How To Deal With Deadlocks ...
In a procedure that is called fairly frequently I access another server which from time to time decides that my procedure is "deadlock victim", and kills my process. What I would like to do is to check if this occurs, wait a second or two to allow SQL server to deal with the dealock, and try again until I get my statements run. Now this is impossible (to my knowledge) without using a separate process (i.e using a dll or something to make the call). Is there a way you could do this in standard T-SQL?
Btw, 1205 is the code returned by TSQL when a process is judged to be a deadlock victim.
To examplify my problem, consider this pseudo-code which illustrates the above way of thinking:
create procedure ProcName
as
declare
@ReturnCode int,
@Parameter1 varchar(10),
@Parameter2 varchar(10)
select @Parameter1 = SomeThing, @Parameter2 = SomeOtherThing
set @ReturnCode = 1205
while @ReturnCode = 1205
begin
exec @ReturnCode = master..<DLL-NameGoesHere> @Parameter1, @Parameter2
Waitfor delay '00:00:01'
end
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We've found deadlocks in the trace file that were not captured by ourPowerbuilder application. Some deadlocks are trapped or, at least,reported to the user as a db error, and others are completely silent.We've also seen evidence of strange data that would be explained byunprocessed deadlocks, although we've not yet proven that theunreported deadlocks are killing updates to the db.Putting a raiserror into various parts of the same code (and codereview) appears to prove that we are error checking after each dbupdate. That is, it looks like we're checking, and a raiserror alwaysbubbles up to the app.Can anyone shed some light on a.) How this could happen and b.) WhatShould We Do?Some of one of the traces below (with minor anotations.ThanksDeadlock encountered .... Printing deadlock information2004-11-11 10:33:57.77 spid42004-11-11 10:33:57.77 spid4 Wait-for graph2004-11-11 10:33:57.77 spid42004-11-11 10:33:57.77 spid4 Node:12004-11-11 10:33:57.77 spid4 TAB: 6:1739869265 (cbo1023p) []CleanCnt:2 Mode: X Flags: 0x02004-11-11 10:33:57.77 spid4 Wait List:2004-11-11 10:33:57.77 spid4 Owner:0x60e085e0 Mode: ISFlg:0x0 Ref:1 Life:00000000 SPID:88 ECID:02004-11-11 10:33:57.77 spid4 SPID: 88 ECID: 0 Statement Type:SELECT Line #: 1232004-11-11 10:33:57.77 spid4 Input Buf: Language Event: selectcbord.cbo1000p_item.longname as itemname,cbord.cbo4002p_itemevent.eventdate,cbord.cbo4002p_itemevent.eventstatus,cbord.cbo4002p_itemevent.unitid,cbord.cbo4004p_eventlist.itembin_intid,cbord.cbo4004p_eventlist.itemu2004-11-11 10:33:57.77 spid4 Requested By:2004-11-11 10:33:57.77 spid4 ResType:LockOwner Stype:'OR' Mode:IS SPID:84 ECID:0 Ec:(0x4F9B3A00) Value:0x4a0e9400 Cost:(0/0)2004-11-11 10:33:57.77 spid42004-11-11 10:33:57.77 spid4 Node:22004-11-11 10:33:57.77 spid4 TAB: 6:1739869265 (cbo1023p) []CleanCnt:2 Mode: X Flags: 0x02004-11-11 10:33:57.77 spid4 Grant List 2::2004-11-11 10:33:57.77 spid4 Owner:0x4de9a8a0 Mode: XFlg:0x0 Ref:742 Life:02000000 SPID:121 ECID:02004-11-11 10:33:57.77 spid4 SPID: 121 ECID: 0 Statement Type:UPDATE Line #: 142004-11-11 10:33:57.77 spid4 Input Buf: RPC Event:cbord.p_pur002_replacecost;12004-11-11 10:33:57.77 spid4 Requested By:2004-11-11 10:33:57.77 spid4 ResType:LockOwner Stype:'OR' Mode:IS SPID:88 ECID:0 Ec:(0x4F259A70) Value:0x60e085e0 Cost:(0/0)2004-11-11 10:33:57.77 spid42004-11-11 10:33:57.77 spid4 Node:32004-11-11 10:33:57.77 spid4 KEY: 6:2134298663 (cbo1000p_item):1(96006e2bf95f) CleanCnt:1 Mode: U Flags: 0x02004-11-11 10:33:57.77 spid4 Grant List 2::2004-11-11 10:33:57.77 spid4 Grant List 3::2004-11-11 10:33:57.77 spid4 Owner:0x4dc088a0 Mode: SFlg:0x0 Ref:1 Life:00000000 SPID:84 ECID:02004-11-11 10:33:57.77 spid4 SPID: 84 ECID: 0 Statement Type:CONDITIONAL Line #: 632004-11-11 10:33:57.77 spid4 Input Buf: Language Event: selectcbord.cbo1000p_item.longname as itemname,cbord.cbo4002p_itemevent.eventdate,cbord.cbo4002p_itemevent.eventstatus,cbord.cbo4002p_itemevent.unitid,cbord.cbo4004p_eventlist.itembin_intid,cbord.cbo4004p_eventlist.itemu2004-11-11 10:33:57.77 spid4 Requested By:2004-11-11 10:33:57.77 spid4 ResType:LockOwner Stype:'OR' Mode:X SPID:121 ECID:0 Ec:(0x5F719A70) Value:0x48286aa0 Cost:(0/B9654)2004-11-11 10:33:57.77 spid4 Victim Resource Owner:2004-11-11 10:33:57.77 spid4 ResType:LockOwner Stype:'OR' Mode:IS SPID:88 ECID:0 Ec:(0x4F259A70) Value:0x60e085e0 Cost:(0/0)2004-11-11 10:34:02.77 spid4
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Troubleshooting Deadlocks
Lock:Deadlock Chain Exchange 1 16325 2006-04-21 09:20:18.560 Parallel query worker thread was involved in a deadlock 0 Is the process I am running deadlocking with Exchange Server? The data above is from Profiler. Thanks Lystra
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How To Avoid Deadlocks
I am conducting stress testing for my website and keep getting deadlocks with the following message when one process is adding about 100 records per second and another process is trying to access the data: Transaction (Process ID 499) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction. What do I need to do in my stored procedures to avoid this? I only have ONE stored prcoedure that locks a row while incrementing an ID value. I am not doing any other locks, so is this a SQL Server system lock? Any advise would be much appreciated. Thanks!
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! SQL Server 6.5 Deadlocks !
I need some help in reducing deadlocks in 6.5 I have tested with `Insert Row Locking` turned off and it reduced the number of deadlocks. What i need to know is if removing the foreign key relationships on tables reduces/eliminates Deadlocks. If any of you have any info on this please let me know. Thanks Kalyan
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TRACKER
