Question

当1个进程执行删除查询而2个进程进行select查询时，我遇到了密钥死锁。

经过一番调查后，我发现在进程2中使用select查询会发生额外的S Key锁定而且它没有被释放。即使在空桌子上也会发生这种额外的锁定下面我从空表中记录了日志示例

66 acquiring IS lock on OBJECT: 6:1614680850:0  (class bit0 ref1) result: OK

Process 66 acquiring IS lock on PAGE: 6:1:16596  (class bit0 ref1) result: OK

Process 66 acquiring S lock on KEY: 6:72057594126925824 (fca2a895105d) (class bit1000000 ref1) result: OK

Process 66 releasing lock on PAGE: 6:1:16596 

(0 row(s) affected)

(1 row(s) affected)
Process 66 releasing lock on OBJECT: 6:1614680850:0

此锁未释放，我猜是导致死锁的原因

锁定KEY：6：72057594126925824（fca2a895105d）（类bit1000000 ref1）出现并且不释放资源

除了可以提供帮助的重要说明：

锁定停止以重新创建重新创建关键索引
删除表格中的任何项目后会出现此锁定，并在每个选择查询中重现
表上的索引只是Id
issolation level is read commited

这是索引pk-404的防御：

CONSTRAINT [PK-404] PRIMARY KEY CLUSTERED 
(
[id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, 
IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = 
ON) ON [PRIMARY]

这是死锁xml：

<deadlock-list>
<deadlock victim="process42dfb48c8">
    <process-list>
        <process id="process42dfb48c8" taskpriority="0" logused="0" waitresource="KEY: 6:72057594123845632 (a0db81c60a00)" waittime="7738" ownerId="175339832" transactionname="user_transaction" lasttranstarted="2018-01-08T13:37:22.097" XDES="0x46fd24f20" lockMode="S" schedulerid="1" kpid="13560" status="suspended" spid="64" sbid="0" ecid="0" priority="0" trancount="1" lastbatchstarted="2018-01-08T13:37:22.100" lastbatchcompleted="2018-01-08T13:37:22.097" lastattention="1900-01-01T00:00:00.097" clientapp=".Net SqlClient Data Provider" hostname="CHARNIAUSKI" hostpid="25760" loginname="S-1-9-3-4196599067-1192152927-2838817951-2017651452" isolationlevel="read committed (2)" xactid="175339832" currentdb="6" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056">
                <frame procname="adhoc" line="1" stmtstart="1166" stmtend="6160" sqlhandle="0x020000004fb4de1aaf9674f427de347416278bb96066c87b0000000000000000000000000000000000000000">unknown         </frame>
                <frame procname="unknown" line="1" sqlhandle="0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000">unknown         </frame>
            </executionStack>
            <inputbuf>(@$t_perm_tp_0 nvarchar(7),@$t_perm_tp_1 nvarchar(12),@$t_iden_list_2 ntext,@$t_ip_addr_3 nvarchar(3),@$t_cur_user_id_4 char(32),@$t_pwarn_5 nvarchar(24),@$Crtr char(32),@$Mngr char(32),@$Ownr char(32),@SYNCHRONIZATION_STATUS_created_by_id_9 nvarchar(4),@$intCanGet int,@SYNCHRONIZATION_STATUS_current_state_11 nvarchar(16),@SYNCHRONIZATION_STATUS_destination_system_12 nvarchar(15),@SYNCHRONIZATION_STATUS_id_13 nvarchar(22),@SYNCHRONIZATION_STATUS_itemtype_id_14 nvarchar(8),@SYNCHRONIZATION_STATUS_locked_by_id_15 nvarchar(4),@SYNCHRONIZATION_STATUS_modified_by_id_16 nvarchar(4))SELECT  [SYNCHRONIZATION_STATUS].[CREATED_BY_ID] [CREATED_BY_ID], fk0.keyed_name AS created_by_id_$_keyed_name, @SYNCHRONIZATION_STATUS_created_by_id_9 AS created_by_id_$_type, @$intCanGet AS created_by_id_$_permission, [SYNCHRONIZATION_STATUS].[CREATED_ON] [CREATED_ON], [SYNCHRONIZATION_STATUS].[CSS] [CSS], [SYNCHRONIZATION_STATUS].[CURRENT_STATE] [CURRENT_STATE], fk1.keyed_name AS current_state_$_keyed_name, @SYNCHRONIZATION_        </inputbuf>
        </process>
        <process id="process4021d5088" taskpriority="0" logused="75192" waitresource="KEY: 6:72057594123845632 (34ae5dff07bc)" waittime="838" ownerId="175321005" transactionname="user_transaction" lasttranstarted="2018-01-08T13:37:20.910" XDES="0x46fec0f20" lockMode="X" schedulerid="2" kpid="5968" status="suspended" spid="69" sbid="0" ecid="0" priority="0" trancount="2" lastbatchstarted="2018-01-08T13:37:29.003" lastbatchcompleted="2018-01-08T13:37:29.003" lastattention="1900-01-01T00:00:00.003" clientapp=".Net SqlClient Data Provider" hostname="CHARNIAUSKI" hostpid="25760" loginname="S-1-9-3-4196599067-1192152927-2838817951-2017651452" isolationlevel="read committed (2)" xactid="175321005" currentdb="6" lockTimeout="4294967295" clientoption1="671088672" clientoption2="128056">
            <executionStack>
                <frame procname="adhoc" line="1" stmtstart="28" stmtend="136" sqlhandle="0x02000000a2bf4a1340bcb59dc4a28a98762fb48a43cbf6a00000000000000000000000000000000000000000">unknown         </frame>
                <frame procname="unknown" line="1" sqlhandle="0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000">unknown         </frame>
            </executionStack>
            <inputbuf>(@id char(32))DELETE FROM [SYNCHRONIZATION_STATUS] WHERE  [ID] = @id         </inputbuf>
        </process>
    </process-list>
    <resource-list>
        <keylock hobtid="72057594123845632" dbid="6" objectname="KHI-SP11-Rel-0103.SYNCHRONIZATION_STATUS" indexname="pk4044" id="lock3d7a81600" mode="X" associatedObjectId="72057594123845632">
            <owner-list>
                <owner id="process4021d5088" mode="X"/>
            </owner-list>
            <waiter-list>
                <waiter id="process42dfb48c8" mode="S" requestType="wait"/>
            </waiter-list>
        </keylock>
        <keylock hobtid="72057594123845632" dbid="6" objectname="KHI-SP11-Rel-0103.SYNCHRONIZATION_STATUS" indexname="pk4044" id="lock438cc6280" mode="S" associatedObjectId="72057594123845632">
            <owner-list>
                <owner id="process42dfb48c8" mode="S"/>
            </owner-list>
            <waiter-list>
                <waiter id="process4021d5088" mode="X" requestType="wait"/>
            </waiter-list>
        </keylock>
    </resource-list>
</deadlock>
</deadlock-list>

对KEY的S锁定未释放

0 个答案: