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奇怪的死锁 求解释

问题
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死锁的奇怪的地方:死锁设计到的表示heap表,但是对key发生死锁,但是对key进行等待,死锁设计到的hotbid,无法再sys.partitions查询到objectid
线索:表中delete的where 字段,参数化传进来使用的是nvarchar,但是表中却是使用varchar
死锁信息:
<deadlock-list> <deadlock> <victim-list> <victimProcess id="processd245288"/> </victim-list> <process-list> <process id="processd245288" taskpriority="0" logused="0" waitresource="KEY: 7:72057594592690176 (6630517ab975)" waittime="811" ownerId="9523151791" transactionname="user_transaction" lasttranstarted="2013-11-22T14:31:17.393" XDES="0x54aa7b950" lockMode="U" schedulerid="31" kpid="2752" status="suspended" spid="96" sbid="0" ecid="0" priority="0" trancount="2" lastbatchstarted="2013-11-22T14:31:17.393" lastbatchcompleted="2013-11-22T14:31:17.393" clientapp=".Net SqlClient Data Provider" hostname="WIN-D03SNI5P5VJ" hostpid="27716" loginname="tianyi" isolationlevel="read committed (2)" xactid="9523151791" currentdb="7" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056"> <executionStack> <frame procname="" line="1" stmtstart="52" sqlhandle="0x02000000daa8051aae1fa7d63016b7f92bff8cc79cd2601b"> </frame> <frame procname="" line="1" sqlhandle="0x000000000000000000000000000000000000000000000000"> </frame> </executionStack> <inputbuf> (@Name nvarchar(4000))delete from [a] where Uame=@Name </inputbuf> </process> <process id="processd2274c8" taskpriority="0" logused="896" waitresource="KEY: 7:72057594592690176 (7f24bf9871b5)" waittime="810" ownerId="9523151781" transactionname="user_transaction" lasttranstarted="2013-11-22T14:31:17.387" XDES="0x3c692b3c0" lockMode="X" schedulerid="28" kpid="18272" status="suspended" spid="136" sbid="0" ecid="0" priority="0" trancount="2" lastbatchstarted="2013-11-22T14:31:17.400" lastbatchcompleted="2013-11-22T14:31:17.397" clientapp=".Net SqlClient Data Provider" hostname="WIN-D03SNI5P5VJ" hostpid="27716" loginname="tianyi" isolationlevel="read committed (2)" xactid="9523151781" currentdb="7" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056"> <executionStack> <frame procname="" line="1" stmtstart="290" sqlhandle="0x020000003e2b5d0915ab458804135b710c76331b2acad94d"> </frame> <frame procname="" line="1" sqlhandle="0x000000000000000000000000000000000000000000000000"> </frame> </executionStack> <inputbuf> (@Time datetime,@ID int,@Gre int,@OerID int,@rID uniqueidentifier,@RUD nvarchar(4000),@Uame nvarchar(4000))INSERT INTO [a]([a],[CID],[rNe],[AddTime],[Gere],[RID],[OID]) VALUES(@ProduByUserID,@ClID,@Usame,@Adme,@Gee,@RD,@OID) </inputbuf> </process> </process-list> <resource-list> <keylock hobtid="72057594592690176" dbid="7" objectname="" indexname="" id="lock8c9066380" mode="X" associatedObjectId="72057594592690176"> <owner-list> <owner id="processd2274c8" mode="X"/> </owner-list> <waiter-list> <waiter id="processd245288" mode="U" requestType="wait"/> </waiter-list> </keylock> <keylock hobtid="72057594592690176" dbid="7" objectname="" indexname="" id="lock6d968ab80" mode="U" associatedObjectId="72057594592690176"> <owner-list> <owner id="processd245288" mode="U"/> </owner-list> <waiter-list> <waiter id="processd2274c8" mode="X" requestType="wait"/> </waiter-list> </keylock> </resource-list> </deadlock> </deadlock-list>
答案
全部回复
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SQLSERVER给出的一些有用信息
--牺牲者:victimProcess id="processd245288
--等待资源 有索引 waitresource="KEY: 7:72057594592690176 (6630517ab975)
--锁模式:lockMode="U"
--锁超时:lockTimeout="4294967295"
--当时执行的语句 <inputbuf> (@Name nvarchar(4000))delete from [a] where Uame=@Name </inputbuf>
--进程:spid="96"
--非牺牲者:process id="processd2274c8"
--等待资源 与牺牲者等待同一个资源 waitresource="KEY: 7:72057594592690176 (7f24bf9871b5)"
--锁模式:lockMode="X"
--进程:spid="136"
--锁超时:lockTimeout="4294967295"
--当时执行的sql语句: <inputbuf> (@Time datetime,@ID int,@Gre int,@OerID int,@rID uniqueidentifier,@RUD nvarchar(4000),@Uame nvarchar(4000))INSERT INTO [a]([a],[CID],[rNe],[AddTime],[Gere],[RID],[OID]) VALUES(@ProduByUserID,@ClID,@Usame,@Adme,@Gee,@RD,@OID) </inputbuf>
--索引id:hobtid="72057594592690176" associatedObjectId="72057594592690176"无论是聚集索引还是非聚集索引,想问一下LZ您建立索引时候的第一个字段是不是Usame字段
如果是聚集索引
插入记录的时候也需要用到索引的,因为需要按照索引字段的排序规则(升序/降序)去插入记录
LZ可以参考一下:聚集索引表插入数据和删除数据的方式是怎样的
如果是非聚集索引
SQLSERVER中的假脱机 万圣节问题 的那个小节
插入记录的时候需要将记录插入到非聚集索引页面,而插入记录到非聚集索引页面的时候也是要排序规则的(升序/降序)
删除记录也是需要到非聚集索引页面查找记录,然后删除对应的记录
不知道这样解释LZ明白不?