Deadlock Accessing Variables

May 15, 2007

I am trying to access a single variable in a script and a deadlock error continues to come up. I have a single string variable that is added to the readwritevariables collection in the editor. I am trying to execute the following code:



Dim variables As Variables

Try

Dts.VariableDispenser.LockForWrite("Test")

Dts.VariableDispenser.GetVariables(variables)

Catch ex As Exception

Throw ex

Finally

variables.Unlock()

End Try



I have installed Service Pack2 and this error continues. I know it has been posted on before and I appreciate any help.



Thanks

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A Deadlock Was Detected While Trying To Lock Variables

Mar 20, 2008



Hi Friends,

I have a problem to read varibale inside script.
the error discription is following-

Error: A deadlock was detected while trying to lock variables "User::FilePath" for read/write access. A lock cannot be acquired after 16 attempts. The locks timed out.



this is my code. i my code i am using two variables, but i can access only one .
i have to retrive file directory and file path is generated by other system.


Public Sub Main()

'

' Add your code here

'

Dim vars As Variables



If Not vars Is Nothing Then

vars.Unlock()

End If

Dim lFileName As String = String.Empty

Dim lFilePath As String = String.Empty

Dts.VariableDispenser.LockOneForWrite("FilePath", vars)

Dts.VariableDispenser.LockOneForRead("FileName", vars)

Dts.VariableDispenser.GetVariables(vars)

lFileName = vars.Item("FileName").Value.ToString

lFilePath = GetDirectoryName(lFileName)

If Not lFilePath.EndsWith("") Then

lFilePath = String.Format("{0}", lFilePath)

End If

vars("UnzippedKeyStatFilePath").Value = lFilePath

vars.Unlock()

Dts.TaskResult = Dts.Results.Success



End Sub

Thanks
Manish Jain

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Nov 21, 2006

Hi

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Hi,

Given that Task.Validate() exposes the package's VariableDispenser, but LogProviderBase.Validate() doesn't...

http://msdn2.microsoft.com/fr-fr/library/microsoft.sqlserver.dts.runtime.task.validate.aspx

http://msdn2.microsoft.com/fr-fr/library/microsoft.sqlserver.dts.runtime.logproviderbase.validate.aspx

...I guess that simply means that I can't access a package's variables within a custom log provider? Can anyone comment/confirm? Any other options/routes to achieving the same..?

We live in hope,

Tamim.

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Oct 1, 2007



As far as I can make out it is not possible to access the variables collection from a custom log provider.

I'm interested to know what the rationale for this is. Why aren't the variables available for logging purposes?

Thanks
Jamie

[Microsoft follow-up]

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Feb 6, 2008

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Hi,

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João





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Jan 24, 2006

Hi,

I would like to design a SSIS package, which have couple of variables. It loads a xls file specified in a variable [varExcelFileFullPath] .

I will run it by commands: exec xp_cmdshell 'dtexec /SQL ....' (pls see an example below).

It seems it does not get the values passed in for those variables. I deployed the package to a sql server.

are there any grammar errors here? I copied it from dtexecui. It worked inside Dtexecui not in dos command.

exec xp_cmdshell 'dtexec /SQL "LoadExcelDB" /SERVER test /USER *** /PASSWORD ****

/MAXCONCURRENT " -1 " /CHECKPOINTING OFF /REPORTING EW

/LOGGER "{6AA833A1-E4B2-4431-831B-DE695049DC61}";"Test.SuperBowl"

/Set Package.Variables[User::varExcelFileName].Properties[Value];"TestAdHocLayer"

/Set Package.Variables[User::varExcelWorkbookName].Value;"Sheet1$"

/Set Package.Variables[User::varExcelFileFullPath].Value;"D: estshareTestAdHocLayer.xls"

/Set Package.Variables[User::varDestinationTableName].Value;"FeaturesTmp"

/Set Package.Variables[User::varPreSQLAction].Value;"delete from FeaturesTmp"

'



thanks,



Guangming

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}catch (Exception e){Response.Write("Error 4: " + e.Message + ".<br><br>Please email abc@abc.com.<br><br>Thank you.");}finally{} }private void UpdateSummaryLogTable(string DownloadCount, string TotalFileSize , string Station_ID , string ContentFileName , string AdFileNameClause, string DownloadDate, SqlConnection MyConnection){string MyString = @"UPDATE tblSummaryLog SET DownloadCount = '" + DownloadCount + "', TotalFileSize = '" + TotalFileSize + "', DownloadDate = getdate() WHERE Station_ID = '" + Station_ID + "' AND ContentFileName = '" + ContentFileName + "' AND " + AdFileNameClause + " AND (CONVERT(CHAR(19), DownloadDate) = CONVERT(CHAR(19), CAST('" + DownloadDate + "' AS datetime)))";try{ SqlCommand MyCmd = new SqlCommand(MyString, MyConnection); MyCmd.CommandTimeout = 60;MyCmd.ExecuteNonQuery(); }catch (Exception e){Response.Write("Error 5: " + e.Message + ".<br><br>Please email abc@abc.com.<br><br>Thank you.");}finally{} }private void InsertSummaryLogTable(string Station_ID , string ContentFileName , string AdFileName , string TotalFileSize, SqlConnection MyConnection){string MyString = @"INSERT INTO tblSummaryLog ( Station_ID, ContentFileName, AdFileName, DownloadCount, TotalFileSize, DownloadDate ) VALUES ( '" + Station_ID + "', '" + ContentFileName + "', " + AdFileName + ", '1', '" + TotalFileSize + "', getdate() )";try{ SqlCommand MyCmd = new SqlCommand(MyString, MyConnection);MyCmd.CommandTimeout = 60;MyCmd.ExecuteNonQuery();}catch (Exception e){Response.Write("Error 6: " + e.Message + ".<br><br>Please email abc@abc.com.<br><br>Thank you.");}finally{} }

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Hi All

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I am unable to control the granularity of locks in our queries.
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Within the batch, I have given a table hint to set transaction isolation level
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and the same for the Select statement.

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Deadlock encountered .... Printing deadlock information
2002-11-04 14:34:26.33 spid4
2002-11-04 14:34:26.33 spid4 Wait-for graph
2002-11-04 14:34:26.33 spid4
2002-11-04 14:34:26.33 spid4 Node:1

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2002-11-04 14:34:26.33 spid4 Requested By:
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2002-11-04 14:34:26.33 spid4

2002-11-04 14:34:26.33 spid4 Node:2
2002-11-04 14:34:26.33 spid4 KEY: 11:1205683443:11 (df001773794a) CleanCnt:1 Mode: X Flags: 0x0

2002-11-04 14:34:26.33 spid4 Grant List::
2002-11-04 14:34:26.33 spid4 Owner:0x85147ee0 Mode: X Flg:0x0 Ref:0 Life:02000000 SPID:166 ECID:0

2002-11-04 14:34:26.33 spid4 SPID: 166 ECID: 0 Statement Type: SELECT INTO Line #: 44
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2002-11-04 14:34:26.33 spid4 Requested By:
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Thanks in advance,
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my mail id scraval@hotmail.com

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Hi

Sorry for bombading the forum with all these questions, but i am relatively new to sql 2000.

I am getting dead lock on the following procedure.

important background information
1. this is a multi user web-based call centre application
2. this procedure loads up a new contact based on priority

I see no reason how a dead lock could occur.
does any one have any idea. could it be something else that is locking up resource used by this procedure?


CREATE PROCEDURE topcat.getNewContactInfo
(
@contact_id int
)
AS
BEGIN
begin transaction

declare @id int

set @id = (SELECT TOP 1 _id FROM class_contact WHERE (status IS NULL OR status='New Contact' OR status = 'No Connect' OR status='callback') AND (checked_in IS NULL OR checked_in <> 1) AND (callback_date >= (getdate() + 1) OR callback_date IS NULL ) ORDER BY priority DESC)

UPDATE class_contact SET checked_in = 1 WHERE _id = @id
SELECT TOP 1 * FROM class_contact
WHERE _id = @id

commit
END
GO



wat i dont' get is that, this procedure only has one update statement, this is the only statement that could possibly hold a lock on another resource (i think) , i can't see how a dead lock can happen in this case since this procedure doesn't hold up 2 resources at a time.


James :(

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=============================
http://www.sqlserverstudy.com

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Deadlock Alert

Sep 4, 2002

I have set up an alert to detect when Page Deadlocks rise above 0. Overnight I have DTS packages populating SQL Server and various other jobs (Cognos Cube Builds etc.). My alert detected a Deadlock during the night but all of my processes completed fine. My problem/misunderstanding is that my alert is still popping up every 5 mins saying there is a Deadlock yet there is nothing running or no-one accessing SQL server and I cannot see any trace of the Deadlock in the Current Activity. Is this normal or is it a bug?

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Deadlock....URGENT

Feb 8, 2000

Hi,
Can I use the Create Trace Wizard to trace the cause for a deadlock....I have created a new Trace , so in the couse of today if I encounter a deadlock will I know....how is this indicated....Please do let me know as I am using this for the first time.....

Bindu

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Deadlock Logging

Nov 8, 2001

I have (amongst many) an overnight SQL stored procedure that occasionally takes over an hour to run compared to its usual 2 minutes. It does the same each night, as does everything around it. (N.B. The job truncates and reinserts data into a table.)

I'm just wondering if a user request during the day that reads the table perhaps leave the PID open and thus a lock open with it. Then, perhaps my SQL job comes along and waits for the lock to release before it performs the truncate.

Couple of questions:
1. Could this happen?
2. If so, is there a log anywhere to suggest that a deadlock situation arose and PID x was the loser?

Thx in advance.

Andy Richardson

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