两个select语句之间的死锁

Question

我有两个死锁的SQL select语句.. 我的印象是选择不能相互僵持吗？

令人费解的是，查询在select语句中获取了页锁，索引是否会导致这种情况？

<deadlock-list>
 <deadlock victim="process1cf0ce928">
  <process-list>
   <process id="process1cf0ce928" taskpriority="0" logused="8580" waitresource="PAGE: 11:1:168082 " waittime="4116" ownerId="24335138" transactionname="user_transaction" lasttranstarted="2013-10-01T23:04:04.353" XDES="0x2aa2f8d28" lockMode="S" schedulerid="2" kpid="6356" status="suspended" spid="62" sbid="0" ecid="0" priority="0" trancount="1" lastbatchstarted="2013-10-01T23:04:06.907" lastbatchcompleted="2013-10-01T23:04:06.903" lastattention="1900-01-01T00:00:00.903" clientapp=".Net SqlClient Data Provider" hostname="******" hostpid="5892" loginname="*****" isolationlevel="read committed (2)" xactid="24335138" currentdb="11" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="DB.dbo.GetCommandById" line="22" stmtstart="1586" stmtend="1726" sqlhandle="0x03000b00edb44b1eebd677013da2000001000000000000000000000000000000000000000000000000000000">
SELECT Top 1 *
        FROM   [Commands]
        WHERE [Command_ID]  = @CmdId;     </frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 11 Object Id = 508277997]    </inputbuf>
   </process>
   <process id="process1caa24cf8" taskpriority="0" logused="9876" waitresource="PAGE: 11:1:168082 " waittime="4104" ownerId="24335088" transactionname="user_transaction" lasttranstarted="2013-10-01T23:04:04.180" XDES="0x24f9956a8" lockMode="S" schedulerid="2" kpid="3872" status="suspended" spid="52" sbid="0" ecid="0" priority="0" trancount="1" lastbatchstarted="2013-10-01T23:04:06.917" lastbatchcompleted="2013-10-01T23:04:06.903" lastattention="1900-01-01T00:00:00.903" clientapp=".Net SqlClient Data Provider" hostname="*****" hostpid="5892" loginname="*****" isolationlevel="read committed (2)" xactid="24335088" currentdb="11" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
    <executionStack>
     <frame procname="DB.dbo.GetCommandById" line="22" stmtstart="1586" stmtend="1726" sqlhandle="0x03000b00edb44b1eebd677013da2000001000000000000000000000000000000000000000000000000000000">
SELECT Top 1 *
        FROM   [Commands]
        WHERE [Command_ID]  = @CmdId;     </frame>
    </executionStack>
    <inputbuf>
Proc [Database Id = 11 Object Id = 508277997]    </inputbuf>
   </process>
  </process-list>
  <resource-list>
   <pagelock fileid="1" pageid="168082" dbid="11" subresource="FULL" objectname="DB.dbo.Commands" id="lock22626c880" mode="IX" associatedObjectId="72057795337322496">
    <owner-list>
     <owner id="process1caa24cf8" mode="IX"/>
     <owner id="process1caa24cf8" mode="S" requestType="convert"/>
    </owner-list>
    <waiter-list>
     <waiter id="process1cf0ce928" mode="S" requestType="convert"/>
    </waiter-list>
   </pagelock>
   <pagelock fileid="1" pageid="168082" dbid="11" subresource="FULL" objectname="DB.dbo.Commands" id="lock22626c880" mode="IX" associatedObjectId="72057795337322496">
    <owner-list>
     <owner id="process1cf0ce928" mode="IX"/>
     <owner id="process1cf0ce928" mode="S" requestType="convert"/>
    </owner-list>
    <waiter-list>
     <waiter id="process1caa24cf8" mode="S" requestType="convert"/>
    </waiter-list>
   </pagelock>
  </resource-list>
 </deadlock>
</deadlock-list>