How To Handle Locking.

May 7, 2008

Hi All,

Please help me out how to implement the locking in below scenario

Req -

There are two tables Table1 & Table2
If I will insert in table1 then related data fields will be auto updated in table2 , similarly based on the data in table2 table1 data needs to be updated.

Now the sync of table1 & table2 is working fine.

My prob is we are handling the updation/insertion from the UI screens . Two separate screen for each table. When we have multiple user accessing the screens say - User1 updates table1 and User2 updates table2 then we need to implement the locking so that at one time one screen will allow updation in the table1 and hence table2.
The other screen shouldnt allow updation in table2 and hence in table1.

This is very common locking functionality ...but am not getting any way to implement it , Please advise.

Srain.

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Recycling Conversations - Locking When Trying To Insert New Conversation Handle To SessionConversations Table

Feb 8, 2008



Hi,

I have implemented Remus Resanu's implementation from the Recycling Conversations article and I am experiencing locking issue when I try to insert new conversation handles to the SessionConversations table. I have copied the code in the article exactly including the activation procedure. Any ideas why I may be locking. I am thinking it is related to the HOLDLOCK hint on the table.

The sepcific line where I see locking is directly from the article:

INSERT INTO [SessionConversations] (SPID, FromService, ToService, OnContract, Handle) VALUES (...etc)

Thanks

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Error Log Peppered With --&&> 'The Conversation Handle Is Missing. Specify A Conversation Handle.'

Dec 3, 2007

Hi

I'm using service broker and keep getting errors in the log even though everythig is working as expected

SQL Server 2005
Two databases
Two end points - 1 in each database
Two stored procedures:
SP1 is activated when a message enters the sending queue. it insert a new row in a table
SP2 is activated when a response is sent from the receiving queue. it cleans up the sending queue.

I have a table with an update trigger
In that trigger, if the updted row meets a certain condition a dialogue is created and a message is sent to the sending queue.
I know that SP1 and SP2 are behaving properly because i get the expected result.
Sp1 is inserteding the expected data in the table
SP2 is cleaning up the sending queue.

In the Sql Server log however i'm getting errors on both of the stored procs.
error #1
The activated proc <SP 1 Name> running on queue Applications.dbo.ffreceiverQueue output the following: 'The conversation handle is missing. Specify a conversation handle.'

error #2
The activated proc <SP 2 Name> running on queue ADAPT_APP.dbo.ffsenderQueue output the following: 'The conversation handle is missing. Specify a conversation handle.'

I would appreceiate anybody's help into why i'm getting this. have i set up the stored procs in correctly?

i can provide code of the stored procs if that helps.

thanks.

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Jan 18, 2008



We have implemented our service broker architecture using conversation handle reuse per MS/Remus's recommendations. We have all of the sudden started receiving the conversation handle not found errors in the sql log every hour or so (which makes perfect sense considering the dialog timer is set for 1 hour). My question is...is this expected behavior when you have employed conversation recycling? Should you expect to see these messages pop up every hour, but the logic in the queuing proc says to retry after deleting from your conversation handle table so the messages is enqueued as expected?

Second question...i think i know why we were not receiving these errors before and wanted to confirm this theory as well. In the queuing proc I was not initializing the variable @Counter to 0 so when it came down to the retry logic it could not add 1 to null so was never entering that part of the code...I am guessing with this set up it would actually output the error to the application calling the queueing proc and NOT into the SQL error logs...is this a correct assumption?

I have attached an example of one of the queuing procs below:




Code Block
DECLARE @conversationHandle UNIQUEIDENTIFIER,
@err int,
@counter int,
@DialogTimeOut int,
@Message nvarchar(max),
@SendType int,
@ConversationID uniqueidentifier
select @Counter = 0 -- THIS PART VERY IMPORTANT LOL :)
select @DialogTimeOut = Value
from dbo.tConfiguration with (nolock)
where keyvalue = 'ConversationEndpoints' and subvalue = 'DeleteAfterSec'
WHILE (1=1)
BEGIN
-- Lookup the current SPIDs handle
SELECT @conversationHandle = [handle] FROM tConversationSPID with (nolock)
WHERE spid = @@SPID and messagetype = 'TestQueueMsg';
IF @conversationHandle IS NULL
BEGIN
BEGIN DIALOG CONVERSATION @conversationHandle
FROM SERVICE [InitiatorQueue_SER]
TO SERVICE 'ReceiveTestQueue_SER'
ON CONTRACT [TestQueueMsg_CON]
WITH ENCRYPTION = OFF;
BEGIN CONVERSATION TIMER ( @conversationHandle )
TIMEOUT = @DialogTimeOut
-- insert the conversation in the association table
INSERT INTO tConversationSPID
([spid], MessageType,[handle])
VALUES
(@@SPID, 'TestQueueMsg', @conversationHandle);

SEND ON CONVERSATION @conversationHandle
MESSAGE TYPE [TestQueueMsg] (@Message)

END
ELSE IF @conversationHandle IS NOT NULL
BEGIN
SEND ON CONVERSATION @conversationHandle
MESSAGE TYPE [TestQueueMsg] (@Message)
END
SELECT @err = @@ERROR;
-- if succeeded, exit the loop now
IF (@err = 0)
BREAK;
SELECT @counter = @counter + 1;
IF @counter > 10
BEGIN
-- Refer to http://msdn2.microsoft.com/en-us/library/ms164086.aspx for severity levels
EXEC spLogMessageQueue 20002, 8, 'Failed to SEND on a conversation for more than 10 times. Error %i.'
BREAK;
END
-- We tried on the said conversation, but failed
-- remove the record from the association table, then
-- let the loop try again
DELETE FROM tConversationSPID
WHERE [spid] = @@SPID;
SELECT @conversationHandle = NULL;
END;

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-- GET INFORMATION OF THE JOB
DECLARE @JOBIDAS Char(10)
DECLARE @VRUSERVICEHRSAS Decimal(18,2)
DECLARE @VRUSERVICEMINAS Decimal(18,2)
DECLARE @BILLEDFLATAS Decimal(18,2)
DECLARE @BILLREGRATEAS Decimal(18,2)
DECLARE @MIN_HRSAS Decimal(18,2)

DECLARE @COUNT_GREATER_MINTinyInt
DECLARE @COUNT_LESS_MINTinyInt

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SET @BILLEDFLAT = 0
-- PROCESS ONLY RECORDS WHERE THERE IS NO FLAT FEE
IF @BILLEDFLAT = 0
BEGIN
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BEGIN
SET @VRUSERVICEMIN = .25
END
ELSE IF @VRUSERVICEMIN = 15
BEGIN
SET @VRUSERVICEMIN = .25
END
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BEGIN
SET @VRUSERVICEMIN = .5
END
ELSE IF @VRUSERVICEMIN = 30
BEGIN
SET @VRUSERVICEMIN = .5
END
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BEGIN
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BEGIN
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BEGIN
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PRINT @VRUSERVICEMIN

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