then escalate their locks to a something that overlaps the smaller lock the other process has, then you get a deadlock.

So, is there any way you can either acquire the larger lock earlier, avoid acquiring the larger conflicting lock, or change the resource acquisition order?

You could experiment with using WITH (TABLOCKX) which sounds horrible, but if your @yId or @xId is 0 thus making you select all rows, you're going to need the whole table anyway.

Have you also considered trying OPTION (MAXDOP 1) just to see if it helps? Theoretically, having multiple streams for the same data request could increase the likelihood of conflicting locks being acquired simultaneously.

Does the table have a clustered index? If not, add it, and if so, is it being used or can you force it to be used? This potentially could make the queries access the table in a different way, preventing the deadlock.

Post your comments and I'll see if any more ideas come up based on your responses.

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