Long Running Transaction Blocking Queue
Jul 20, 2006
Hello,
I seem to be misunderstanding the way transactions work with service broker queues. We have developed and deployed a service broker application that 5 queues and a windows service for each queue on multiple servers (3 currently). Due to a last minute issue, we had to not use transactions when the services executed a recieve and I am not updating the code base to use transactions and am running into blocking issues. One of the services runs for 90 seconds (spooling to the printer) and all of the servers block on the receive operation for this queue. I thought that if I was receving messages from a single conversation, other receives against this queue would not block.
Thanks,
Jim Stallings
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Oct 1, 2007
We have a web-based third-party application that has both background processes and user activity requests running in the same database (SQL Server 2005 SP2). The problem is that a background process will start a long-running transaction and hold an exclusive lock on a few rows in a given table (a small table, <100 rows). The web clients need to scan this same table, but when their "select *" statements get to those locked row(s), the web client queries stall waiting for that exclusive lock to be released. This effectively brings the entire web front end to a halt because all clients must hit this table for each user action. I realize that this is the classic lock condition that multiversioning databases like Oracle, PostgreSQL, SQL Server Compact Edition, and other databases do not suffer because they don't use shared read locks like SQL Server. But since we're on SQL Server for this app, what is the way to get around this problem? Modifying the clients to use WITH (NOLOCK) is not an option... there will be major consistency issues unless the clients run in Read Committed or higher. Any ideas? We could tweak this app if needed. Does SQL Server 2008 introduce multiversioning or at least some mechanism to get around this problem? I did not see it mentioned on the Microsoft site, but maybe I missed it. Thanks in advance.
Austin
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Dec 6, 2005
I just wanted to post a follow up to a message I posted some months agoabout a long running transaction that was blocking all other users...The link is belowhttp://groups.google.com/group/comp...649bee2002646a2By using the new "Row versioning" functionality of SQL 2005, itcompletely solved this problem. By reading the books online, it saysthere is a performance impact, but that the better performance of SQL2005 in general might offset it. So far this seems to be the case. justposting it here in case anyone else has the problem. The SQL command Iihad to execute to get everything working properly was:ALTER DATABASE DBnameSET READ_COMMITTED_SNAPSHOT ON;
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Aug 25, 2007
How can I execute a long running transaction using something similar to the fire and forget pattern?
I intend to start the execution of a very long stored proc from within IIS. I would like to execute a sql script that will start the job and return immediately so that it doesn't hold an IIS thread.
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Mar 27, 2007
We are using SQL Server 2005 mirroring with the witness server.
In most cases whenever a failover was triggered we saw it happen in a matter
of a few seconds. However, the last time it took about 15 minutes - we suspect
due to Connection being blocked.
Would appreciate any information on what could cause this?
We have 2 databases that run on the server.
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Sep 1, 2006
If I start a long running query running on a background thread is there a way to abort the query so that it does not continue running on SQL server?
The query would be running on SQL Server 2005 from a Windows form application using the Background worker component. So the query would have been started from the background workers DoWork event using ado.net. If the user clicks an abort button in the UI I would want the query to die so that it does not continue to use sql server resources.
Is there a way to do this?
Thanks
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Sep 10, 2007
I have a 2GHZ cpu with 1GB of RAM. I occassionally see very slow (long) queries against a local SQL Server 2005 Express (SP2) database. The issue occurs against different SQL Queries, but all queries are rather basic select statements Perfmon shows that the SQL Server counter for the "MEMORY GRANT QUEUE WAIT Avg MS" gets extremely high (25000+ ms). Perfmon also also shows that PAGING is not occuring, and the system is not under unsual stress. The problem is not reproducible with MSDE.
Has anyone seen this issue, or have any recommendations for a next course of action?
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Mar 29, 2006
I have a 3 simple packages get called from master package. First package populates time dimension (stored proc), second one populates transaction type dimension(stored proc) and the final one populates date dimension.
I set the TransactionOption = Required in the Master package, every thing else (package & component) set TransactionOption = Supported.
I have been testing transactions, basically I made time and transaction type dimension to fail and the package did roll back. I am stuck in the date dimension.
Within Date dimension I got a stored procedure which populates calendar date attributes into Wrk_Date table. Then I have a data flow task which reads from thats working table, but it cant access it. I tried running SP_WHO2 command, and the status is SUSPENDED, being blocked by id -2.
I saw someone had similar problem and I did read Ash's comments. I did try to change the isolation level, didnt help.
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=74372&SiteID=1
Any thoughts please?
Thanks
Sutha
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Jul 20, 2005
We are having a really big problem with a zombie process/transactionthat is blocking other processes. When looking at Lock/ProcessIDunder Current Activity I see a bunch of processes that are blocked byprocess 94 and process 94 is blocked by process -2. I assume -2 is azombie that has an open transaction. I cannot find this process tokill and it seems that this transaction is surviving databaserestarts. I know which table is locked up and when I run a select *from this table it never returns. Does anyone have any ideas as tohow to kill is transaction.Any help is appreciated.A. Tillman
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Mar 11, 2008
Scenario: (1) Initiator/Target are running on different machines; (2) Target is on SQL Standard Edition with service pack 1; (3) Initiator ends the conversation.
If Initiator is running on SQL Express Edition with service pack 1 or 2, €śSend message€? and €śEnd conversion€? will introduce two messages in initiator€™s sys.transmission_queue. One is empty message with correct message type; the other is empty message with no message type. Both of them are from the Target to the Initiator.
If Initiator is running on SQL Standard Edition with service pack 1, with same stored procedure (attached below), there is no message left in initiator€™s sys.transmission_queue.
We like to find the way to make Initiator on SQL Express Edition acting same as it on SQL Standard Edition, namely not left messages in the initiator€™s sys.transmission_queue
CREATE PROCEDURE [dbo].[CreateMessageForQueue]
@message varchar(max)
AS
BEGIN
SET NOCOUNT ON;
DECLARE @handle UNIQUEIDENTIFIER;
BEGIN DIALOG CONVERSATION @handle
FROM SERVICE [TCP://Initiator:4321]
TO SERVICE N'TCP://Target:4567'
ON CONTRACT LogContract
WITH ENCRYPTION = OFF;
SEND ON CONVERSATION @handle
MESSAGE TYPE LogMessage(@message);
END CONVERSATION @handle
END
Thanks,
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Aug 22, 2007
I have a pretty complex query that aggregates lots of data and inserts multiple rows of that data into a reporting table. When I call this SPROC from SQL Server Management Studio, it executes in under 3 seconds. When I try to execute the same SPROC using .NET's SqlCommand object the query runs indefinitely until the CommandTimeout is reached. Why would this SPROC behave differently with the same inputs, but being called from .NET? Thanks for your help!
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Aug 20, 2001
Hi everyone.... I'm trying to execute this update statement... It takes an eternity... any ideas on how to rewrite or speed it up?
It's a several step process... below is everything that i run, one step at a time. The final update statement is what takes so long. It should only affect about 2600 rows out of a potential 9000. That's why I'm confused on the response time
select d.olddevicename, de.device, d.newdevicename into #temp9
from dns d, devices de
where de.device = d.olddevicename
update #temp9 set device = newdevicename where olddevicename = device
update devices set device = #temp9.device from #temp9, devices where #temp9.device in
(select #temp9.device from #temp9, devices where #temp9.olddevicename = devices.device)
Thank you!
J.
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Jan 10, 2001
Hi all,
I have 3 three scheduled job: one runs onece a day, one runs once per hour, and another runs every 17 minutes. It is a NetIQ application. I just scheduled SQL Server maintianace job last night which ran at 2:00Am and 4:00Am. This morning, I came in office and found all my jobs were still running; and they were all blocked by the first 3 jobs. I had to kill all of them. In this afternoon, I kicked off one of my many DTS packages which runs usually about 40 minutes, but it failed. I tried several times but no luck. I suspected one of user tables corrupted or one of stored procedures corrupted. After I recycle the server, and dropped the table and the stored procedure, and recreated them, the package went fine. The store procedure involves many updates and inserts.
The question I have is: is it possible to cause this problem because I killed the unfinished jobs (especially the sql maintanace job)?
NOTE: the sql maintanace job does not include the backup of database and transaction log.
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Feb 7, 2003
When I execute the following stored procedure it runs for about a minute.
CREATE PROCEDURE EquipmentListByProduct
(
@iProdTypeId int
)
AS
SET NOCOUNT ON
DECLARE@iError int, @iRows int
SELECT pn.prodTypeId, pn.prodId, pn.prodName
FROM prodNames pn
WHERE pn.prodTypeId = @iProdTypeId
SELECT@iError = @@ERROR, @iRows = @@ROWCOUNT
IF ( @iError <> 0 )
BEGIN
RETURN@iError
END
IF ( @iRows = 0 )
BEGIN
RETURN-1
END
RETURN@iError
GO
The table only has 22 records.
Do I need to index the table? If so how do I do this?
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Mar 11, 2003
My backups are running 5-6 hours on SQL2000. I'm sure they only used to take 1 hour or so. On another server, backing up the same database (both about 50 gig), the backup only takes 45 min - 1 hour. What can I look at to see why it's taking so long ?
(edit) I'm using a maint plan to backup to disk
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Jul 30, 2004
Trying to come up with a way to monitor (without profiler, hopefully with a job and a select statement) a specific sql job that may cause a problem if the duration is too long. It seems that there is an sp called sp_sqlagent_log_jobhistory that shoves a record in sysjobhistory, but only after all the job steps run. Anyone tried this before?
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Apr 3, 2008
1. could any one tell me in a simple way how to troubleshoot long running queries.
2.what is the default recovery model
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May 9, 2008
Hello,
I want to find long running queries?
Can any one help me?
Thanks
Prashant Hirani
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Jun 4, 2008
Hello Gurus
I am using sql 2005 and one job status is executing in job monitor in 2005,How can i check since how long this job is running?
Please advice
Nitin
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Jul 20, 2005
I've got a server (SQL 2K, Win2K) where the backupshave started running long.The database is a bit largish -- 150GB or so. Up untillast month, the backups were taking on the order of4 to 5 hours -- depending on the level of activity on theserver.I'm using a T-SQL script in the SQLAgent to run thebackups. Native SQL backup to an AIT tape drive.Now, for no apparent reason, the backups are takingon the order of 24 to 26 hours. The backups completesuccessfully -- no errors, just taking an outrageouslylong time to complete. DBCCs check out AOK, noproblems with the database.No changes to the machine. No hardware changes. Nosoftware changes. Weird.Multiple tape media have been tried -- it's not a caseof a tape going bad.We've had no problems with this box for almost 4years. Now it's gettin' jiggy with us!Any ideas on where to start with this one?Thanks in advance.
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Jul 6, 2007
Hi. I'm fairly new to SSRS, and very new to this forum. I have a report based on a stored procedure. I've optimized the procedure so that it runs from 2-4 minutes (previously over half an hour). However, when I run the report that calls the sp, it runs forever (well over 45 minutes in some cases), and the users basically give up on it. Any ideas of why this happens and what steps I can take to improve performance?
Thanks,
Marianne
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Dec 21, 2006
I need to execute a long running package (it takes about 16 hours to finish) to load a data warehouse for the first time with all historical data. This package it's a master package and execute other packages; I log the start time and the finish time of the package in a table to manage future incremental loads.
I executed the package on sql server where it is saved, but after 8 hours it was running, a new package was started automatically. Then two more packages started .. each every two hours.
I set the MaxConcorrentExecutable = 4, this could affect this strange behavoir ?
Anyone could imagine wath happened ?
Thanks
Cosimo
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Jun 2, 2006
Hi,
I'm trying to optimize a long running (several hours) query. This query is a cross join on two tables. Table 1 has 3 fields - ROWID, LAt and Long. Table 2 has Name, Addr1,Addr2,City,State,Zip,Lat,Long.
Both tables has LatRad - Lat in radians, LonRad- Lon in Radians. Sin and Cos values of Lat and Lon are calulated and stored to be used in the distance formula.
What I'm trying to do here is find the nearest dealer (Table 2) for each of Table 1 rows. The Select statement takes a long time to execute as there are about 19 million recs on table 1 and 1250 rows in table 2. I ran into Log issues- filling the transaction log, so I'm currently using table variables and split up the process into 100000 recs at a time. I cross join and calculate the distance (@DistValues) and then find the minimum distance (tablevar2) for each rowid and then the result is inserted into another Table (ResultTable).
My Code looks like this:
Declare @DistValues table (DataSeqno varchar(10),Lat2 numeric(20,6),Lon2 numeric(20,6),StoreNo varchar(60), Lat1 numeric(20,6),Long1 numeric(20,6),Distance numeric(20,15))
Declare @MinDistance table (DataSeqno varchar(10) primary key,distance numeric(20,15))
Insert into @DistValues
Select DataSeqno,T.Lat Lat2,T.Lon Lon2,S.StoreNo,S.Lat Lat1,S.Long Long1,
distance=3963.1*Case when cast(S.SinLat * T.SinLat + S.CosLat * T.cosLat * cos(T.Lonrad - s.Lonrad) as numeric(20,15)) not between -1.0 and 1.0 then 0.0 else acos(cast(S.SinLat * T.SinLat + S.CosLat * T.cosLat * cos(T.Lonrad - s.Lonrad) as numeric(20,15))) end
from dbo.TopNForProcess T , dbo.Table2 S where Isnull(T.Lat,0) <> 0 and Isnull(T.Lon,0)<> 0
Insert into @MinDistance
Select DataSeqno,Min(distance) From @DistValues Group by DataSeqno
Insert into ResultTable (DataSeqno,Lat2,Lon2,StoreNo,LAt1,Long1,distance)
Select D.DataSeqno, D.Lat2, D.Lon2, D.StoreNo, D.LAt1, D.Long1, M.distance from @DistValues D Inner Join @MinDistance M on D.DataSeqno = M.DataSeqno and D.Distance = M.Distance
I created a View called TopNForProcess which looks like this. This cut down the processing time compared to when I had this as the Subquery.
SELECT TOP (100000) DataSeqno, lat, Lon, LatRad, LonRad, SinLat, cosLat, SinLon, CosLon FROM Table1 WHERE (DataSeqno NOT IN (SELECT DataSeqno FROM dbo.ResultTable)) AND (ISNULL(lat, 0) <> 0) AND (ISNULL(Lon, 0) <> 0)
I have indexes on table table1 - Rowid and another one with Lat and lon. Table2 - Lat and Long.
Is there any way this can be optimized/improved? This is already in a stored procedure.
Thanks in advance.
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Jul 20, 2005
Hi,I am still not very proficient in SQLServer. So apology if thequestion sounds basic.We have a script to clean old unwanted data. It basically deletesall rows which are more than 2 weeks old. It deletes data from33 tables and the number of rows in each table runs into few millions.What I see in the script (not written by me :-) ) is that all data isdeleted within a single BEGIN TRANSACTION and COMMIT TRANSACTION. AsI have background in informix, such an action in Informix may resultin "LONG TRANSACTION PROBLEM". Does SQLServer have a similar concept.Also won't it have performance problem if all rows are marked lockedtill they are committed.TIA.
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Apr 13, 2007
I have a SQL procedure that can take several minutes to complete. I allow users to initiate the process through a web site and view a progress bar. When the process is running, though, the site slows to a crawl or times out completely. That long running process seems to block all other queries on the database. Is there a way to give this process a low priority or somehow throttle its resource use so that the other web processes can get a chance to run in a timely manner?
Thanks for any advice.
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Feb 10, 2008
Hello,
I am having some difficulty with data-driven processes in an internal web application using ASP.NET framework 2.0 with SQL Server 2000.
I have a facility where the user enters search criteria to retrieve a list with the idea being that when they click a button the list set is migrated to a table as a batch. The SQL Server processes to perform the database operations can take up to 5min because of volume of data and relational complexity, which is fine.
The only problem is that I'm having trouble managing the SQL Server process if the user closes the browser or go to a new URL etc. If this happens on the client side it's like the HTTP request is terminated but the SQL statement left on the SQL Server still running, eventually it runs to completion but I would prefer the SQL process to also be abandoned and rolled back.
Any idea what is happening here and how it can be handled?
Thanks for any help.
A.C
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Mar 5, 2002
Hello All
I have queries which take over 30 secs to run, which I wish to monitor.
Currently, I am monitoring using sql profiler.
Is there any way of setting up mail to e-mail me when such a query happens.
Could I set up an Alert, or is there some other method.
I want to be able to react to these events faster before the users complain.
I am using sql server 7 enterprise and I have exchange set up.
Any help would be great
Pargat
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Jun 5, 2001
Hi there!,
Problem: I schedule a job that calls a stored procedure which loads around 1.5 million records. The Job takes 19 hrs to complete. However, if i run that stored procedure manually in Query Analyser it takes only 45 minutes..
Did anyone faced this problem? Is this known problem..Any suggestions/recommendations?
thank you.
regards,
Nana
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May 13, 2005
Hello,
I have a very long running stored proc (import and transformation of 2-3 M. records). The duration of about 1h is not the problem.
My problem is that i want to send some notifications to the UI for showing a progress counter in the UI.
Is there any possibility to send send out a msg after certain steps (e.g. after positioning the cursor to next row) via an extended stored procedure which I could catch in my UI?
I would be very appreciative if somebody would send me a hint.
Thank you,
selo
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Jan 4, 2008
I’m trying to write a script that will detect long running agent jobs.
Having looked at this article:
http://www.databasejournal.com/features/mssql/article.php/3500276
It appears that agent job job id’s don’t necessarily get stored in the programname of the sysprocesses table. This is true if the agent executes an os command. It also appears that job steps do not get stored in the sysjobhistory until the step is complete so that cannot be used accurately.
Does anyone know of an effective way to find if there are long running jobs other than these methods?
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Oct 27, 2006
How does one prevent a long running procedure form crapping out in CLR?
I am trying to do a pull from a distant data source and it works, except I have to break down my stored procedure call into several smaller calls. I would like to do everything in one shot, but I get the thread abort exception when I try to get a lot of data.
Any ideas?
Thanks.
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Mar 20, 2008
The query show below is designed to use seasonal profiles to compute 53 weeks of forecast data and then from that compute the number of weeks of supply of each item at each location. The query works but the volume of data produced (20+M rows) is substantial. If I limit the CTE to a single location, it run is 2 seconds and returns 41,000 rows. But when run for all locations and items, it runs for more than 4 hours. Would I do better converting the CTE to a sub-query and adding an index to improve the performance of the main query?
WITH Forecast AS
(SELECT Location_Idx
,Item_Idx
,Week_Code
,(CAST(AnnualQty AS DECIMAL(9))/53.0)*[Profile] AS fcst
FROM dbo.FactReplenishmentProfile rp
INNER JOIN dbo.FactSeasonalProfile sp
ON sp.SeasonalProfile_Idx = rp.SeasonalProfile_Idx
)
SELECT fcst1.Location_Idx
,fcst1.Item_Idx
,fcst1.Week_Code
,fcst1.fcst AS WeekQty
,SUM(fcst2.fcst) AS CumQty
FROM Forecast fcst1
INNER JOIN Forecast fcst2
ON fcst2.Location_Idx = fcst1.Location_Idx
AND fcst2.Item_Idx = fcst1.Item_Idx
AND fcst2.Week_code <= fcst1.Week_Code
GROUP BY fcst1.Location_Idx,fcst1.Item_Idx,fcst1.Week_code,fcst1.fcst
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Aug 30, 2006
I have a table that contains approx 200 thousand records that I need to run validations on. Here's my stored proc:
[code]
CREATE PROCEDURE [dbo].[uspValidateLoadLeads]
@sQuotes char(1) = null, @sProjectId varchar(10) = null, @sErrorText varchar(1000) out
AS BEGIN
DECLARE @ProcName sysname, @Error int, @RC int, @lErrorCode bigint, DECLARE @SQL varchar(8000)
IF @sQuotes = '0'
BEGIN
UPDATE dbo.prProjectDiallingList_staging
SET sPhone = RTrim(LTrim(Convert(varchar(30), Convert(numeric(20, 1), phone))))
END
ELSE
BEGIN
UPDATE dbo.prProjectDiallingList_staging
SET sPhone = phone
END
--2. Remove quotes
UPDATE dbo.prProjectDiallingList_staging
SET sphone = REPLACE(sphone,'"' , '')
--3. Remove decimal, comma, dashes, parenthesis
UPDATE dbo.prProjectDiallingList_staging
SET sphone = replace(replace(replace(replace(replace(replace(sphone,'.',''),',','' ),'-',''), ' ',''), '(', ''), ')', '')
--4. Update failed Validation column if not 10 digits
UPDATE dbo.prProjectDiallingList_staging
SET sFailedValidation = 'X'
WHERE(Len(RTrim(LTrim(sPhone))) <> 10)
--5. Dedup
UPDATE a
SET a.sFailedValidation = 'X'
FROM dbo.prProjectDiallingList_staging a (nolock)
INNER JOIN dbo.prProjectDiallingList_staging b
ON a.sPhone= b.sPhone
WHERE(a.iList_StagingID > b.iList_StagingID)
--6. Update failed Validation column if not numeric
UPDATE dbo.prProjectDiallingList_staging
SET sFailedValidation = 'X'
WHERE(IsNumeric(RTrim(LTrim(sPhone))) = 0)
--7. Update time zones
UPDATE s
SET s.sTimeZone =z.sTimeZone
FROM dbo.prProjectDiallingList_staging s (nolock)
LEFT OUTER JOIN dbo.prPhoneTimeZone z
ON left(rtrim(ltrim(s.sphone)),3) = z.sPhoneAreaCode
--8. Insert into dialing table only records that have not failed the validation
INSERT dbo.prProjectDiallingList(iPrProjectId, sPhoneNumber, sTimeZone)
SELECT @sProjectId,sPhone, sTimeZone
FROM dbo.prProjectDiallingList_staging
WHERE ISNULL(sFailedValidation,'1') = '1'
UPDATE d
SET d.bProcessReporting = 1
FROM dbo.prProjectDialling d
WHERE d.iPrProjectId = @sProjectId
END
[/code]
When I execute this stored proc it runs for more than 5 minutes. Is there anything i can do to speed it up? Maybe there is a faster way of writing these queries?
Thanks,
Ninel
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