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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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.
If the email was succesfully sent the flag will be updated as SENT. And if it is un successful the flag will be NOT SENT in column of the table in SQL. The email will be send using .NET codes and updates of notification flag will use SQL stored procedure. Please help
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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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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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Apr 8, 2004
Morning all!
My SQL server email job notifications have stopped working, but mails sent through the xp_sendmail command still work.
The only thing that has changed recently is the SQL server agent account passwords have been changed, these accounts are normal win2000 domain accounts.
Any ideas cos I am fully stumped?
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Jan 2, 2008
Is it possible to set up a Job to send a notification , if a process is blocked for more than a minute on SQL Server 2000.
Thanks for any help on this
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Jan 31, 2008
I wish to know if there is anyway to find out if a perticular job on SQL Agent was executed or not. I am not looking for Log History of the job, but, something like a trigger that will fire an email to notify that a perticular job that was scheduled to run at a certain time did not run.
To explain in detail, I have a job that is scheduled to run every 15 min. This job is crutial and I wish to be notified if the job was not run for some reason or other. I already have a program that delivers me the history log of the job each day, but, checking history to see if the job ran or not every 15 min is not possible. Again, I am not talking about the job success or failure, but the fact that the job has run or not - thats it !
If you are suggesting a SMO object, I will appriciate if you provide me with the code or alternatively a source to refer.
Thank you.
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Oct 22, 2007
hi all i have found for function as function: SubscriptionEnumeration in API of notification service, i want display myAlert(notifications) in(for example: one day).the Function SubscriptionEnumeration display Subscription of (subscriberId,subscriptionType,nsApplication) it can be made this ?thanksHungN
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Jan 9, 2008
Hi,
I want to build sql notification service in my web application and i not know how to build it. Please help me how it possible and any sample code then pls send me else give me link of website. Its very urgent for me, now i am using timer for checking for updation in database and i want to notification service for that because its take many time and timer fire every time even database change or not.
Jaydev Jangid
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Apr 30, 2001
hi,
An application, every one hour it connects to sqlserver and uploads data from MSAccess database.i should get the notification weather that application is connected to the server or not.because this application gets currepts very often.
any help is appreciated.
thanks
preethi
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May 18, 2000
Does anyone know how I can receive some type of notification (an alert) that fires when a new database is created (or an old one deleted) on a server?
Thanks.
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Sep 12, 2000
I have set up SQL Mail on a SQL 7.0 box and I can successfully schedule tasks and receive e-mails from them. However, when I try to get mail notification from a scheduled DTS package I run into problems and no mail is sent. Under Profile Name the only item selectable is Microsoft Outlook. I've tried selecting this as well as leaving the profile blank and nothing seems to work. We use POP3 server and Microsoft Messaging. Our corporate e-mail system is Notes so we forward mail through the POP3 server via Internet mail to our Lotus Notes system.
Any suggestions so that we could get our DTS mail notification working? Anything I could try that I haven't?
Thanks!
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Aug 10, 2004
Does anyone know if there is any software available that notifies specified people when an error above a certian level occurs. Im thinking along the lines of email and text message.
Im running sql server 2k at sp3a level, and the software will have to be compatible with it so as to get the event notification to pass the information on.
If there isn't any software, would anyone know of any scripts that will do this?
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Apr 14, 2006
MSDE 2000? Thanks.
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Oct 25, 2005
Can you send these to a group of DBA's
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Feb 26, 2007
How can I set up the notification email when one of your jobs got failed using Database mail..
I've already set up the database mail ... but I am not quite sure how to use the database mail to send a notification when a job failed...
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Aug 17, 2007
Dear all,
I would like to know, is there any method that the notification can be send more than one person? (SQL server agent--> Job Properties--> Notification--> email)
The dropdownbox list allow one email only, can I add more people on the email list, or insert more email address in the same operator?
Thanks to all
johnson Mok
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Oct 22, 2007
Hi,
Can anyone tell me abt SQL Notification Service ???
Is that SQL Programming application or can be implemented with other Dot Net Languagues ???
Need to know further that this services are implemented only by the Database Engineers or integrated with the Application development using .Net Language like C# etc ????
I m n urgent need for this problem
Thanks in advance
Regards
Aravind
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Dec 18, 2007
Hi,
I have scheduled a job that runs every minute.
If the job does not succeed, then I would like my front end application to be notified.
I am not sure if this is a reasonable way but I am thinking of somehow
populating a table (Only if the scheduled job fails) in sql server and then read that table every minute from the front end application.
So, is it possible to populate a table if a job fails?
I do not see any options for this in the properties of the job.
Thanks
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Jul 20, 2005
Hi all,I wanted SQL server to sent me an email when it reboots. I created an Alertbut doesn't seem to be working. Any suggestions.Thanks,
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Jul 17, 2006
Is there any way to configure a notification icon in the start tray in Express 2005 (like we had in SQL Server 2000) with a little green (or red) arrow (or dot) to indicate whether the server's up (or down)?
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Mar 26, 2008
i have a scheduled ssis package and because it's pretty critical i have to do a lot of error handling. inside the package all possible errors are handeld but now i have the question if there's a way to check whether a scheduled sql server job was started successfully or not. because if the job doesn't start i cannot get an error notification from inside the ssis package. in sql server management studio there's the possibility to send a notification if a job fails, but i don't know if this also includes the case when the job doesn't start at all.
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Sep 17, 2007
hi i am getting the error for granting
GRANT SUBSCRIBE QUERY NOTIFICATIONS TO sa
error is
Cannot find the user 'sa', because it does not exist or you do not have permission.
SO PLEASE GIVE ME THE CODING
step by step for notification
thanks
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Dec 1, 2006
Hello,
I have a problem with the notification. I have enabled Database mail and i have created an Operator.
Under SQL Server AgentJobs and then in the job properties i have enabled notification but i don`t receive a mail. Test e-mail works fine but "real" e-mail not.
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.
Could you please help me? What can cause this problem? What`s the best i can do to start searching for the solution? Thanks!
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May 14, 2008
I need to set up an automatic email notification. Right now, I have a subscription that is working. The subscription runs a report and puts the resulting pdf into a folder. I need a way to notify users (preferrably in an Outlook distribution list) when the pdf is created. I'm amazed that this basic feature is not built into the subscription capabilities.
Can anyone please tell me how to best accomplish this? I'm familiar with vb.net if that helps.
Thank you very much.
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Apr 7, 2008
i've scheduled a few ssis packages as sql server agent jobs. is there a way to get a daily notification via mail where all planned and all processed jobs are listed?
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Feb 15, 2008
Hi, looking for some help on job notification emails in SQL 2005.
I've created a backup job in the Maintenance Plan section of SQL2005, and added a "Notify Operator" task to notify me when the job completes.
I've setup Database Mail, and I am getting the notification email whenever I run the job. So this is working fine.
The problem is when I got to the 'Jobs' folder, and into the properties of my backup job, I set it up to notify me from the notifications option, but I am not getting any emails. For now I have set it to notify me when the job "succeeds".
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.
Any advice would be helpful
Thanks
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Oct 30, 2007
hi,
When SQL server notifies the application that the records in a table has changed, is there a way to know which record has changed from the application?
Let me give an eg.
Consider that we have a table customer. We have registered for a notfication for 2 customers, say Cust id 1 and Cust id 2. Now , when records for these two customers changes we get a notification. Is there a way in .Net by whihc we can get whihc customer has been modified?
Thanks
Man.
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Aug 11, 2006
I am replicating using SQL Server 2000.
I have several merge agents which periodically fail due to locking contention. This is not a problem. The agent just runs again and is almost always successful, eventually.
I need a way to be alerted when the merge agent has failed three times consecutively.
Is there a way to do this?
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