I want to select all threads even though the count(Messages.TitleID) is zero.. Is like when u start a new thread with no messages currently posted. How can i modify the codes to do it?
SELECT Thread.ThreadTitle, COUNT(Messages.TitleID) AS NoOfMessage, Thread.ThreadID FROM (Thread INNER JOIN Messages ON Thread.ThreadID = Messages.ThreadID) GROUP BY Thread.ThreadTitle, Thread.ThreadID
Hi All,
I am writing a automated backup script using job scheduler of the management studio and would like to know how can i copy the output messages given by the SQL Server to an external file automatically.
Thanks in Advance
Mitesh
SQL Server 2008 r2 - 6 GB memory...I attempted a backup on a 500GB database but it was taking way too long. I checked the resources on the box and saw the CPU at 100%. I checked the SQL Server activity log and saw a hung query (user was not even logged on) that had multiple threads so I killed it and now the CPU utilization is back to normal.
Trouble is, now all of the threads in the activity monitor for the backup show 'suspended' and the backup appears to be not doing anything.
Hello all,
I am making an auction system using C#, .NET and MS SQL Server.
I have a page to add new products to DB, which works fine.
What I like to have is that, I want to be able to show friendly confirmation and error messages to users.
So it is going to work like this:
- user adds a new product
- if successful there is a message on the page that reads: The products (product name) was successfully added to the database. And form fields are clear, ready for the next product info to be entered.
- if not successful, the message should tell the user and maybe indicates the reason too. Like: the product code used already exists.
Currently for the successful attempts I get the form page with all the fields filled with the entered data and for un-successful one the ASP.NET error page.
Can anybody help please? Does anybody knows about a tutorial or an article or ...?
Thanks a lot.
I'm developing a database-driven program using SQL server 2000 and Visual Basic 2005.
Most of the guys say professional programming is doing the validation stuff (such as the constraints and data integrity stuff like" [0-9][1] " and the use of LIKE IN keywords etc.) in the databse itself.
say i did the data validation contraints in SQL server itself. and now i connect the database with the interface made in 2005. and say a person enters some invalid data through the interface. but the error messages are generated by SQL server. how am i to display the SQL server generated error messages in the VB made interface??
PLS HELP ME .. if the question is not clear pls tell so that i can explain it further.
PLS PLS PLS HELP ME
I'm developing a database-driven program using SQL server 2000 and Visual Basic 2005.
Most of the guys say professional programming is doing the validation stuff (such as the constraints and data integrity stuff like" [0-9][1] " and the use of LIKE IN keywords etc.) in the databse itself.
say i did the data validation contraints in SQL server itself. and now i connect the database with the interface made in 2005. and say a person enters some invalid data through the interface. but the error messages are generated by SQL server. how am i to display the SQL server generated error messages in the VB made interface??
PLS HELP ME .. if the question is not clear pls tell so that i can explain it further.
PLS PLS PLS HELP ME
Can we show numbers inside graphs in SSRS 2005?
I want to show nums in each column in a bar chart graph.
Thanks
For inserting current date and time into the database, is it more efficient and performant and faster to do getDate() inside SQL Server and insert the value
OR
to do System.DateTime.Now in the application and then insert it in the table?
I figure even small differences would be magnified if there is moderate traffic, so every little bit helps.
Thanks.
I'm trying to execute a stored procedure within the case clause of select statement.
The stored procedure returns a table, and is pretty big and complex, and I don't particularly want to copy the whole thing over to work here. I'm looking for something more elegant.
@val1 and @val2 are passed in
CREATE TABLE #TEMP(
tempid INT IDENTITY (1,1) NOT NULL,
myint INT NOT NULL,
mybool BIT NOT NULL
)
INSERT INTO #TEMP (myint, mybool)
SELECT my_int_from_tbl,
CASE WHEN @val1 IN (SELECT val1 FROM (EXEC dbo.my_stored_procedure my_int_from_tbl, my_param)) THEN 1 ELSE 0
FROM dbo.tbl
WHERE tbl.val2 = @val2
SELECT COUNT(*) FROM #TEMP WHERE mybool = 1
If I have to, I can do a while loop and populate another temp table for every "my_int_from_tbl," but I don't really know the syntax for that.
Any suggestions?
Hello, please help!!
I have spent days searching the web and forums for an answer to this simple question and cannot find an example.
I have built a service broker application on sql server 2005. The application puts some xml on an incoming queue which is basically a few parameters to be used in a query. This queue will then call a stored proc which does some business logic and puts the resulting results in another queue also in xml.
I have written a test harness in SQL to put messages on the inbound queue and then some sql to retrieve the returned code from the outbound queue.
What I want to do is be able to convert the SQL which does this into .net code to be used by an application. i.e. write in .net some code to put xml on a queue and then write some .net code to retrieve xml from another queue.
I wouldn't have thought this would be a difficult thing to do and would have been done hundreds of times, but unable to find anything to simply send and retrieve XML to service broker queues....
thanks for your help.. its really needed. I found some links, but they are really vague and often doing select statments in service broker or something like this. I don't want to call any sql, just send and recieve XML on the queues.
any example code that does this, would be really helpfull
kind regards,
David Weeden
Database Developer
How can i delete my old threads from Mythreads.
Any Body
Hi,
I'm trying to troubleshoot a SQL problem that we are having and I'm having difficulty with identifying the guilty process.
Using NT performance monitor I am monitoring all active Threads on the system and I have noticed that one particular SQLSERVR thread (then number obviously changes with each server restart) is hogging 100% CPU.
Is it possible to find out what process a particular thread number relates to ?
As far as I can tell the SQL SPID (from Enterprise manager) does not correlate to a SQL Thread.
Thanks,
Tim
I have an app that is critical to our business. It handles and syncronises several SQL Servers, checks integrety etc. I need to make the app so it can run a few things at once. Does anyone have any experience with this? Currently we use Delphi and ADO. I have been fiddling with DMO to get more performance - I am not sure ADO is very quick for some I tasks I need to do.
I suppose my main question *really* is does ADO/DMO multi-thread and has anyone tried it. If not how do people do it?
Here's what I know about max worker threads:
http://technet.microsoft.com/en-us/library/ms187024.aspx
http://sqlblogcasts.com/blogs/thepremiers/archive/2007/05/17/max-worker-threads-configuration-in-sql-server-2005.aspx
and this is kind-of related:
http://arstechnica.com/news.ars/post/20070529-microsoft-exec-next-version-of-windows-to-be-fundamentally-redesigned.html
How do you know how many threads are being used and how many of those are being shared? Or whether they are all even being used? Are there PerfMon stats for this?
Everyone,I have a data warehouse that at the moment includes around 2500hundred jobs. I am planning for a worst case scenario and would liketo increase the maximum number of sql server threads so that more jobscan execute simultaneously. Could this pose a problem and if so, atwhat number of maximum threads??Thanks!
View 1 Replies View Relatedthat if you reduce your max worker threads it will enhance the ability to kill processes (spid###) which cannot be killed.
Recently, we have been experiencing runaway processes. If you run these processes continuously, eventually it will run without failure. We are investigating as to the reasons why this is happening. At this very moment I am sifting through the code to try and find an answer. Evidently, the process hangs and cannot be killed. We are then forced to down the server and I wish not to do this so often. If I reduce the max worker threads from it's current number now (512) to a lesser number. Will this help? and if so, by how much should this number be decreased.
Thanks a gig for your help.
Hi,I have an application where I need to find out about the followinginformation regarding SQL server:Processors enabledi.Threads allocatedii.PriorityCan somebody throw some light on this. How are the processors relatedto the threads running and the priority is w.r.t. what?Thanks,Verve.
View 1 Replies View Related We've invested ourselves heavily in subscription-based reporting where the SSRS service is responsible for rendering and delivering reports (to email, file shares, printers, document repositories, etc). We figured that this would be a model that would allow for easier scaling. Users submit their reports and allow SSRS to deliver them in due time. The biggest part of our reporting is now done via subscriptions.
However, adding long-running reports and short-running (but very critical) reports together to the same SSRS database has proven problematic. The long-running reports eventually make make the short reports starve for CPU time.
Does anyone know if there is a way to implement a CPU resource allocation strategy so that short running (but critical) reports will always have the ability to run? For example, it would be nice if certain user accounts or even report paths (RDL's) could have dedicated CPU resources (eg SSRS threads on which to run).
In other words, without creating additional ReportServer databases, I'd like a "pool" of threads for "severity 1" report subscriptions, a separate "pool" of threads for "severity 2" and so on. Then we'd be able to make sure that our critical subscriptions would get a chance to run. Sounds pretty straight-forward, right? Can't figure out how to go about this...
Sometimes ( on average once every two weeks ) I am getting the following error message:
Code BlockError: 2008-01-15 06:51:02.91
Code: 0xC0047024
Source: DF FACT SC 1 DTS.Pipeline
Description: The number of threads required for this pipeline is 98, which is more than the system limit of 64. The pipeline requires too many threads as configured. There are either too many asynchronous outputs, or EngineThreads property is set too high. Split the pipeline into multiple packages, or reduce the value of the EngineThreads property.
End Error
This is one of the final stages of the ETL, so several other packages are finishing correctly before this package is run.
When we restart the complete ETL all other packages are automaticly skipped, and when the ETL arrives to this package it runs without any problems.
So my questions are:
What does this error message mean?
Is this "64" a SSIS setting or a SQL Server setting or a server setting?
Can we increase this setting?
The number of engine threads is set to 5 ( default ), what is the relation between the engine thread setting and the system limit of 64?
Can we safely reduce the engine threads property?
What is causing the SSIS package to need 98 engine threads?
I am working on a project that will require the use of SQL Server 2005 Workgroup Edition. We were planning to use the version that comes with 5 CALs instead of the version licensed based on processors due to the enormous cost difference. Our customer who will be using this is a goverment agency and ms charges them ~$800 for the 5 user version, but the version licensed by processor is ~$20000. This software will be potentially installed in lots of locations so cost is a big factor.
The application I am working on is using c#. I am being told that if I use threads, each thread will require a CAL. Is that correct? I can not find anything in the licensing information that explicitly states this. It was my understanding that a CAL based on user or device could make as many connections to the db as needed.
Thanks
SQL Server 2005 gives you a possibility to create managed triggers. In a managed trigger I can create a new thread and process trigger event in various ways. My question is that are there any reasons why I should NOT start new threads in database triggers? The following code shows how I could create new threads. Do you see that this could cause any errors or problems in SQL Server functionality? My goal is to minimize the trigger effects in a database overall performance.
'This handles database updates of AdventureWorks Person.Contact table.
<Microsoft.SqlServer.Server.SqlTrigger(Name:="UpdateContact_Trigger", Target:="Person.Contact", Event:="FOR UPDATE")> _
Public Shared Sub UpdateContact_Trigger()
'Notify:
SqlContext.Pipe.Send("Trigger FIRED")
Dim triggContext As SqlTriggerContext = SqlContext.TriggerContext()
'Ensure that it was update:
If triggContext.TriggerAction = TriggerAction.Update Then
'Open a connection:
Using conn As New SqlConnection("context connection=true")
conn.Open()
'Fetch some information about the update:
Using sqlComm As New SqlCommand
sqlComm.Connection = conn
sqlComm.CommandText = "SELECT ContactID, FirstName, LastName from INSERTED"
Using rdr As SqlDataReader = sqlComm.ExecuteReader
If rdr.Read Then
'Process the data in a separate thread. The thread could send a message to MSMQ about the change
'or process if differently. The purpose of using separate thread is avoid performance hit
'in the application / database operation.
Dim oData As New TriggerData("update", rdr.GetInt32(0).ToString, "contact")
Dim trd As New Threading.Thread(New Threading.ThreadStart(AddressOf oData.ProcessEvent))
trd.IsBackground = True
trd.Start()
End If
End Using
End Using
End Using
End If
End Sub
Just wonder whether is there any indicator or system parameters that can indicate whether stored procedure A is executed inside query analyzer or executed inside application itself so that if execution is done inside query analyzer then i can block it from being executed/retrieve sensitive data from it?
What i'm want to do is to block someone executing stored procedure using query analyzer and retrieve its sensitive results.
Stored procedure A has been granted execution for public user but inside application, it will prompt access denied message if particular user has no rights to use system although knew public user name and password. Because there is second layer of user validation inside system application.
However inside query analyzer, there is no way control execution of stored procedure A it as user knew the public user name and password.
Looking forward for replies from expert here. Thanks in advance.
Note: Hope my explaination here clearly describe my current problems.
using osql to apply SPs in mutiple threadsHello,I got a weird problem when I was using osql to apply scripts for msdedatabase in multiple threads mode. Sometime 2 sps were missing duringthe whole apply process, sometime not, and seems like only those twoSPs met the problem. No error was appeared. Did anyone meet sameproblem before? Or any possible solutions?Thank you very much!
View 4 Replies View Related
hi,
do i need to use specially synchronized code if i have multiple threads inserting, updating and reading rows to and from the same database?? in this case, i know that no 2 threads will try to insert or update the exact same row into the DB, however, multiple threads might try to read the same row from the database.
thanks!
Hi, I'm trying to stress test my web application, but when I get high load, the queries that used to take 10-20 ms starts taking 500 - 2000+ ms. Or to put it another way, when i run them single threaded i can do about 43000 a minute, when they are run in paralell it drops to about 2500 a minute.
What can i do about this ?
There are severeal queries thats affected, but here is one example:
update [user] with (ROWLOCK XLOCK) set timestamp = getdate() where userid = 1''
btw: im running sql server 2005 sp 1. The stress test is run on 3 machines total (web, sql and client) the client is simulation 400 users, cliking a page as soon as the last one is loaded, ie there will always be 400 page requests.
am experiencing excessive SSB thread block'n...sql error log is reporting LOTS of Resource Monitor messages about non-yielding threads (nothing meaningful can be surmised from it).
I am running on a 4way 64bit 2003 box w/6gb ram!!!
SSB architecture is simple implementation... Leveraging async trigger(s) in 42 db's (all on same instance) that post (via srvc) into a mstr db queue...where a listener is pull'n them off and applyies to a table (trying to avoid excessive 1205's that I was experiencing using sync trigger approach before)....messages sit in respective db's trans queue and draining of queues is extremely SLOW!!!! I mean SLOW!!!
Eventually SqlServer.exe process pegs out ALL processors!!! Only can reboot box to get connectivity back...~
Anyone have this experience!? (really hope not...but I need help)
Have completely cycled SSB machinery (via disable/enable)...and have even stepped thru enabling one db at a time...but still very poor performance!!!
Anyone?
-mt
sp_who output here...
BACKGROUND sa . 16 NULL RESOURCE MONITOR
BACKGROUND sa . . NULL LAZY WRITER
SUSPENDED sa . . NULL LOG WRITER
BACKGROUND sa . . master SIGNAL HANDLER
BACKGROUND sa . . NULL LOCK MONITOR
sleeping sa . . master TASK MANAGER
BACKGROUND sa . . master TRACE QUEUE TASK
sleeping sa . . NULL UNKNOWN TOKEN
BACKGROUND sa . . master BRKR TASK
BACKGROUND sa . . master TASK MANAGER
SUSPENDED sa . . master CHECKPOINT
sleeping sa . . master TASK MANAGER
sleeping sa . . master TASK MANAGER
BACKGROUND sa . 16 ThompsonTractorD43 KILLED/ROLLBACK
sleeping sa . . master TASK MANAGER
BACKGROUND sa . . master KILLED/ROLLBACK
BACKGROUND sa . 16 master KILLED/ROLLBACK
sleeping sa . . master TASK MANAGER
BACKGROUND sa . . master BRKR TASK
BACKGROUND sa . 16 master BRKR TASK
sleeping sa . . master TASK MANAGER
sleeping sa . . master TASK MANAGER
sleeping sa . . master TASK MANAGER
sleeping sa . . master TASK MANAGER
BACKGROUND sa . 16 YancyMachineryCat KILLED/ROLLBACK
BACKGROUND sa . . master BRKR EVENT HNDLR
BACKGROUND sa . . master BRKR TASK
sleeping NT AUTHORITYSYSTEM REFINERY1 . msdb AWAITING COMMAND
sleeping NT AUTHORITYSYSTEM REFINERY1 . msdb AWAITING COMMAND
sleeping NT AUTHORITYSYSTEM REFINERY1 . msdb AWAITING COMMAND
sleeping NT AUTHORITYSYSTEM REFINERY1 . msdb AWAITING COMMAND
SUSPENDED NT AUTHORITYSYSTEM REFINERY1 . msdb DELETE
sleeping fastironweb DETROIT . Cat_Lvl3 AWAITING COMMAND
sleeping mike REFINERY1 . master AWAITING COMMAND
SUSPENDED NT AUTHORITYSYSTEM REFINERY1 . distribution WAITFOR
sleeping mike REFINERY1 . Cat_Cfsc AWAITING COMMAND
sleeping mike REFINERY1 . Cat_Cfsc AWAITING COMMAND
sleeping mike REFINERY1 . Cat_Cfsc AWAITING COMMAND
RUNNABLE mike REFINERY1 . Cat_Cfsc SELECT INTO
sleeping NT AUTHORITYSYSTEM REFINERY1 . msdb AWAITING COMMAND
That is a SqlException I got at a...
at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader()
Anyone an idea what THAT means? How do I cause it? How can I work around it?
Our company is in the retail business, thus, the window for processing cubes is very small during Christmas season (only 4 hours each day).
To speed things up, we have partitioned our cube at monthly level so, potentially, 12 threads can be run simultantsly. However, when I looked at DTS, I am not so sure whether or how it can accomplish that task. Has anyone tried this before or is aware of another third party tool can do the trick?
thx in adcance,
Carl.
Hi All
I have been asked by developers if there is any advantage in processing multiple clustering models simultaneously by using AMO and multiple threads as against processing one after another.
I have limited experience with Analysis Services but based on my reading I don't see this method providing any advantage.
Does anyone have any recommendations or advice? The system Enterprise Edition running on an x86 Server with 2 dual core processors and 4GB of RAM. Would the answer alter if the server running x64 version of SQL Server and Windows.
Thanks
Nadreck
Are there any draw backs to spawning additional threads inside of the script tasks for SISS packages?
View 4 Replies View RelatedI found a peculiar thing today while working with SQL Mobile in a multithreaded application (VS2005, application for Pocket PC 2003).
I created a class which has one SqlCeConnection object. Every time I call a function to insert/select/delete something from the local db, I open the connection, execute the query an then close the connection again.
But when I'm calling a function from the db class in thread 1 and in the meantime call a different function (from the same db class of course) in thread 2, things go wrong. Because when function 1 wants to close the connection, function 2 is still using the connection and it will crash my application with a native exception (0xC0000005: access violation).
I can see why the error is happening, but shouldn't there be a nice .NET handled exception instead of a native exception which grinds my app to a hold?
(A workaround I use now is to use multiple connection objects instead of one, but I thought I'd give this feedback anyway)
Recently I'm working on a multi-thread solution based on SQL-Server, now I'm facing such a problem:
Suppose I have process No.1(with multi-threads) inserting data to Table A, which has its identity column auto generated. And process No.2(also with multi-threads) retrieving data from Table A ,generate some records and insert the result into Table B. Both of these two processes are doing batch processing(batch retrieving and batch writing), and they are running parallelly.
Now since process No.2 retrieve data sequencely by the identity of Table A, it found there exists missing results. This is due to that records with bigger identities are not necessarily commited earlier than those who have smaller identities.
One direct solution is add one flag field in Table A indicating whether this record has been processed by process No.2, and each time it was processed , the field will be set. But unfortunatelly the table structure is not supposed to be modified.
So is there any other good solutions for this problem? Thanks.
Hi Guys,
I am searching for some information on achieving performance improvement by spawning multiple threads in single Stored procedure or rather say within Single Database connection. We have a batch process that updates around 200 tables and each table update takes around 2 mnts. I am trying to optimize this by running these updates in parallel rather than sequential. These all tables are mutually exclusive. I have written a stored procedure which updates these tables in loop. Concern is that every update statement waits for other to get over. I am calling this Sp from Java application. One crude way will be opening multiple connections to database each running separate T-SQL statement. It comes with lot of overhead in opening connections .Is there any way I can force explicitly in T-SQL stored procedure to spawn a new thread for every Update statement. In case I try to do same process from a Java connection.. is there a way I can open multiple threads for each statement under same database connection.
Thanks,
Vikalp