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PORangeS-U and U locks at the same time and on the same resource
 

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    <p>I'm working with some stored procedure and deadlock situation.</p> <p>I've been using SQL Server Profiler and get some information about the deadlock from 'Deadlock graph' event in form of the .xdl file. Below content of that file.</p> <p>I've just cleared some informations about the statement.The statement marked as <code>&lt;executionStack&gt;</code> in the .xdl was something like this (for both processes the same statement):</p> <pre><code>SELECT SomeColumn, SomeColumn2 FROM SomeTable WITH (UPDLOCK) INNER JOIN SomeTable2 ON SomeTable.SomeTable2ID = SomeTable2.SomeTable2ID INNER JOIN SomeTable3 ON SomeTable2.SomeTable3ID = SomeTable3.SomeTable3ID WHERE SomeColumn = @Something AND SomeColumn2 = @Something2 </code></pre> <p>And the content of the .xdl file:</p> <pre><code>&lt;deadlock-list&gt; &lt;deadlock victim="processc19dc8"&gt; &lt;process-list&gt; &lt;process id="processc19dc8" taskpriority="0" logused="0" waitresource="KEY: 5:72057594042646528 (8194443284a0)" waittime="1541" ownerId="21923027" transactionname="user_transaction" lasttranstarted="2013-07-02T18:03:42.260" XDES="0x80051950" lockMode="RangeS-U" schedulerid="2" kpid="2712" status="suspended" spid="54" sbid="0" ecid="0" priority="0" trancount="1" lastbatchstarted="2013-07-02T18:03:42.260" lastbatchcompleted="2013-07-02T18:03:42.260" clientapp=".Net SqlClient Data Provider" hostname="XXX" hostpid="2148" loginname="XXX" isolationlevel="serializable (4)" xactid="21923027" currentdb="5" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056"&gt; ... &lt;/process&gt; &lt;process id="processc4d048" taskpriority="0" logused="0" waitresource="KEY: 5:72057594042646528 (a0c936a3c965)" waittime="1541" ownerId="21923023" transactionname="user_transaction" lasttranstarted="2013-07-02T18:03:42.260" XDES="0x80049800" lockMode="RangeS-U" schedulerid="4" kpid="2492" status="suspended" spid="53" sbid="0" ecid="0" priority="0" trancount="1" lastbatchstarted="2013-07-02T18:03:42.260" lastbatchcompleted="2013-07-02T18:03:42.260" clientapp=".Net SqlClient Data Provider" hostname="XXX" hostpid="2148" loginname="XXX" isolationlevel="serializable (4)" xactid="21923023" currentdb="5" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056"&gt; ... &lt;/process&gt; &lt;/process-list&gt; &lt;resource-list&gt; &lt;keylock hobtid="72057594042646528" dbid="5" objectname="dbo.SomeTable" indexname="PK_SomeTable" id="lock83d99200" mode="RangeS-U" associatedObjectId="72057594042646528"&gt; &lt;owner-list&gt; &lt;owner id="processc4d048" mode="RangeS-U"/&gt; &lt;/owner-list&gt; &lt;waiter-list&gt; &lt;waiter id="processc19dc8" mode="RangeS-U" requestType="wait"/&gt; &lt;/waiter-list&gt; &lt;/keylock&gt; &lt;keylock hobtid="72057594042646528" dbid="5" objectname="dbo.SomeTable" indexname="PK_SomeTable" id="lock89b52900" mode="U" associatedObjectId="72057594042646528"&gt; &lt;owner-list&gt; &lt;owner id="processc19dc8" mode="U"/&gt; &lt;/owner-list&gt; &lt;waiter-list&gt; &lt;waiter id="processc4d048" mode="RangeS-U" requestType="wait"/&gt; &lt;/waiter-list&gt; &lt;/keylock&gt; &lt;/resource-list&gt; &lt;/deadlock&gt; &lt;/deadlock-list&gt; </code></pre> <p>So it looks like the first process owns a resource with <code>mode=U</code>, and the second owns the same resource with <code>mode=RangeS-U</code>.</p> <p>How it is possible if these two modes are not compatible with each other (according to the <a href="http://msdn.microsoft.com/en-us/library/ms186396.aspx" rel="nofollow">compatibility matrix</a>)?</p>
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    1. USMateusz
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    1. COThey are not exactly the same resource. The locks are on two distinct keys, KEY: 5:72057594042646528 (8194443284a0) and KEY: 5:72057594042646528 (a0c936a3c965)
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      1. USRoji P Thomas
    2. COI've already changed the code of that stored procedure, so that the deadlock no longer occurs. But you're right, I did not notice that.
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      1. USMateusz
 

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