Deadlock Due To Transactions Within A Single SPID(syslockinfo Table)
Jun 4, 2007
I got a deadlock scenario and so I took a snap shot of the syslockinfo table. I found out an interesting scenario where the deadlock is because of two transactions within the same spid.
rsc_text rsc_bin rsc_valblk rsc_dbid rsc_indid rsc_objid rsc_type rsc_flag req_mode req_status req_refcnt req_cryrefcnt req_lifetime req_spid req_ecid req_ownertype req_transactionID req_transactionUOW
1:31840 0x00060200607C00000100000000000000 0x00000000000000000000000000000000 2 0 0 6 0 5 1 1 0 0 113 0 1 96462284 00000000-0000-0000-0000-000000000000
1:31840 0x00060200607C00000100000000000000 0x00000000000000000000000000000000 2 0 0 6 0 5 3 1 0 67108864 113 0 1 96594607 00000000-0000-0000-0000-000000000000
For the first one the lock was granted(transactionID:96462284)
but for the next one(transactionId:96594607) it was put in wait state and SQL server detected it as a deadlock.
I just wanted some clarifications.
1) what is the significance of req_transactionID column in syslockinfo table?
2) what is the relationship between req_transactionId column and spid column?
3) In case of nested transactions what will be the values of these 2 columns and what will be the relationship between them in that scenario?
4) In this case the deadlock is occurring while executing a SP(the nested level of calls go till 3rd level).
5) Will there be contention for locks between transactions within a single spid.
it is something like this:
sp_cache
sp_cache1
while
sp_cache2
end while
the deadlock occurred when executing sp_cache 2.
At that time there were only two transactionId values in the syslockinfo table for this spid,They were:
1) 96462284
2)96594607
If some body could please help me it would be really helpful for me.
Thanks in advance!!
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Jul 20, 2005
We have one user who enters a transaction and then does a single rowupdate (updates all columns but only one is changing - this is due tothe way our sql is generated in the application), at this pointanother user enter a transaction and tries to update the same row (heunderstandably has to sit and wait while he is blocked by the originaluser). The original user then updates the same row again – at thispoint the second user is chosen as a deadlock victim and killed. If Itry and recreate this with any other tables(or pubs) I get my expectedbehaviour of the original user just doing 2 successful updates and thesecond user then completing his update once the original user haseither committed his changes or rolled back. The query plan indicatesthat a drop and insert of the row is happening (this is not the casewith any other tables where we get our expected behaviour). This onlyhappens when the index is clustered - if we use a non-clustered indexit does not occur.Is this expected behaviour? it seems dangerous to me as the firstuser has not commited or rolled back his updates. It was onlyhighlighted by a fault in our application that caused the secondupdate to be executed.I have some thoughts about it being something to do with a row lockbeing relased due to a delete / insest of the row in the second update(we see this in the execution plan).....Any help much appreciated as I am struggling to get my head round howthe second user was ever able to get hold of the resource.
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Nov 1, 2007
When I do a data flow task like following, always blocking
1.get data from data source
2.conditional spit by column='Y' or 'N'
3.when column='Y' insert to table a
4 when column='N', ole db command, update table a
but when I run this package, I see there are some rows are 'Y', some rows are 'N',but they can't run together.
Why? I've took long time for the issues.
When I change this data flow to a data flow plus t-sql task, and change ole db command( update table a) to execute tsql task.
The issue can be solved. But I want to know why i can't put these in one data flow?
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Feb 20, 2003
How do COM+ transactions relate to SQL Server SPID?
I am trying to solve a deadlock issue. Using SQL trace, I find SPID 65 and 71 are trying to acquire resources that are locked by each other. But what I am confuse with is tasks performed by 65 are triggered by different transactions (same for 71). Should different COM+ transaction uses different SPID?
The entire COM+ application uses only one db login.
Please advice.
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Jul 16, 2015
We have control table which will be useful whether we need to start the job or not. If we are starting the Job we will make it to 1.
Below is the Table Structure.
Table Name    IN_USE_FG
CUST_D Â Â Â Â Â Â Â Â Â Â 0
PROD_D Â Â Â Â Â Â Â Â Â Â 0
GEO_D Â Â Â Â Â Â Â Â Â Â Â 0
DATE_D Â Â Â Â Â Â Â Â Â Â 0
Now we have different packages for 4 tables data loading. These 4 packages will start at a time. Before going to load the data we have to make the Flag to 1 and after that we have to load it. Because of this we have written Update statement to update the Value to 1 in respective Package.Â
Now we are getting dead lock because we are using same table at a same time. Because we are updating different records.Â
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Nov 1, 2007
Goofed up and ran an update query. It messed up all the data in a single table. I'm trying not to restore the table from a previous backup since the backup is more than 20 GB. It's going to take forever to restore it. Any advice would be much appreciated!
Thanks!
Charles.
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Mar 8, 2007
The deadlock victim occurred executing the line
DT3 = GetSQLTable("Select * from vw_RegsBeingMarked " & Where, cmd)NotesDisplay is the .aspx page
You can clearly see that no transaction was in use, so the deadlock should not have occurred as far as I am concerned (3rd time I seen something like this).
This happened on MS SQL 2005 SP1.
The other part of this deadlock was caused by a delete statement (which did have a transaction) deleting rows that may have formed part of this view but that should only resulted in a normal lock, not a deadlock.
I have included the complete code that was executed along with the error message for reference.Can anyone explain this?
Partial Class NotesDisplay
Inherits System.Web.UI.Page
Private mUserInfo As Database.UserInfo
Private mDb As Database
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim RegOccID As Integer = CInt(Request.QueryString(("RegOccID")))
Dim DT3 As Data.DataTable
Main.GetSession(Me.Page, mUserInfo, mDb)
DT3 = mDb.MatchingRegs(RegOccID)
Public Function MatchingRegs(ByVal RegOccID As Integer) As DataTable
Dim DT3 As Data.DataTable
DT3 = GetSQLTable("Select * from vw_RegsBeingMarked where RegOccID = " & RegOccID)
If DT3.Rows.Count = 0 Then
Throw New Exception("Reg occ not found")
End If
Dim Starts As Date
Dim Ends As Date
Dim Where As String
With DT3.Rows(0)
Starts = .Item("Starts")
Ends = .Item("Ends")
If .Item("Ends") Is DBNull.Value = False And .Item("RoomID") Is DBNull.Value = False And .Item("RegStaff") Is DBNull.Value = False Then
' Posible merge with other regs
Dim cmd As New Data.SqlClient.SqlCommand
cmd.Parameters.AddWithValue("@Starts", Starts)
cmd.Parameters.AddWithValue("@Ends", Ends)
Where = " Where RoomID = " & CInt(.Item("RoomID")) & " AND Starts = @Starts AND Ends = @Ends AND RegStaff = " & CInt(.Item("RegStaff")) & " AND RoomID2 "
If .Item("RoomID2") Is DBNull.Value Then
Where &= " is null"
Else
Where &= " = " & CInt(.Item("RoomID2"))
End If
DT3.Rows.Clear()
DT3 = GetSQLTable("Select * from vw_RegsBeingMarked " & Where, cmd)
End If
Return DT3
End With
End Function
Public Function GetSQLTable(ByVal SQLString As String, Optional ByRef Cmd As SqlCommand = Nothing) As DataTable
Dim myConn As SqlConnection
Dim LocalCon As Boolean = False
If Cmd IsNot Nothing AndAlso Cmd.Connection IsNot Nothing Then
myConn = Cmd.Connection
If SQLString = "" Then
SQLString = Cmd.CommandText
End If
Else
myConn = DBOpenSQLConnection(SqlConEnum.Timetables)
LocalCon = True
End If
Try
GetSQLTable = GetSQLTableInternal(SQLString, myConn, Cmd)
Catch ex As Exception
Throw
Finally
If LocalCon Then
DBCloseSQLConnection(myConn)
End If
End Try
End Function
Private Function GetSQLTableInternal(ByVal SQLString As String, ByRef myConn As SqlConnection, Optional ByRef Cmd As SqlCommand = Nothing, Optional ByRef Trans As SqlTransaction = Nothing) As DataTable
Dim mySQLCommand As SqlCommand
Dim mySQLAdaptor As SqlDataAdapter
If Cmd Is Nothing Then
mySQLCommand = New SqlCommand
Else
mySQLCommand = Cmd
End If
mySQLCommand.Transaction = Trans
mySQLAdaptor = New SqlDataAdapter(mySQLCommand)
mySQLCommand.Connection = myConn
mySQLCommand.CommandText = SQLString
GetSQLTableInternal = New DataTable
mySQLAdaptor.Fill(GetSQLTableInternal)
End Function
Screen shot of SQL profiler deadlock information (showing lock types etc)http://img299.imageshack.us/img299/9625/deadlockmb9.jpg
System.Data.SqlClient.SqlException: Transaction (Process ID 58) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
at System.Data.SqlClient.SqlDataReader.HasMoreRows()
at System.Data.SqlClient.SqlDataReader.ReadInternal(Boolean setTimeout)
at System.Data.SqlClient.SqlDataReader.Read()
at System.Data.Common.DataAdapter.FillLoadDataRow(SchemaMapping mapping)
at System.Data.Common.DataAdapter.FillFromReader(DataSet dataset, DataTable datatable, String srcTable, DataReaderContainer dataReader, Int32 startRecord, Int32 maxRecords, DataColumn parentChapterColumn, Object parentChapterValue)
at System.Data.Common.DataAdapter.Fill(DataTable[] dataTables, IDataReader dataReader, Int32 startRecord, Int32 maxRecords)
at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataTable dataTable)
at Database.GetSQLTableInternal(String SQLString, SqlConnection& myConn, SqlCommand& Cmd, SqlTransaction& Trans)
at Database.GetSQLTable(String SQLString, SqlCommand& Cmd)
at Database.MatchingRegs(Int32 RegOccID)
at NotesDisplay.Page_Load(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
********************
at System.Web.UI.Page.HandleError(Exception e)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at ASP.notesdisplay_aspx.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
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Oct 28, 2005
In SQL Server 2005, you must have the VIEW SERVER STATE permission in order to access sys.syslockinfo (http://msdn2.microsoft.com/en-us/library/ms189497).
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Nov 10, 2015
Is there a way to send out an email woth deadlock information (victim query, winner query, process id's and resources on which the deadlock occurred) as soon as a deadlock occurs in a database or at instance level?I currently has trace flag 1222 turned on. And also created an alert that send me an email whenever a deadlock occurs. but it just says that a deadlock occurred and I log into sql server error log and review the information.
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Apr 4, 2006
How can i combine my data in single row ? All data are in a single table sorted as employeeno, date
Code:
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1 10/30/2006 500
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2 10/25/2006 800
3 10/26/2006 900
4 10/28/2006 1000
4 11/01/2006 8000
Should Appear
Code:
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1 10/30/2006 500 11/30/2006 1000
2 10/25/2006 800
3 10/26/2006 900
4 10/28/2006 1000 11/01/2006 800
PLEASE HELP I REALLY NEED THE RIGHT QUERY FOR THIS OUTPUT.
THANKS IN ADVANCE
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May 7, 2007
Hi There
I am trying to troubleshoot deadlock issues.
The dead lock is with a RID.
Now from various links i have established that you have to use DBCC PAGE() with relevant info to get more information, i get back a object and index id, m_objid.
However i dont know how to get the tablename form here, msdn simply says that it is an allocation id not and actual table id, so how can i from here get to table information?
All i am trying to figure out is which table is affected fromt he RID dealock, but that does not seem to be a simple process.
Thanx
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Dec 29, 2005
I sometimes get the following error from an update statement in astored procedure:Transaction (Process ID 62) was deadlocked on thread | communicationbuffer resources with another process and has been chosen as thedeadlock victim. Rerun the transaction.The isolation level is READ UNCOMMITTED and there are no explicittransactions in the stored procedure. The update statement is asfollows:UPDATE PLSET PL.PL_SI_LAST_YEAR_AMOUNT = #tmpWorkPLPrior.PRIOR_AMOUNTFROM #tmpWorkPLPriorWHERE PL.COMPANY = @compAND PL.PLAN_YEAR = @yearAND PL.FORECAST_QUARTER = @qtrAND PL.VERSION_ID = @verAND PL.BUSINESS_UNIT_CODE = #tmpWorkPLPrior.BUSINESS_UNITAND PL.PROJECT_ID = #tmpWorkPLPrior.PROJECT_IDAND PL.BUDGET_CODE = #tmpWorkPLPrior.BUDGET_CODEAND PL.BUSINESS_UNIT_CODE <> 'G7'PL rows: 24,342,553PL rows - Filtered: 230,088#tmpWorkPLPrior rows: 3,641Updated rows: 43,692The temp table (#tmpWorkPLPrior) is created by a SELECT INTO statement.It has the values that need to be set in the PL table. The PL tablehas a clustered index on 8 columns. The filters (@comp, @year, ...)select 230,088 rows. When the update succeeds it updates 43,692 rowsin about 15 seconds. Why does this sometimes deadlock and other timessucceed? There is nothing else running, so the process is deadlockingon itself.Thanks,Frank
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Oct 16, 2007
Hi,
We wrote some stored procedures, and some temporary table used because there some some complicated logic.
In normal testing, the application works weel, but very easy to get deadlock error in stress testing.
Error message like this:
Transaction (Process ID 51) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
Sample code:
CREATE TABLE #PageIndexForUsers
(
IndexId int IDENTITY (0, 1) NOT NULL,
UserId int
)
INSERT INTO #PageIndexForUsers (UserId)
SELECT USER_ID
FROM Users
Other tested functions will insert/update table Users too.
I searched on internet, several people said it's MS bug, anybody help?
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Jul 23, 2005
I want to set an alert for a specific table whenever an event hascaused a deadlock to occur on the table.I understand how to set up an alert. But I don't know which errornumber to use for the New Alert error number property for a deadlock.Or how to specify a deadlock on a specific table.Thanks,DW
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Nov 3, 2015
I am getting a number of deadlocks when inserting and deleting items from the same table.
The delete statement has a U lock and awaiting an IX lock on an index that covers the column in the where clause.
The insert statement has a IX lock and awaiting a U lock on the same index.
The delete statement is deleting about 5000 rows, where as the insert statement is inserting a single row.
Both these statements are found in stored procedures being called from LINQ to SQL.
I am wondering if there is a way I can prevent the delete statement taking the U lock out?My thinking being if the delete didn't take out the U lock then it would not deadlock with the insert. Are there any hints I could use to avoid the particular lock above?
I have seen various examples of multiple updates causing a deadlock, which can be fixed by adding multiple indexes. However, as I am inserting and deleting rows I imagine that all the indexes will need to be updated by both operations.
I have inherited the architecture and don't have the time to redesign everything at present. My backup plan is to deprioritize the delete and build in a retry mechanism.
However, it would be really good if I could find a more elegant way to handle deleting and inserting rows at the same time.
Deadlock trace information below...
11/02/2015 22:21:26,spid21s,Unknown,waiter id=process1cc9c68558 mode=IX requestType=wait
11/02/2015 22:21:26,spid21s,Unknown,waiter-list
11/02/2015 22:21:26,spid21s,Unknown,owner id=process203f31b498 mode=U
11/02/2015 22:21:26,spid21s,Unknown,owner-list
11/02/2015 22:21:26,spid21s,Unknown,pagelock fileid=1 pageid=721673 dbid=6 subresource=FULL objectname=PerforceReports_Staging.dbo.DebugReport id=lock1663f5d900 mode=U
[Code] ....
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Feb 21, 2007
I have a source table which I'm splitting 3 ways based on a column value, but the target is the same OLE DB destination table. One conditional path is to a Multi-Cast two way split to same OLE DB gestination table. The default split is to a flat file for logging unknown record types. For a test I have data for only the 3 column values I want, but I'm having trouble with the process completing. If I pre-filter the data going into the source table by one or two values I can get the process to complete even if one split is to the multicast. If I include all three data types in the source table, I get different results depending on the order in which the conditions are specified - sometimes only two split paths are executed; other times all three are executed, but in some cases only one path of the multicast split is executed. In any case, when the three source data types are used in the test, the process never competes - the pathes are in a yellow condition and never complete.
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Jan 27, 2007
I have some problems getting my SSIS package to run in a transaction, I wonder if anyone can assist.
What I want to do is run one package, which consists of a
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- 3) copy (only new) from staging table to real table
- 4) drop the staging table
I changed the package to "require" a transactions, and left all containers in it to "supported" (default, I think). I left all the transaction type to default "serializeable".
The package does not work, since the table I created on step one is not "seen" when step 2 wants to insert into it. If I set the package transaction back to "supported" (default) the package works, but an error on step 2 or 3 will not rollback changes and not remove the staging tables...
So, my question really is: How do I make step 1 results visible to step 2 in the same transaction? Or do I need to take a completly different approach for this?
Stupid question I think, but I seem to not be able to find the right way to handle this situation...
Thanks for reading!
Ralf
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May 22, 2005
Hi there,
I have decided to move all my transaction handling from asp.net to stored procedures in a SQL Server 2000 database. I know the database is capable of rolling back the transactions just like myTransaction.Rollback() in asp.net. But what about exceptions? In asp.net, I am used to doing the following:
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Nov 7, 2007
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Jul 23, 2005
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May 22, 2007
Hi
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OledbDestinationConnection 's "retainsameconnection" property has been set to true.
I have added a Execute SQL Query task to "begin transaction".
second Execute SQL Query task to truncate a table. say table "A" . truncate table a(table does not exists in the database).
third to rollback a transactions if the second task fails.
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The Rollback transaction has no corresponding "Begin transaction".
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Feb 9, 2012
I'm trying to insert data into a table from two tables into a single table along with a hard coded value.
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Msg 512, Level 16, State 1, Line 1
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
The statement has been terminated.
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Nov 19, 2015
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Dec 13, 2005
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Mar 28, 2006
All,
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Apr 15, 2004
Hi,
Can I have more than one value for variable @@SPID during a connection?
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Thanks.
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May 18, 2004
Hi All,
Sql Server 7.
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Jun 19, 2008
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Dec 29, 2006
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Nov 1, 2007
I have table "Clients" who have associated records in table "Mailings"
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The closest I can get is below:
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