哈希冲突引起的死锁？

时间：2012-10-14 04:23:12

标签： sql sql-server database deadlock database-deadlocks

我有一个死锁，它通过两个不同的进程ID在同一聚簇索引上发生排他锁。数据库处于RCSI模式。我有两个问题。

1）除了两个UPDATE语句重叠行之外，这可能是由哈希冲突造成的吗？

2）在下面的跟踪XML文件中，查询上有参数。我应该使用SQL事件探查器跟踪哪些事件来获取参数值？

感谢帮助。感谢

跟踪XML文件

<deadlock-list>
 <deadlock victim="process8ad948">
  <process-list>
   <process id="process8ad948" taskpriority="0" logused="164520" waitresource="KEY: 7:72057601661599744 (01c1926aca97)" waittime="2833" ownerId="7491036" transactionname="user_transaction" lasttranstarted="2012-10-08T13:16:03.067" XDES="0x6b561b950" lockMode="U" schedulerid="4" kpid="2476" status="suspended" spid="94" sbid="0" ecid="0" priority="0" trancount="2" lastbatchstarted="2012-10-08T13:16:57.753" lastbatchcompleted="2012-10-08T13:16:57.750" clientapp="PeopleSoft" hostname="STGAAMY-PPSAPP" hostpid="31772" loginname="HRTRNADM" isolationlevel="read committed (2)" xactid="7491036" currentdb="7" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056">
    <executionStack>
     <frame procname="adhoc" line="1" stmtstart="440" sqlhandle="0x020000007b8741293b8e4d6542633962bc48489d3946a5d1">
UPDATE PS_GP_NEW_RTO_WRK SET ORIG_CAL_RUN_ID = (SELECT DISTINCT C.ORIG_CAL_RUN_ID FROM PS_GP_PYE_PRC_STAT B ,PS_GP_OLD_RTO_WRK C WHERE C.EMPLID BETWEEN @P1 AND @P2 AND C.CAL_RUN_ID=@P3 AND C.EMPLID = PS_GP_NEW_RTO_WRK.EMPLID AND C.CAL_RUN_ID = PS_GP_NEW_RTO_WRK.CAL_RUN_ID AND C.EMPL_RCD = PS_GP_NEW_RTO_WRK.EMPL_RCD AND C.CAL_ID = PS_GP_NEW_RTO_WRK.CAL_ID AND C.GP_PAYGROUP = PS_GP_NEW_RTO_WRK.GP_PAYGROUP AND B.CAL_ID= C.CAL_ID AND B.GP_PAYGROUP= C.GP_PAYGROUP AND B.EMPLID=C.EMPLID AND B.EMPL_RCD=C.EMPL_RCD AND B.ORIG_CAL_RUN_ID=C.ORIG_CAL_RUN_ID AND C.SEL_ACTION IN (N&apos;R&apos;,N&apos;Z&apos;) AND B.SEL_ACTION=N&apos;A&apos;) WHERE EMPLID BETWEEN @P4 AND @P5 AND CAL_RUN_ID=@P6 AND (N&apos;N&apos;=@P7 OR EMPLID IN (SELECT EMPLID FROM PS_GP_GRP_LIST_RUN WHERE RUN_CNTL_ID=@P8 AND OPRID=@P9) ) AND EXISTS (SELECT B.ORIG_CAL_RUN_ID FROM PS_GP_PYE_PRC_STAT B ,PS_GP_OLD_RTO_WRK C WHERE C.EMPLID BETWEEN @P10 AND @P11 AND C.CAL_RUN_ID=@P12 AND C.EMPLID = PS_GP_NEW_RTO_WRK.EMPLID AND C.CAL_RUN_ID = PS_GP_NEW_RTO_WRK.CAL_RUN_ID AND C.EMPL_RCD = PS_GP_NEW_RTO     </frame>
     <frame procname="unknown" line="1" sqlhandle="0x000000000000000000000000000000000000000000000000">
unknown     </frame>
    </executionStack>
    <inputbuf>
(@P1 nvarchar(508),@P2 nvarchar(508),@P3 nvarchar(508),@P4 nvarchar(508),@P5 nvarchar(508),@P6 nvarchar(508),@P7 nvarchar(508),@P8 nvarchar(508),@P9 nvarchar(508),@P10 nvarchar(508),@P11 nvarchar(508),@P12 nvarchar(508))UPDATE PS_GP_NEW_RTO_WRK SET ORIG_CAL_RUN_ID = (SELECT DISTINCT C.ORIG_CAL_RUN_ID FROM PS_GP_PYE_PRC_STAT B ,PS_GP_OLD_RTO_WRK C WHERE C.EMPLID BETWEEN @P1 AND @P2 AND C.CAL_RUN_ID=@P3 AND C.EMPLID = PS_GP_NEW_RTO_WRK.EMPLID AND C.CAL_RUN_ID = PS_GP_NEW_RTO_WRK.CAL_RUN_ID AND C.EMPL_RCD = PS_GP_NEW_RTO_WRK.EMPL_RCD AND C.CAL_ID = PS_GP_NEW_RTO_WRK.CAL_ID AND C.GP_PAYGROUP = PS_GP_NEW_RTO_WRK.GP_PAYGROUP AND B.CAL_ID= C.CAL_ID AND B.GP_PAYGROUP= C.GP_PAYGROUP AND B.EMPLID=C.EMPLID AND B.EMPL_RCD=C.EMPL_RCD AND B.ORIG_CAL_RUN_ID=C.ORIG_CAL_RUN_ID AND C.SEL_ACTION IN (N&apos;R&apos;,N&apos;Z&apos;) AND B.SEL_ACTION=N&apos;A&apos;) WHERE EMPLID BETWEEN @P4 AND @P5 AND CAL_RUN_ID=@P6 AND (N&apos;N&apos;=@P7 OR EMPLID IN (SELECT EMPLID FROM PS_GP_GRP_LIST_RUN WHERE RUN_CNTL_ID=@P8 AND OPRID=@P9) ) AND EXISTS (SELECT B.ORIG_CAL_RUN_ID FRO    </inputbuf>
   </process>
   <process id="process5ff948" taskpriority="0" logused="2793096" waitresource="KEY: 7:72057601661599744 (9e1bb6c02ace)" waittime="1659" ownerId="7509883" transactionname="user_transaction" lasttranstarted="2012-10-08T13:16:50.867" XDES="0x6b6beb950" lockMode="U" schedulerid="1" kpid="2472" status="suspended" spid="95" sbid="0" ecid="0" priority="0" trancount="2" lastbatchstarted="2012-10-08T13:16:59.400" lastbatchcompleted="2012-10-08T13:16:59.400" clientapp="PeopleSoft" hostname="STGAAMY-PPSAPP" hostpid="32912" loginname="HRTRNADM" isolationlevel="read committed (2)" xactid="7509883" currentdb="7" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056">
    <executionStack>
     <frame procname="adhoc" line="1" stmtstart="440" sqlhandle="0x020000007b8741293b8e4d6542633962bc48489d3946a5d1">
UPDATE PS_GP_NEW_RTO_WRK SET ORIG_CAL_RUN_ID = (SELECT DISTINCT C.ORIG_CAL_RUN_ID FROM PS_GP_PYE_PRC_STAT B ,PS_GP_OLD_RTO_WRK C WHERE C.EMPLID BETWEEN @P1 AND @P2 AND C.CAL_RUN_ID=@P3 AND C.EMPLID = PS_GP_NEW_RTO_WRK.EMPLID AND C.CAL_RUN_ID = PS_GP_NEW_RTO_WRK.CAL_RUN_ID AND C.EMPL_RCD = PS_GP_NEW_RTO_WRK.EMPL_RCD AND C.CAL_ID = PS_GP_NEW_RTO_WRK.CAL_ID AND C.GP_PAYGROUP = PS_GP_NEW_RTO_WRK.GP_PAYGROUP AND B.CAL_ID= C.CAL_ID AND B.GP_PAYGROUP= C.GP_PAYGROUP AND B.EMPLID=C.EMPLID AND B.EMPL_RCD=C.EMPL_RCD AND B.ORIG_CAL_RUN_ID=C.ORIG_CAL_RUN_ID AND C.SEL_ACTION IN (N&apos;R&apos;,N&apos;Z&apos;) AND B.SEL_ACTION=N&apos;A&apos;) WHERE EMPLID BETWEEN @P4 AND @P5 AND CAL_RUN_ID=@P6 AND (N&apos;N&apos;=@P7 OR EMPLID IN (SELECT EMPLID FROM PS_GP_GRP_LIST_RUN WHERE RUN_CNTL_ID=@P8 AND OPRID=@P9) ) AND EXISTS (SELECT B.ORIG_CAL_RUN_ID FROM PS_GP_PYE_PRC_STAT B ,PS_GP_OLD_RTO_WRK C WHERE C.EMPLID BETWEEN @P10 AND @P11 AND C.CAL_RUN_ID=@P12 AND C.EMPLID = PS_GP_NEW_RTO_WRK.EMPLID AND C.CAL_RUN_ID = PS_GP_NEW_RTO_WRK.CAL_RUN_ID AND C.EMPL_RCD = PS_GP_NEW_RTO     </frame>
     <frame procname="unknown" line="1" sqlhandle="0x000000000000000000000000000000000000000000000000">
unknown     </frame>
    </executionStack>
    <inputbuf>
(@P1 nvarchar(508),@P2 nvarchar(508),@P3 nvarchar(508),@P4 nvarchar(508),@P5 nvarchar(508),@P6 nvarchar(508),@P7 nvarchar(508),@P8 nvarchar(508),@P9 nvarchar(508),@P10 nvarchar(508),@P11 nvarchar(508),@P12 nvarchar(508))UPDATE PS_GP_NEW_RTO_WRK SET ORIG_CAL_RUN_ID = (SELECT DISTINCT C.ORIG_CAL_RUN_ID FROM PS_GP_PYE_PRC_STAT B ,PS_GP_OLD_RTO_WRK C WHERE C.EMPLID BETWEEN @P1 AND @P2 AND C.CAL_RUN_ID=@P3 AND C.EMPLID = PS_GP_NEW_RTO_WRK.EMPLID AND C.CAL_RUN_ID = PS_GP_NEW_RTO_WRK.CAL_RUN_ID AND C.EMPL_RCD = PS_GP_NEW_RTO_WRK.EMPL_RCD AND C.CAL_ID = PS_GP_NEW_RTO_WRK.CAL_ID AND C.GP_PAYGROUP = PS_GP_NEW_RTO_WRK.GP_PAYGROUP AND B.CAL_ID= C.CAL_ID AND B.GP_PAYGROUP= C.GP_PAYGROUP AND B.EMPLID=C.EMPLID AND B.EMPL_RCD=C.EMPL_RCD AND B.ORIG_CAL_RUN_ID=C.ORIG_CAL_RUN_ID AND C.SEL_ACTION IN (N&apos;R&apos;,N&apos;Z&apos;) AND B.SEL_ACTION=N&apos;A&apos;) WHERE EMPLID BETWEEN @P4 AND @P5 AND CAL_RUN_ID=@P6 AND (N&apos;N&apos;=@P7 OR EMPLID IN (SELECT EMPLID FROM PS_GP_GRP_LIST_RUN WHERE RUN_CNTL_ID=@P8 AND OPRID=@P9) ) AND EXISTS (SELECT B.ORIG_CAL_RUN_ID FRO    </inputbuf>
   </process>
  </process-list>
  <resource-list>
   <keylock hobtid="72057601661599744" dbid="7" objectname="HRTRN91.dbo.PS_GP_NEW_RTO_WRK" indexname="PS_GP_NEW_RTO_WRK" id="lock4991e6c00" mode="X" associatedObjectId="72057601661599744">
    <owner-list>
     <owner id="process5ff948" mode="X"/>
    </owner-list>
    <waiter-list>
     <waiter id="process8ad948" mode="U" requestType="wait"/>
    </waiter-list>
   </keylock>
   <keylock hobtid="72057601661599744" dbid="7" objectname="HRTRN91.dbo.PS_GP_NEW_RTO_WRK" indexname="PS_GP_NEW_RTO_WRK" id="lockdf24e800" mode="X" associatedObjectId="72057601661599744">
    <owner-list>
     <owner id="process8ad948" mode="X"/>
    </owner-list>
    <waiter-list>
     <waiter id="process5ff948" mode="U" requestType="wait"/>
    </waiter-list>
   </keylock>
  </resource-list>
 </deadlock>
</deadlock-list>

表格结构

CREATE TABLE [dbo].[PS_GP_NEW_RTO_WRK](
    [EMPLID] [nvarchar](11) NOT NULL,
    [CAL_RUN_ID] [nvarchar](18) NOT NULL,
    [EMPL_RCD] [smallint] NOT NULL,
    [GP_PAYGROUP] [nvarchar](10) NOT NULL,
    [CAL_ID] [nvarchar](18) NOT NULL,
    [ORIG_CAL_RUN_ID] [nvarchar](18) NOT NULL,
    [RSLT_VER_NUM] [smallint] NOT NULL,
    [RSLT_REV_NUM] [smallint] NOT NULL,
    [PRC_ORD_TS] [dbo].[PSDATETIME] NULL,
    [SEL_STAT] [nvarchar](1) NOT NULL,
    [SEL_RSN] [nvarchar](2) NOT NULL,
    [RTO_PRC_ID] [nvarchar](10) NOT NULL,
    [PYMT_DT] [dbo].[PSDATE] NULL,
    [PRC_BGN_DT] [dbo].[PSDATE] NULL,
    [PRC_END_DT] [dbo].[PSDATE] NULL
) ON [PRIMARY]

GO

ALTER TABLE [dbo].[PS_GP_NEW_RTO_WRK] SET (LOCK_ESCALATION = ENABLE)
GO

指数结构

CREATE UNIQUE CLUSTERED INDEX [PS_GP_NEW_RTO_WRK] ON [dbo].[PS_GP_NEW_RTO_WRK] 
(
    [EMPLID] ASC,
    [CAL_RUN_ID] ASC,
    [EMPL_RCD] ASC,
    [GP_PAYGROUP] ASC,
    [CAL_ID] ASC,
    [ORIG_CAL_RUN_ID] ASC
)
    WITH (PAD_INDEX  = OFF, 
    STATISTICS_NORECOMPUTE  = OFF, 
    SORT_IN_TEMPDB = OFF, 
    IGNORE_DUP_KEY = OFF, 
    DROP_EXISTING = OFF, 
    ONLINE = OFF, 
    ALLOW_ROW_LOCKS  = ON, 
    ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]

1 个答案:

答案 0 :(得分：3)

1）在开发/测试服务器上恢复备份并运行此查询：

SELECT *
FROM (
    SELECT [EMPLID],[CAL_RUN_ID],[EMPL_RCD],[GP_PAYGROUP],[CAL_ID],[ORIG_CAL_RUN_ID], %%lockres%% AS KeyLockID
    FROM [dbo].[PS_GP_NEW_RTO_WRK]
) x
WHERE x.KeyLockID IN ('(01c1926aca97)','(9e1bb6c02ace)')

(01c1926aca97)和(9e1bb6c02ace)值是“锁定ID”（请参阅​​/ deadlock-list / deadlock / process-list / process / @ waitresource值：KEY: 7:72057601661599744 (01c1926aca97)，{{1 }}）。 如果你得到3行或更多行，那么答案是肯定的。

2）另外，你可以检查差异。计划：

KEY: 7:72057601661599744 (9e1bb6c02ace)

如果你为每个UPDATE或（@ ...）UPDATE语句（例如一个串行计划和一个并行计划）得到不同的计划，那么这个事实就排除了最初的假设（哈希冲突）。

扩展评论 enter image description here

T = SPID94开始执行UPDATE语句（串行计划）

T + 1 = SPID95开始执行UPDATE语句（并行计划）

T + 2 = SPID94对行/键4进行X锁定

T + 3 = SPID95-thread1尝试对行/键4进行U锁定（已被SPID94锁定）。 此外，SPID95-thread2对行/键9进行X锁定。

T + 4 = SPID94尝试对行/键9进行U锁定（已被SPID95锁定）。

结论：SPID94在行/键4上有一个X锁，并在行/键9上请求U锁.SPID95在行/键9上有一个X锁，并在行/键4上请求U锁。所以，我们陷入僵局。

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