I have some threading questions, please explain how these work. Thanks!!
How do the threads get created (programmatically, network, or through sequel)?
If I have 10 people in an application, is a thread created for each user?
If I run a large process can I subdivide the process and run it through mulitple threads?
Ello,
We have quite a few SQL Servers running on servers with hyper threaded enabled processors. We have always left hyper threading on, even on our very busy servers but i've recently begun to question this due to comments i have received.
All our servers run SQL 2000 SP3a as "support" for hyper threading was added in SP3a
So... What do you think of Hyper Threading any why?
Over some time now, I've been developing a fairly hefty stored procedure, that does a lot of computations, and fairly few table lookups.
When I look at the performance on my server (a dual Xeon HT) I can see that it only uses 1 out of 4 possible "cpus" to work on the calculations, while the three others idle out, and was wondering if I can somehow force it to use max available CPU power?
I have a vb 2005 app that executes a SSIS package in threads.
The SSIS package imports a large (20mb) file, does many alternation to it, exports it to the database.
The SSIS execution is quite frequent and there for multi-threading is needed.
Here is the issue:
If i take out the threading everything works great. The second that i add threading, and try to execute a few instances of the SSIS it starts crashing. The thing is that it errors out in different task and is completely unpredictable.
My question:
1) Can SSIS be used in a multi-threading environment?
2) If yes, How do i do it?
3) Does anyone have any suggestion as to what i should try?
p.s. Timing is definitely an issue for me. I got to get this working, tested, approved by 8/27/2006
---------
here are the 3 errors that i'm getting when i turn multi-threading on
1)Thread "WorkThread0" has exited with error code 0xC0202009.
2)An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80004005 Description: "Transaction (Process ID 112) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.".
3)The ProcessInput method on component "(i cannot display the name of the task for security reasons" (448) failed with error code 0xC0202009. The identified component returned an error from the ProcessInput method. The error is specific to the component, but the error is fatal and will cause the Data Flow task to stop running.
Apologies if this is not the right forum.
We have some c~ code which calls a stored proc to trnsfer data from one db to another.
We are using multi threading to allow a whole days data to be processed in parrallel.
However, we are experiencing problems. After a while we get the following message:
"An exception during changed data captured caused all processing threads to abort".
Can anyone tell me what posssible reasons would cause this to happen?
It is not an area in which I have a lot of expertise, the code was written by a third party.
Many thanks
We're moving in a 4-socket (Xeon Dual Core CPU's) server. What version and product of SQL Server should I be looking for to fully take advantage of the new server's 4 processors. I'm not sure I understand the licensing per CPU. Is there any advantage in waiting for SQL Server 2008 as it concerns multi-threading and what should I be looking to spend for a SQL server solution that utilizes all four processors. Someone has told me that the SQL Server standard edition comes with 4 cpu licenses. Is this correct?
Thanks, Rob Huylo
Rob21379@aol.com
hi,
I want to execute two user created stored procedures in a multithreaded manner in ms-sql server . Can some tell me how i can do that.
Thanks in advance.
Regards,
Manpreet
I have an SSIS package that is running the same set of stored procedures on about 50 remote database servers and importing the data through data flow tasks into a local database.
To do this I have a db table set up with the remote server and db names and using variables, i am looping through each one and getting the data. Everything works wonderfully...however, I need to find a way to be able to run multiple calls at the same time. Is it possible to multithread SSIS so that I can run 1 server retrieval on 1 thread and another retrieval on another thread? Any other suggestions on how to optimally do this?
All,
We are experiencing some problems when running the same package on multiple threads of a C# application concurrently. The package instances seem to share a Dts.Variables collection.
I have created a test application and package to reproduce the issue. The package is very simple. It has two variables - Instance (Int32) and Content (string). The test application runs two concurrent threads that run through 25 iterations running the package. Each thread loads the package, sets the instance, and then runs the package. The package then takes the instance, sticks it in the Content variable and then writes it to a file called "FileX" where X is the Instance. Thread 1 sets the instance from 1 to 25, thread 2 sets it from 26 to 50. The test execution results in about 15% of the files containing the incorrect "instance content". That is, I'll see "42" in the file named "File14", or something along those lines. This tells me that the variables are being overwritten.
I ran another test where I created a copy of the package, so the code is identical, but the VersionGUID is different. Running the thread test application always succeeds. There is no file name/content mismatch. I then ran another test where I manually edit the XML of the package to change the VersionGUID before the package is loaded (by calling LoadFromXml). Again this never fails.
Changing the VersionGUID may work for us, but it is a total hack. Has anyone else experienced this or have any other solutions? Any thoughts on manually updating the VersionGUID to get around this problem? I hate doing this, but we are getting desperate.
Thanks in advance,
Rob
Hi,I have SQL SERVER 2000 SP4 Enterprise , Windows 2003Enterprise onXeon 4 Processors (now with multi-threading CPU) and I havequestions whichseem weirds to me (used to have the same config withoutMulti-Threading) as following:1. SQL Server see 8 CPUs. Is this because ofmulti-threading CPUs ?2. when use SP_WHO2 ACTIVE ,2.1 Result has user SPID , which blockitself(it is UPDATE and SELECTstatements, most often)2.2 Result has user SPID , show morethan one result rows withthe same processe and command3. when use Properties of SQL Server , it has anerror 15407 in log.many thanks in advanceNiponW
View 2 Replies View RelatedIf I have several stored procedures, all of them making inserts/updates to the same tables, what is the safest way to run them in sequence?
The context is an asp.net application; I have an aspx page where a click on a button (or more) will launch stored procedures in execution. I have encountered the unfortunate situation before, when stored proc #2 started long before stored proc #1 finished and this caused problems.
If I group all stroed procs in one that simply calls all of them in the needed sequence:
exec stproc1
exec stproc2
.....
exec stprocn
Will they execute in a single thread? Is there any guarantee that stproc2 will be executed when stproc1 finishes, and so on?
I have a question:
Is SQL Compact Edition safe to use in ASP.NET WebApps?
And second if so, should i use transation isolation level or row locking hints to assure data quality during iniserts?
E.g. i want to assure that there is only one record named user2@domain2 and thus i want to make sure that my code
will not fail in a mutli-theaded scenario and insert second one or get a key exception back: see sample
transaction or locking hit{
select from users ....
if no user found
insert into users
}
Thanks
Tim
I've seen a few posts in the MSDN documentation (see links below) stating that the MergeSynchronizationAgent no longer requires the STA threading model in SQL Server 2005 SP1. However, I'm still receiving the following exception message in my synchronization code (where it attempts to access the SynchronizationAgent property):
The MergeSynchronizationAgent class must be instantiated on a Single-Threaded Apartment (STA) thread.
I have Service Pack 1 for SQL Server 2005 installed on both my server as well as my local client (the client is running SQL Server 2005 Express). How can I verify the correct files are there (e.g. are the some specific date/time values for the RMO/COM objects?
Here's the list of MSDN links mentioned above:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=326837&SiteID=1
http://msdn2.microsoft.com/en-us/library/ms146869.aspx
http://msdn2.microsoft.com/en-us/library/microsoft.sqlserver.replication.mergesynchronizationagent.aspx
http://msdn2.microsoft.com/en-us/library/microsoft.sqlserver.replication.mergepullsubscription.synchronizationagent.aspx