Question About Threads And SQL Licensing

Jun 16, 2006

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

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About Threads

Feb 29, 2008

How can i delete my old threads from Mythreads.

Any Body

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Jan 24, 2001

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

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Jul 21, 2004

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?

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Max Worker Threads

May 31, 2007

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?

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Jul 20, 2005

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!

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Nov 20, 1998

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Thanks a gig for your help.

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Aug 30, 2005

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Oct 10, 2007

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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...

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Jan 15, 2008

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?


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Mar 12, 2007

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

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Aug 2, 2007

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Jul 20, 2005

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Aug 22, 2007



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!

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Aug 9, 2006

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.

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Jun 21, 2007

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

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Mar 3, 2008

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Thanks,
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AS
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DECLARE @conversationGroupId UNIQUEIDENTIFIER;

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.........................
.........................
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