SQL Server Multi-threading
Nov 8, 2007
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
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Nov 23, 2005
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
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Aug 23, 2006
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.
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Jun 22, 2006
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
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Jan 28, 2004
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
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Apr 11, 2008
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?
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Aug 29, 2007
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
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Jun 3, 2002
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?
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Mar 27, 2007
I am new to Reporting Services and hope that what I am looking to do is within capabilities :-)
I have many identical schema databases residing on a number of data servers. These support individual clients accessing them via a web interface. What I need to be able to do is run reports across all of the databases. So the layout is:
Dataserver A
Database A1
Database A2
Database A3
Dataserver B
Database B1
Database B2
Dataserver C
Database C1
Database C2
Database C3
I would like to run a report that pulls table data from A1, A2, A3, B1, B2, C1, C2, C3
Now the actual number of servers is 7 and the number of databases is close to 1000. All servers are running SQL2005.
Is this something that Reporting Services is able to handle or do I need to look at some other solution?
Thanks,
Michael
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Sep 29, 2005
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?
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Aug 9, 2006
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?
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Apr 29, 2008
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
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Jul 10, 2015
If 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.Â
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?
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Dec 22, 2006
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
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Sep 23, 2014
Disaster Recovery Options based on the following criteria.
--Currently running SQL 2012 standard edition
--We have 18000 databases (same schema across databases)- majority of databases are less than 2gb-- across 64 instances approximately
--Recovery needs to happen within 1 hour (Not sure that this is realistic
-- We are building a new data center and building dr from the ground up.
What I have looked into is:
1. Transactional Replication: Too Much Data Not viable
2. AlwaysOn Availability Groups (Need enterprise) Again too many databases and would have to upgrade all instances
3. Log Shipping is a viable option and the only one I can come up with that would work right now. Might be a management nightmare but with this many databases probably all options with be a nightmare.
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Aug 17, 2015
More often than not, I typically don't touch DTC on clusters anymore; however on a project where the vendor states that it's required. So a couple things here.
1) Do you really need DTC per instance or one for all?
2) Should DTC be in its own resource group or within the instance's group?
2a) If in it's own resource group, how do you tie an instance to an outside resource group? tmMappingSet right?
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Feb 4, 2008
the stored procedure don't delete all the records
need help
Code Snippet
DECLARE @empid varchar(500)
set @empid ='55329429,58830803,309128726,55696314'
DELETE FROM [Table_1]
WHERE charindex(','+CONVERT(varchar,[empid])+',',','+@empid+',') > 0
UPDATE [empList]
SET StartDate = CONVERT(DATETIME, '1900-01-01 00:00:00', 102), val_ok = 0
WHERE charindex(','+CONVERT(varchar,[empid])+',',','+@empid+',') > 0
UPDATE [empList]
SET StartDate = CONVERT(DATETIME, '1900-01-01 00:00:00', 102), val_ok = 0
WHERE charindex(','+CONVERT(varchar,[empid])+',',','+@empid+',') > 0
TNX
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Jul 20, 2005
Hello,I am trying to construct a query across 5 tables but primarily 3tables. Plan, Provider, ProviderLocation are the three primary tablesthe other tables are lookup tables for values the other tables.PlanID is the primary in Plan andPlanProviderProviderLocationLookups---------------------------------------------PlanIDProviderIDProviderIDLookupTypePlanNamePlanIDProviderStatusLookupKeyRegionIDLastName...LookupValue....FirstName...Given a PlanID I want all the Providers with a ProviderStatus = 0I can get the query to work just fine if there are records but what Iwant is if there are no records then I at least want one record withthe Plan information. Here is a sample of the Query:SELECT pln.PlanName, pln.PlanID, l3.LookupValue as Region,p.ProviderID, p.SSNEIN, pl.DisplayLocationOnPCP,pl.NoDisplayDate, pl.ProviderStatus, pl.InvalidDate,l1.LookupValue as ReasonMain, l2.LookupValue as ReasonSub,pl.InvalidDataFROM Plans plnINNER JOIN Lookups l3 ON l3.LookupType = 'REGN'AND pln.RegionID = l3.Lookupkeyleft outer JOIN Provider p ON pln.PlanID = p.PlanIDleft outer JOIN ProviderLocation pl ON p.ProviderID = pl.ProviderIDleft outer JOIN Lookups l1 ON l1.LookupType = 'PLRM'AND pl.ReasonMain = l1.LookupKeyleft outer JOIN Lookups l2 ON l2.LookupType = 'PLX1'AND pl.ReasonSub = l2.LookupkeyWHERE pln.PlanID = '123456789' AND pl.ProviderStatus = 0ORDER BY p.PlanID, p.ProviderID, pl.SiteLocationNumI know the problew the ProviderStatus on the Where clause is keepingany records from being returned but I'm not good enough at this toanother select.Can anybody give me some suggestions?ThanksDavid
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Oct 6, 2015
I am setting up SQL 2014 always on. I was able to set up the replicas between 2 servers in the same subnet.Their IP addresses are say like this:
100.20.200.200
100.20.200.201
When I am trying to introduce another node into the cluster which has IP address like 100.10.101.102, I am getting an error that the server isn't reachable.
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Jun 3, 2015
As CM doesn't support SQL authentication, and if access SQL Server on another domain with no trust, we cannot use Windows authentication as well.
CM only supports Windows authentication, but for large organizations which will have multi domains.
I am thinking if there is no proper way/tool, we will develop one then.
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Oct 9, 2006
hi,consider this:i have american users in a db called "user" in a server called AMERICAand rest of the world users in a db called "user" in a server called OTHERhow can i do a join betwhen American's users and Rest of the word's User db?
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Jun 17, 2007
Hello,I am working on an Access VBA application, working in client/servermode, with a shared SQL Server base.I have to INSERT some data in the base, and the know what is the IDthat SQL Server associated with my data in the table. So I need to dothe followingINSERT data INTO TABLESELECT MAX ID FROM TABLE (to get the ID)but since I am working in client/server, if some DATA has been insertedby another client after my INSERT, then MAX ID is not the convenientID of my data ...Is there a way for me to get the ID when I do the INSERT, or tolock/unlock the table before the INSERT and after the SELECT ?Thank you for any hint about that.--L'ordinateur peut faire plus de calculs que le cerveau de l'homme caril n'a que ça à faire
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Aug 22, 2007
What is the effect of deploying Multi-Server instance on performance?
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Oct 1, 2007
We are currently managing about 75 SQL Server instances. Each instance contains jobs (backups, index work, admin, etc) which report back to a central instance for monitoring. This is working well, but each time I need to change one of the jobs, I am having to log into each instance to do so.
I have recently played with Multi-server Environment, using a master and target, to see if this might help. There is relatively little written about Multi-server in books-online, and I am left with a question.
All jobs appear to be exact duplicates. But I don't want exact duplicates. For example, on the various target servers, I would like for the backup jobs to run at different times, and write to different directories. How are the rest of you working around this situation, if you are using Multi-server Environment?
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Oct 12, 2000
Can anyone help me how to extract data from two different SQL servers? Both the servers are alredy registered on my local machine.I need to select data from one database on Server1 and insert the same in a table in another database of Server2.Names of the servers are abc-efg-hij and 143.89.55.67.
Thanks for any help!
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Jan 6, 2004
My company uses a quad processor server connected to a SAN to load and summarize detail sales information from 2000 stores on a nightly basis. We poll and load around 5,000,000 rows of data each night. THis information is summarized up to various levels, then replicated to one or more secondary datamart servers for end user access via web reporting, BI tools like Proclarity/Analysis Services etc...
The initial data polling server is only touched by the development staff supporting the process (1-5 programmers) and is licensed for SQL server Enterprise using a CAL model. Each datamart server is licensed with MS SQL server processor licenses.
The question: We were told that the quad processor polling machine, which has no end user access allowed, must be licensed with processor licenses since it touchs the data ultimately consumed by end users. This makes no sense to me.
The Microsoft white papers discussing multi_tier environments don't seem to address this type of issue. They focus on applications that ultimately pass thru a data request to the SQL server machine. In this situation, user requests are handled by the datamart servers, which are licensed with processor SQL licenses.
Can anyone clarify?
Thanks, Mike
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Jan 17, 2008
Hi,
This is chirag patel.
we are going to develop web application which can disply data (Search Results) in different language.
if user selected country Japan, then search results should be in Japanese.
if user selected country Chian, then search results should be in Chinese.
now i want to store all these read only data in Database. how and where i can store it?
do i need to have different Databases? or with single database also i can achive?
I means what is advisable approach to achieve this?
if Single Database for all countries then how i can store same data in different languages in single table?
please guide me if anyone know how to achive such kind of scenario in SQL Server?
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Jul 4, 2007
We have a setup with a web server and multiple databases, and a live, stage, and dev environment. We use SQL Server standard 2005 and use the ASP.NET ReportView control. I have spent countless hours now trying to get this to work and am about to give this up and go back to Crystal.
First I wanted a report that would work from dev to stage to live without modification, so we set up shared data sources on each environment to point to the appropriate database. No problem, I can publish it to each environment and it works, though sometimes I have to go into Report Manager and fix the data source.
Next I wanted to be able to work with multiple databases, identical in structure. For this we did a hidden parameter with the database name and used a formula for the query string. This works pretty well.
Next I wanted to be able to run against multiple database servers from a single web server. This has been nearly impossible. I've read a million posts about this, and nothing seems to work well. I've tried a dynamic connection string, and passing the server in as a parameter, but this doesn't work, because I can't get the credentials set on the ReportViewer.ServerReport, so it doesn't work from dev to stage. You can't programatically change the shared data source - that would make it too easy. Linked servers are not an option.
I guess I need to either publish a copy of the report for each database server, or set up an instance of SQL on the web server for each database server.
Any other reasonable options out there. I just can't imagine my setup is all that unique.
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Jun 8, 2007
I get this error in a web farm environment:
Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.
I googled and found a bunch of references to .NET apps, but I wasn't sure how to fix it in SSRS.
Has anyone else experienced this?
Thanks!
BobP
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Sep 28, 2007
Hi All!
I setup MS SQL Server 2005 first and then I setup MS SQL Server 2000 with instance 'Myname' and the I created 2 database in SQL Server 2005 and 2000, When I Write an application in .NET 2005 to connect to MS SQL Server 2005 it ok, but it's not ok in sql Server 2000 and appear the error:
System.Data.SqlClient.SqlException: Snapshot isolation transaction failed accessing database 'TustenaOS' because snapshot isolation is not allowed in this database. Use ALTER DATABASE to allow snapshot isolation. at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async) at
How to connect to MS SQL Server 2000. Thanks
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Apr 21, 2008
While attempting to script out some multi-server jobs I am receiving this error:
TITLE: Microsoft SQL Server Management Studio
------------------------------
Script failed for Job 'my job name'. (Microsoft.SqlServer.Smo)
For help, click: <link removed to keep message width to a normal size :)>
------------------------------
ADDITIONAL INFORMATION:
Unable to cast object of type 'System.DBNull' to type 'System.String'. (Microsoft.SqlServer.Smo)
------------------------------
BUTTONS:
OK
------------------------------
This happens on any multi-server job. The reason behind needing to script this is the current database server that acts as our master server for SQL Server jobs is being replaced. I figured it would be easy enough to script out the job on the old server and run it (with minimal modifications) on the new server. Now, if I create any of these jobs manually on the new server and try to script it, it works just fine. Any ideas what might be the issue here?
I've tried doing it via SSMS from multiple servers and the issue persists.
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May 22, 2008
I would appreciate help on how to setup database on server B when SQL Server is located on server A of a multi-server network. I am a novice.
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Mar 27, 2008
I am new to SQL Server but have been using Access to provide Multi-User acces to a central data store. We are evaluating the replacement of Access with SQL Server. With Access we don't need any special installation; I believe that the Jet Database Engine installed locally on each user's PC allows them to work with this in a disconnected manner; we use ADO.net 2.0 with VB.net 2005.
If each user has a locally installed SQL Server Express can they all attach to a database that resides on a shared network location?
In another post on the Forum I see the following regarding multi-user access:
Our application You will need to pick a central computer that everyone will be using the access the data and attach the file to the parent instance of SQL Express on that comuter, giving it a name that you can use to access it. Then you will need to modify your connection string to connect to the named database on the central server...
Can multiple locally installed SQL Server Express instances attach to a single data store that resides on a shared network location?
If not, what permissions do I need to create a parent instance of SQL Server Express?
Thank you for helping me understand how to implement our solution.
JudiR
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