Update Locking And Notification

Mar 9, 2005

We’re creating a program and need some advice about locking. The program will select data for the user to view; the user may or may not then perform an update on the set. There exists a possibility of another user attempting the same operation at the same time. Thus we want to have the first user lock the data set and the second to be able to select only until the first is complete. We’ve run some tests using the UPDLOCK hint. It works as expect except for the blocking. If a connection attempts to create another Update Lock after another connection has one, then the new connection is blocked. We’re looking for a way to let the program know that an update lock is in existence before it tries to create a new one. The sp_lock procedure can display all the locks, but you can not select specific values (i.e. select any update locks on ObjectID = x). Do any of you know another way or how we can use sp_lock for our purpose?

Thanks in advance.

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Data Update Notification

May 27, 2007

Please Help!!

I have been trying to think of a solution to a problem i have and still not sure how to go about it.

I have a database filled with message data that is sent by one user to another.What i am trying to do is have it so (if users are online) they are notified - by a popup or something - that a new message has arrived for them.My idea was to create a trigger on the message table to update a change table with sender and recipient ids and date of change in it.Not a problem so far but what is troubling me is that i want the recipient to automatically query this change table every say 30 seconds to check if new message has arrived with their id.Tryed using ajax update panel and timer but naturally that kept posting back whole page - looks really terriable :( - tryed sqlnotification but as far as i can see that is only changing cached data for current data - not the same issue i think.Is there a way to query db table regualry without the client side knowing? - thinking along lines of how outlook requeries server for new messages and displays popup to say new message but doesnt interupt you if doing something else.Any help would be greatly appreaciated.Thanks  

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Apr 16, 2008

i want to make a stored procedure that will update the notification flag in the table.

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Aug 8, 2005

Hello,I'm following the tutorial for setting up notification services, available here:  ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/sqltut9/html/44aa0556-b9c2-48f5-8775-134bbe0b90aa.htm.  Where it says:Update the Instance of Notification Services
After you modify the ADF, you update the instance of Notification Services to add event class objects to the application database:

In Object Explorer, expand Notification Services.
Right-click Tutorial, point to Tasks, and then select Update.
In the Update Instance dialog, click Browse, browse to the TutorialICF.xml file, and then click Open.
In the Parameters grid, enter values for the _ServerName_, _DBEngineInstance_, and _InstancePath_ parameters. Use the same values you used to create the instance.
Click OK.
Review the Notification Services - Update Summary dialog box, and then click Update.
When the update actions complete, click Close.
I'm getting the error:  The instance must be disabled before it can be updated or upgraded.  How do I do that?Thanks.

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Dec 12, 2000

I would like a simple statement to select some rows and then update them. I would like to use SERIALIZABLE locking, will this do the trick. Below is my TSQL

SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
begin tran
select * from patient_medication_dispersal_ where ddate =
convert(char(10),getdate(),101)

update patient_medication_dispersal_
set rec_status = 1 where ddate =
convert(char(10),getdate(),101) and rec_status =1

commit tran

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Sep 21, 2007



I am trying to run a simple update statement that updates around 1 million records on SQL Server 2005. For example:

update customers
set CustCode='AAB'
where CustType=72

I would like to update the table WITHOUT locking. In this case, there is no need to have "all or nothing" transactions. If it does a partial update and then fails, it's ok to only have half the records updated.

The server is using up a lot of resources creating and releasing the locks. Plus users are getting locked out of the records during the update. I know this is by design, but in this case it's OK. I know I can use the "set transaction isolation level READ UNCOMMITTED" statement to fix the select statements from getting blocked, but there are way too many places that would have to be changed. Plus there are other updates to this table that need to be locked.

So here is my question: Is there a way to do a transaction-less update?

Thanks,
Stuart Fox

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SQL Server 2014 :: Minimizing Locking On Update Statements?

May 4, 2015

I have a main table called Stock for example.

One process ( a service ) inserts data into this table , as well as updates certain fields of the table periodically.

Another process ( SQL Job ) updates the table with certain defaults and rules that are unknown to the service - to deal with some calculations and removal of null values where we can estimate the values etc.

These 2 processes have started to deadlock each other horribly.

The SQL Job calls one stored procedure that has around 10 statements in it. This stored proc runs every minute. Most of them are of the form below - the idea being that once this has corrected the data - the update will not affect these rows again. I guess there are read locks on the selecting part of this query - but usually it updates 0 rows - so I am wondering if there are still locks taken ?

UPDATE s
SET equivQty = Qty * ISNULL(p.Factor,4.5) / 4.5
FROM Stock s
LEFT OUTER JOIN Pack p
on s.Product = p.ProductId
AND s.Pack = p.PackId
WHERE ISNULL(equivQty,0) <> Qty * ISNULL(p.Factor,4.5) / 4.5

The deadlocks are always between these statements from the stored procedure - and the service updating rows. I can't really see how the deadlocks occur but they do.

Another suggestion has been to try and use an exists before the update as below

IF EXISTS( SELECT based on above criteria )
( UPDATE as before )

Does this reduce the locking at all ? I don't know how to test the theory - i added this code to some of the statements, and it didn't seem to make much difference ?

Is there a way to make a process ( in my case the stored procedure ) - give up if it can't aquire the locks rather than being deadlocked - which leads to job failures and emails etc ?

We are currently trying to filter down the data that is updated to be only the last few months - to reduce the amount of rows even analyzed - as the deadlocking does seem to be impacted by the number of rows in the tables.

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Oct 10, 2006

Hi guys,
 
            I faced problem related to Locking and Isolation Level on Table(s).
 
            My problems is there r some tables which r frequently updated, and I also want to fire select query over  those tables every 1 seconds and want to get only committed records.
            In current scenario we start transactions with ReadCommitted Lock for updating records. But in this scenario I can€™t get select query result because of some of recourses r used by transactions so after some time it gives Deadlock error.
 

          So I want solution like both operation run simultaneously and get only committed records at a time of transaction running
            Please help me for solving my problem.

 

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Morning all!

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Hi,
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Dear all,

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I m n urgent need for this problem

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Regards

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SO PLEASE GIVE ME THE CODING

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thanks

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Hello,

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I have also tried with the Database Maintenance Wizard but even then it just not work.

I have noticed that others have experienced the same problem but i have seen no solution yet.

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Hi, looking for some help on job notification emails in SQL 2005.

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Any ideas why it works from the Maintenance Plan section, but not the "Jobs" notification section? Am I forgetting something?

I have recently migrated a SQL2000 instance to SQL2005, and would now like to setup all the existing jobs to notify me if they fail.

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