How Can Readers Block Readers In SQL Server 2005

May 26, 2008

Hello All,
Greetings!!!

Due to certain constraints on my Table, I am not able to place unique Key constraint on it.
So I have take care about the uniqueness in my T-SQL code. I don't want to use the serializable transaction isolation level as it will result in frequent deadlocks.
I want some means by which one select will block other select.
Can this be done in SQL Server. I tried using TablockX along with holdlock as Table hint, but still the Selects does not block other select.
Will appreciate if you can resolve this issue

Thanks in Advance,
Mitesh Shah
MCTS- SQL Server 2005

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Readers Not Queued?

Jan 9, 2007

When multiple readers are waiting on a message from the same queue, I would expect that the reader that has been waiting the longest would be the first to pick up a message. However, I'm shocked to discover that the opposite seems to be true; in my tests I'm showing that the reader that has been waiting the least time picks up a message first! This seems totally counter-intuitive, and I'd like to know why it's working this way. This implementation will cause a lot more reader timeouts to occur than a properly queued method. For instance, assume that I have two readers, each using a one minute timeout. Reader #1 starts waiting, and reader #2 is busy for another 20 seconds before it starts waiting. 39 seconds later a message comes in and reader #2 will pick it up, leaving reader #1 to time out one second later! I would much rather have reader #1 pick up the message and reader #2 continue to wait for 20 more seconds.

I'm considering filing a bug on Connect about this, but I thought I'd post here first and see if I can get an answer...

Following is the script I'm using to test:

---Setup / Window #1---

--------------------------------------
CREATE DATABASE SimpleSSB
GO

USE SimpleSSB
GO

--Create a database master key
CREATE MASTER KEY
ENCRYPTION BY PASSWORD = 'onteuhoeu'
GO

--Create a message type
CREATE MESSAGE TYPE Simple_Msg
VALIDATION = EMPTY
GO

--Create a contract based on the message type
CREATE CONTRACT Simple_Contract
(Simple_Msg SENT BY INITIATOR)
GO

--create a queue
CREATE QUEUE Simple_Queue
GO

--Create a service
CREATE SERVICE Simple_Service
ON QUEUE Simple_Queue
(Simple_Contract)
GO
--------------------------------------

---Go start the other windows now---

---Readers: Windows #2-n ---

--------------------------------------
USE SimpleSSB
GO

WAITFOR
(
RECEIVE *
FROM Simple_Queue
), TIMEOUT 300000

--------------------------------------


---Start at least two readers, then do---
--------------------------------------

--send a message...
DECLARE @h UNIQUEIDENTIFIER

BEGIN DIALOG CONVERSATION @h
FROM SERVICE Simple_Service
TO SERVICE 'Simple_Service'
ON CONTRACT Simple_Contract
WITH ENCRYPTION=OFF;

SEND ON CONVERSATION @h
MESSAGE TYPE Simple_Msg
GO

--------------------------------------


... the last reader you've started will pick up the message first. Note I'm testing on 9.0.3033, in case that matters.

Thanks!

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Hello,
This is info that I am still not certain about and I just need to make sure, my gut feeling is correct:

A.
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1. Message is left on the Queue.
2. is the worker procedure triggered again for the same message by the queue?
3. I am hoping the Queue keeps on triggering workers until it is empty.

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B.
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[Code] ....

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thanks,

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Date format is: YYYY-MM-DD

Data:

TestId TestDate
----------- -----------------------
1 2011-07-21 00:00:00.000
1 2011-07-22 00:00:00.000
1 2011-07-27 00:00:00.000
1 2011-07-29 00:00:00.000
1 2011-07-30 00:00:00.000
1 2011-07-31 00:00:00.000

[Code] ....

My Attempt:

WITH cte AS
(
SELECTTestId,
TestDate,
ROW_NUMBER() OVER
(
PARTITION BYTestId

[Code] .....

Expected Output:

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----------- ----------------------- --------------------
1 2011-07-21 00:00:00.000 1
1 2011-07-22 00:00:00.000 1
1 2011-07-27 00:00:00.000 2
1 2011-07-29 00:00:00.000 3
1 2011-07-30 00:00:00.000 3

[Code] ....

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Mar 18, 2015

I want to assign consecutive numbers to a block of data, where block of data is based on days consecutive to each other i.e., one day apart.

Date format is: YYYY-MM-DD

Data:
TestId TestDate
----------- -----------------------
1 2011-07-21 00:00:00.000
1 2011-07-22 00:00:00.000
1 2011-07-27 00:00:00.000
1 2011-07-29 00:00:00.000
1 2011-07-30 00:00:00.000

[Code] ....

My Attempt:
WITH cte AS
(
SELECTTestId,
TestDate,
ROW_NUMBER() OVER(
PARTITION BYTestId

[Code] ....

Expected Output:
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----------- ----------------------- --------------------
1 2011-07-21 00:00:00.000 1
1 2011-07-22 00:00:00.000 1
1 2011-07-27 00:00:00.000 2
1 2011-07-29 00:00:00.000 3

[Code] ....

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Hi

This is the code which I have written in code window.

Public Shared Function CalcLocalFactor(ByVal CalcLifeCode As Integer, ByVal CalcFiscalAge As Integer, ByVal CalcLifeYearsUsed As Double, ByVal CalcLocConvention As String, ByVal CalcSRate As Integer) As Double
Dim locCalcFiscalAge As Integer = 0
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Dim locFactor1 As Double = 1.0
Dim REM1 As Integer = 1
Dim DEP As Double = 0
Dim YR As Integer
Dim HALF_YEAR As Double
Dim LINEAR As Double
Dim MACR As Double
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locCalcFiscalAge = 0
locFactor = 1.0
End If
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End If
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locFactor1 = 1
Exit For
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HALF_YEAR = 2
Else
HALF_YEAR = 1
End If
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If MACR >= LINEAR Then
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Else
DEP = LINEAR
End If
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locFactor = locFactor1
Next
End If
Return locFactor
End Function

I'm calling this code in a Report Parameter like below:

=Code.CalcLocalFactor(Parameters!CalcLifeCode.Value,Parameters!CalcFiscalAge.Value,Parameters!CalcLifeYearsUsed.Value,Parameters!CalcLifeYearsUsed.Value, Parameters!CalcSRate.Value )

It is working fine for the first record where as for other records, the value is not getting changed. i.e. the first records value is coming repeatedly for all other records also.

How can I dynamically change the parameter values of the function?

Parameter is not accepting directly the field names, hence I used other parameter to initialize the field and used that parameter for this.

Ex. Parameter Name ; FieldPurchDate (internal) FieldName : PURCHDATE
Other parameter: FieldInDate (internal) FieldName : InDate

While initializing the new parameter CalcPurchDate,, I used an expression for this: Parameters!CalcFiscalAge.Value

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These are some of the things , I am doing ....

Please let me know how to fix this issue...

Thanks in advance

Regards,

Radhika

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HI,
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Begin
begin try
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-- here we are inserting int value in identity field...
END TRY
Begin catch
PRINT 'TEST'
SELECT
ERROR_NUMBER() AS ErrorNumber,
ERROR_SEVERITY() AS ErrorSeverity,
ERROR_STATE() as ErrorState,
ERROR_PROCEDURE() as ErrorProcedure,
ERROR_LINE() as ErrorLine,
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END Catch
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Whereas the following block works fine and the Catch block executes.

Begin
begin try
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END TRY
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Hi to everybody,

i have this problem.

sometimes a process in my SQL Server 2005 (upd 2) is blocked from itself. If I find in monitor it wait for a lock_M_Sch_M on a temporary table as you can see from

select * from sys.dm_tran_locks where request_session_id=51 and request_status <> 'GRANT'



resorce type : OBJECT

resource id : 218899226

request mode : Sch-M

request status WAIT

request_session id : 51

request life time : 33554432



or from

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resource address : 0x0000000201C71300

blocking task address : 0x0000000000C2F198

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Luca







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Hi:

one of our study group members noticed a strange behavior and has the following question. Any thoughts are appreciated.
I am unable to understand as to why the CATCH block is not executed when an INSERT is made
On table T3 which is dropped after the first transaction.

The severity of Insert into t3 values (3) is Msg 208, Level 16, State 1, Line 2
Invalid object name 't3'.

BOL says TRY€¦CATCH constructs do not trap the following conditions:
Warnings or informational messages with a severity of 10 or lower.
Errors with severity of 20 or higher that terminate the SQL Server Database Engine task processing for the session. If an error occurs with severity of 20 or higher and the database connection is not disrupted, TRY€¦CATCH will handle the error.


Here is the script.




use tempdb
go

create table t1 (a int)
create table t2 (b int)
create table t3 (c int)


Begin tran

Insert into t1 values (1)
Insert into t2 values (2)
Insert into t3 values (3)

IF @@error <> 0
Rollback tran
else
commit tran
-------------------------------------------------------------

Select * from t1
Select * from t2
Select * from t3
-------------------------------------------------------------

Drop table t3

-------------------------------------------------------------

Set xact_abort on
Begin try
Begin tran insertNow

Insert into t1 values (1)
Insert into t2 values (2)

save tran insertNow

Insert into t3 values (3)
commit tran insertNow
End try

Begin Catch

IF (XACT_STATE()) = -1
BEGIN
PRINT 'The transaction is in an uncommittable state.' +
' Rolling back transaction.'
ROLLBACK TRANSACTION insertNow
END;

-- Test if the transaction is active and valid.
IF (XACT_STATE()) = 1
BEGIN
PRINT 'The transaction is committable.' +
' Committing transaction.'
COMMIT TRANSACTION insertNow
END

End Catch



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After having did this, we add 1 at grp field.
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connection 2.
an other application could insert at the same time record in this table orv with same parameters.

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I've created a table call TEST_DEL i.e.
quote:CREATE TABLE test_del
(v_id INT,
desc CHAR(3)
)

In machine 1, i'm login as USER 1 and try to insert a set of records into the table
quote:
Machine 1
~~~~
BEGIN
DECLARE @li_num int,
@li_start int

SET @li_num = 100000
SET @li_start = 1

WHILE @li_start < @li_num
BEGIN
INSERT INTO test_del VALUES (@li_start, 'zzz', 'xxx')

IF (@li_start > @li_num)
BREAK
ELSE
SET @li_start = @li_start + 1
CONTINUE

END
END




In machine 2, i login in as USER 2 to retrieve the records at the same time...
quote:
SELECT * FROM test_del


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The error I'm getting is:

Msg 156, Level 15, State 1, Procedure payments_sp, Line 55

Incorrect syntax near the keyword 'AND'.

and the sql code looks like this:

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [dbo].[payments_sp]
-- Add the parameters for the stored procedure here
@payment_type varchar(15),
@mydate smalldatetime
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
-- Insert statements for procedure here
DECLARE @myBool1 tinyint, @myBool12 tinyint
SET @myBool1 = 1
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SET @myBool1 = 1
ELSE
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-- set the value to false
SET @myBool1 = 0
IF (@payment_type = 'CODE3' OR @payment_type = 'CODE4')
SET @myBool12 = 1
ELSE
SET @myBool12 = 0

SELECT
SUM(Mydatabase.dbo.[PAYMENTS].[AMT_RECD])
FROM Mydatabase.dbo.[PAYMENTS]
INNER JOIN Mydatabase.dbo.[ACCT]
ON Mydatabase.dbo.[PAYMENTS].[SOME_UID] = Mydatabase.dbo.[ACCT].[SOME_UID]
WHERE Mydatabase.dbo.[ACCT].[CLIENT] = 'MY CLIENT'
AND Mydatabase.dbo.[PAYMENTS].[DATE_RECD] = @mydate
AND Mydatabase.dbo.[PAYMENTS].[BOOL] = @myBool1
AND Mydatabase.dbo.[PAYMENTS].[SOURCE] != 'val1'
AND Mydatabase.dbo.[PAYMENTS].[SOURCE] != 'val2'
AND Mydatabase.dbo.[PAYMENTS].[SOURCE] != 'val3'

IF (@payment_type = 'CODE3' OR @payment_type = 'CODE4')
BEGIN
AND Mydatabase.dbo.[PAYMENTS].[SOURCE] != 'val4'
AND Mydatabase.dbo.[PAYMENTS].[SOURCE] != 'val5'
END
END
GO

SET ANSI_NULLS OFF
GO
SET QUOTED_IDENTIFIER OFF
GO



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SELECT src_terrier.Areacode, src_terrier.siteref, src_terrier.estatename, src_terrier.Securitised, src_terrier.unitref, src_terrier.unittype, src_terrier.unittype_count, src_terrier.tenantname, src_terrier.tenantstatus, src_terrier.tenantstatus_count, src_terrier.unitstatus, src_terrier.unitstatus_count, src_terrier.floortotal, src_terrier.floortotocc, src_terrier.initialvacarea, src_terrier.initialvacnet, src_terrier.TotalRent, src_terrier.NetRent, src_terrier.FinalRtLsincSC, src_terrier.ErvTot, src_terrier.tenancyterm, src_terrier.landact, src_terrier.datadate, src_div_mgr.div_mgr, src_portfolio_mgr.portfolio_mgr, src_centre_list.propcat

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2. Also part of the new query, not only do I want it to match the siteref, I also want it to only match the mm/yyyy of the parameter entered (src_terrier.datadate = @dt_src_date) in the WHERE statement.

Is that any simpler?

Regards



Toni Chaffin
aka Toni


 

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