Question

DB Blocks

Asked by: Aanvik

Hi, I have this attached log as trace and I am not very sure how to make most out of it. Can someone please help me and explain the different sections?

<blocked-process-report monitorLoop="152400">
 <blocked-process>
  <process id="process30a5d38" taskpriority="0" logused="0" waitresource="KEY: 7:72057605597233152 (c60024702b9d)" waittime="32234" ownerId="1013173986" transactionname="DELETE" lasttranstarted="2009-11-02T12:15:49.567" XDES="0x4fdb3a80" lockMode="U" schedulerid="12" kpid="7172" status="suspended" spid="216" sbid="0" ecid="0" priority="0" transcount="2" lastbatchstarted="2009-11-02T12:15:49.567" lastbatchcompleted="2009-11-02T12:15:49.567" clientapp=".Net SqlClient Data Provider" hostname="OOTF1712" hostpid="5216" loginname="pUser" isolationlevel="read committed (2)" xactid="1013173986" currentdb="7" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
   <executionStack>
    <frame line="16" stmtstart="722" stmtend="940" sqlhandle="0x03000700393216574ee58d00899c00000100000000000000"/>
   </executionStack>
   <inputbuf>
Proc [Database Id = 7 Object Id = 1461072441]   </inputbuf>
  </process>
 </blocked-process>
 <blocking-process>
  <process status="suspended" waitresource="KEY: 7:72057605597233152 (c60024702b9d)" waittime="36718" spid="206" sbid="0" ecid="0" priority="0" transcount="2" lastbatchstarted="2009-11-02T12:15:45.080" lastbatchcompleted="2009-11-02T12:15:45.080" clientapp=".Net SqlClient Data Provider" hostname="OOTF1712" hostpid="8712" loginname="pUser" isolationlevel="read committed (2)" xactid="1013172417" currentdb="7" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056">
   <executionStack>
    <frame line="16" stmtstart="722" stmtend="940" sqlhandle="0x03000700393216574ee58d00899c00000100000000000000"/>
   </executionStack>
   <inputbuf>
Proc [Database Id = 7 Object Id = 1461072441]   </inputbuf>
  </process>
 </blocking-process>
</blocked-process-report>

                                  
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Asked On
2009-11-02 at 12:45:38ID24865132
Topic

SQL Server 2005

Participating Experts
1
Points
500
Comments
11

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Answers

 

by: aneeshattingalPosted on 2009-11-02 at 13:39:29ID: 25724043

this will return the query which causes the deadlock

select   object_name (1461072441) as objID,
             substring(qt.text,s.statement_start_offset/2,
                  (case when s.statement_end_offset = -1
                  then len(convert(nvarchar(max), qt.text)) * 2
                  else s.statement_end_offset end -s.statement_start_offset)/2)
            as "SQL statement"
            ,s.statement_start_offset
            ,s.statement_end_offset
            ,batch=qt.text
            ,qt.dbid
            ,qt.objectid
            ,s.execution_count
            ,s.total_worker_time
            ,s.total_elapsed_time
            ,s.total_logical_reads
            ,s.total_physical_reads
            ,s.total_logical_writes
from sys.dm_exec_query_stats s
cross apply sys.dm_exec_sql_text(s.sql_handle) as qt
where s.sql_handle = '0x03000700393216574ee58d00899c00000100000000000000'

 

by: AanvikPosted on 2009-11-02 at 14:12:42ID: 25724351

Hi, thx for the comments but its not returning any result... 0 result.

 

by: AanvikPosted on 2009-11-02 at 14:13:18ID: 25724356

The Object id is stored proc if i do Select Object_Name(object_id)

 

by: aneeshattingalPosted on 2009-11-02 at 14:17:36ID: 25724395

where did u run that , it should be ran on the server where u found the deadlock

 

by: AanvikPosted on 2009-11-02 at 14:32:41ID: 25724503

yes, I ran it on the same server.

 

by: AanvikPosted on 2009-11-02 at 14:36:03ID: 25724524

Also I can see that the issue is happening when we are running the transaction logs are running... Its not that its happening every day but whenever it's happening its on that interval.

 

by: AanvikPosted on 2009-11-02 at 14:36:54ID: 25724530

Message
New queries assigned to process on Node 0 have not been picked  up by a worker thread in the last 60 seconds. Blocking or long-running queries can contribute to this condition, and may degrade client response time.  Use the "max worker threads" configuration option to increase number  of allowable threads, or optimize current running queries.  SQL Process Utilization: 18%. System Idle: 80%.

Also see these error messages in Logs.

 

by: AanvikPosted on 2009-11-02 at 14:38:53ID: 25724545


SQL Server has encountered 8 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file [I:\PDB_TEMPDB_LOG\templog.LDF] in database [tempdb] (2).  The OS file handle is 0x00000744.  The offset of the latest long I/O is: 0x000000ad294e00


SQL Server has encountered 2 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file [I:\MSSQL2005\PROD\PROD_Log0522.ldf] in database [PROD] (7).  The OS file handle is 0x00000AB0.  The offset of the latest long I/O is: 0x000002639ed200

 

by: aneeshattingalPosted on 2009-11-02 at 15:19:57ID: 25724809

 

by: AanvikPosted on 2009-11-02 at 15:33:39ID: 25724903

yes. I see that and been to the document but I also see a lot of db blocks and that's what doesn't really make sense.

 

by: aneeshattingalPosted on 2009-11-02 at 15:53:51ID: 25725021

SELECT  L.request_session_id AS SPID,
        DB_NAME(L.resource_database_id) AS DatabaseName,
        O.Name AS LockedObjectName,
        P.object_id AS LockedObjectId,
        L.resource_type AS LockedResource,
        L.request_mode AS LockType,
        ST.text AS SqlStatementText,        
        ES.login_name AS LoginName,
        ES.host_name AS HostName,
        TST.is_user_transaction AS IsUserTransaction,
        AT.name AS TransactionName    
FROM    sys.dm_tran_locks L
        LEFT JOIN sys.partitions P ON P.hobt_id = L.resource_associated_entity_id
        LEFT JOIN sys.objects O ON O.object_id = P.object_id
        LEFT JOIN sys.dm_exec_sessions ES ON ES.session_id = L.request_session_id
        LEFT JOIN sys.dm_tran_session_transactions TST ON ES.session_id = TST.session_id
        LEFT JOIN sys.dm_tran_active_transactions AT ON TST.transaction_id = AT.transaction_id
        LEFT JOIN sys.dm_exec_requests ER ON AT.transaction_id = ER.transaction_id
        CROSS APPLY sys.dm_exec_sql_text(ER.sql_handle) AS ST
WHERE   resource_database_id = db_id()

20120131-EE-VQP-002

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