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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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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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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Mar 30, 2004
Do I have other option beside using IF..ELSE IF? TIF
-- 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
SET @VRUSERVICEMIN = 46
SET @BILLEDFLAT = 0
-- PROCESS ONLY RECORDS WHERE THERE IS NO FLAT FEE
IF @BILLEDFLAT = 0
BEGIN
IF @VRUSERVICEMIN BETWEEN 0 AND 15
BEGIN
SET @VRUSERVICEMIN = .25
END
ELSE IF @VRUSERVICEMIN = 15
BEGIN
SET @VRUSERVICEMIN = .25
END
ELSE IF @VRUSERVICEMIN BETWEEN 15 AND 30
BEGIN
SET @VRUSERVICEMIN = .5
END
ELSE IF @VRUSERVICEMIN = 30
BEGIN
SET @VRUSERVICEMIN = .5
END
ELSE IF @VRUSERVICEMIN BETWEEN 30 AND 45
BEGIN
SET @VRUSERVICEMIN = .75
END
ELSE IF @VRUSERVICEMIN = 45
BEGIN
SET @VRUSERVICEMIN = .75
END
ELSE IF @VRUSERVICEMIN > 45
BEGIN
SET @VRUSERVICEMIN = 1
END
END
PRINT @VRUSERVICEMIN
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Apr 1, 2007
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sql = sql & Request.Form(Now) & "','"
sql = sql & Request.Form("nametxt") & "','"
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Dec 31, 2004
Hi,
I have a table with one field set at nvarchar (4000)
This is sometimes not big enough and I get an error that the max row size has been reached.
How do people handle the error when the max row size is reached and gracefully inform the user?
Also, should I really be using Ntext instead, would this be better - is there a performance penalty?
Much obliged.
RG
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Jan 13, 2006
Hi,
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Thanks
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I don't know what's wrong with SQL2000 setup, the problem is:
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May 20, 2002
I'm having trouble with something and I was hoping that you could point me in the right direction.
Here's the scenario:
I have a VB application that clients use to add records to a SQK 2K DB. The info they have added that day is shown in a grid. They have the ability to edit items in the grid, and then update those changes to the database. The problem is that sometimes they change the values to something they shouldn't. To combat this I've started experimenting with check constraints. In query analyzer I test the constraint by trying to update an entry to an 'illegal' value. When I do this, I get an error saying: "Server: Msg 547, Level 16, State 1, Line 1" and the change is not made. What I'd like to do is to give the user a dialog box notifying him of the error. Is there a way to have a sub-routine or stored procedure be triggered when a message of this type is generated?
My specs are: W2K pro clients, SQL2K on an NT4 sp6a server. Application is written in VB6.
Any help is greatly appreciated.
thanks,
-scott
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I have a select statement that works, but I know there has to be a better
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Hi All,
We have got a new HP server and SQL is preinstalled, But when we are trying to start SQL, it gives an error "The handle is invalid".
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Please assist.
regards,
Jatin
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Sep 10, 2006
I have a need when a Update, Insert or Delete is done to a record in DB "A", it will send the appropriate UID to a different table in different DB "B".
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However - my question is what is the best approach and what's the best way to establish the connection to DB "B" for the UID from within DB "A"? We can't use linked servers - DNSLESS string would be the preferred connect way. Not sure how to execute it within a trigger.
Is even using a Trigger to Stored Proc the best way?
What about Transaction Replication - which I've never attempted - is that a better way?
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Thanks as always for your input,
Peter
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Hi,
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Is there a way to handle 1:n relations?
For example:
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Best regards,
Thorsten
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Jul 20, 2005
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Feb 19, 2008
Hello
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Thanks
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Apr 29, 2008
Here is the basic situation.
(1) I have 2 packages that run independently of eachother.
(2) Both are scheduled in SQLServer Agent Jobs as separate jobs.
(3) Job A is scheduled to run every 12 hours and Job B is scheduled to run every 10 minutes.
(4) However, I want to prevent Job B from running if Job A happens to be running.
(5) It is unknown exactly how long Job A will take to finish so I can't schedule Job B around it.
The way I wanted to approach this situation is as follows.
Within Job A's package, create a "marker" file when the package starts and delete it when the package finishes. So the existence of this marker file will tell Job B's package if it should run or not.
The concept is simple, but I'm not sure how to implement this.
For example, to create the marker file, I would use a File System Task, but I don't see an option in there to "create file". (However, I do see an option for "delete file".) Also, what task would I use in Job B's package to check if the marker file exists.
Lastly, If you have better approach, I would like to hear about it.
Thank you.
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Oct 16, 2006
My way:
add column (boolean) to speicify whether is null or not in drived column component, i feel that's a little difficult
any better ideas? thanks
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Nov 11, 2006
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{
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I have a page that batches (holds) all the payments in a work table and I can post them to the correct loan record but I'm just not sure how I would ask a stored procedure to mark the tblLoanPaymentSchedule with the PaymentRecDate for each payment posted. The schedule is pregenerated so that a payment due reminder can be sent out.
I appreciate any suggestions,
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Then I can filter in my stored procedure on the bit column WHERE (dbo.tblCodes.CodeSelect = 1)
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I'm hoping someone has a suggestion on how I might avoid the users having this problem.
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Mar 13, 2008
Hi, I am using transaction that inserts records on two tables TableA and TableB. TableA primary key is used as foreign key in TableB. now problem is that how can i get the primary key of tableA new inserted row so that i can use it as foreign key in TableB.What i am doing that i got a collectionA that contains records of TableA. When new row inserted in TableA how can i update my Collection A without committing the transaction. The main purpose to update CollectionA is only to get primary key of new inserted row. thanx
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Dec 8, 2004
Hi!
My problem/"goal to achieve" is the following..
Users can insert orders in a db-table. The date on which they've been created is stored.
I want the server to insert a new record in another table (accounts) for every order which is older than 2 weeks.
How should I do that?
With a custom action which checks all orders (a customer must press some button every day).
Or a static "update-class" with a kind of timer which does the action every 24 hours?
Of course an automatic solution will be the best! Another question is: how can i ensure that an instance of this "update-class" will never die?
Thanks so far...
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Jan 23, 2006
This may be a loaded question, but I was wondering if anyone could outline the main options we have available to us for handling data access with ASP.net 2.0 / SQL Server 2005.
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Can anyone either outline the main options or point me to a resource that better explains this? Thanks!
Josh
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Jan 23, 2001
Hello,
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Qinglee
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Sep 2, 2004
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I am using sql server 2000 and visual studio 6.0 (sp 4)
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Nov 5, 2004
I have a master table which has demographic data such as name, dob, location along with a primary key id. It will have about 10-12000 records. We get a refresh file every hour which may or may not have corrections for these records hourly with about 3,000 records. I put this data into a table. This data should be considered always to be correct. To handle the update to the master table I need to create an update process. I can take one of two approaches, just update all the records in the master table regardless if they are correct or not, or do some type of left join on those that do not match (in other words, only update the ones where thae names or dob don't match) There is an underlying update trigger on the patient master which will also fire if these values are changed. An opinions on a best approach?
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