Executing Clustering Models On Multiple Threads
Mar 3, 2008
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
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Dec 5, 2006
Hi, all here,
Since we are not able to use accuracy chart for Clustering algorithms there. So how can we verify the accuracy of clustering algorithm models here in terms of its classification and regression tasks?
Thank you very much in advance for your guidance and advices for that.
With best regards,
Yours sincerely,
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Nov 24, 2006
Hi, all here,
Thank you very much for your kind attention.
Is there any good way to determine the number of clusters for the clustering models?
Really looking forward to hearing from you for your guidance.
Thanks a lot.
With best regards,
Yours sincerely,
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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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Dec 21, 2004
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.
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Jan 24, 2006
I 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)
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Jul 16, 2001
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
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Jul 24, 2012
we are queirying an stored procedure multiple times same time,from our application. In this case, few processes executing successfully and few getting failed with error "50000 error executing the stored procedure" and if we run thesame process again its getting executed sucessfully.Does the MySQL cannot handle multiple threads same time?
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Aug 14, 2007
Hi,
I am using distributed transactions where in I start a TransactionScope in BLL and receive data from service broker queue in DAL, perform various actions in BLL and DAL and if everything is ok call TransactionScope.Commit().
I have a problem where in if i run multiple instances of the same app ( each app creates one thread ), the threads pop out the same message and I get a deadlock upon commit.
My dequeue SP is as follows:
CREATE PROC [dbo].[queue_dequeue]
@entryId int OUTPUT
AS
BEGIN
DECLARE @conversationHandle UNIQUEIDENTIFIER;
DECLARE @messageTypeName SYSNAME;
DECLARE @conversationGroupId UNIQUEIDENTIFIER;
GET CONVERSATION GROUP @conversationGroupId FROM ProcessingQueue;
if (@conversationGroupId is not null)
BEGIN
RECEIVE TOP(1) @entryId = CONVERT(INT, [message_body]), @conversationHandle = [conversation_handle], @messageTypeName = [message_type_name] FROM ProcessingQueue WHERE conversation_group_id=@conversationGroupId
END
if @messageTypeName in
(
'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog',
'http://schemas.microsoft.com/SQL/ServiceBroker/Error'
)
begin
end conversation @conversationHandle;
end
END
Can anyone explain to me why the threads are able to pop the same message ? I thought service broker made sure this cannot happen?
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Jun 18, 2014
I have two tables called ECASE and PROJECT
In the ECASE table there is trigger to get the max value of case_id column in ecase based on project and increment one to that case_id value and insert into ecase table .
When we insert a new record to the ECASE table this trigger calls and insert the case_id column value.
When i run with multiple threads , the transaction is rolled back because of trigger . The reason is , on the project table the lock is happening while getting the max value of case_id column based on project.
I need to prevent the deadlock .
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Nov 29, 2006
I am using BI Dev Studio for SS2005 in a research (as opposed to a production) environment. Often I want to compare the results of multiple models using the same attributes. If I switch to a different model, the Design view completely resets. Is there any way to retain the same field names with different models in the Design view?
My current workaround is to give my models similar names with AR, DT, CL, LOG, NN suffixes and make global changes in the DMX.
I have consulted the following without finding an answer:
http://msdn2.microsoft.com/en-us/library/ms178445.aspx
http://msdn2.microsoft.com/en-us/library/ms175642.aspx
http://msdn2.microsoft.com/en-us/library/ms175678.aspx
http://msdn2.microsoft.com/en-us/library/ms175637.aspx
Thanks for your help,
Sam
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Jan 27, 2008
I am generating hundreds of lines of sql with a tool and wish to execute is in runtime. The sql consists of table creation, procedure creation, aswell as inserts and updates. When i try with SqlDataAdapter I get an error. Does anyone have a solution on what I can do?
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Oct 22, 2007
Hey guys,
What is the best way to run multiple sql scripts against a database.
Vendor provided a DBupdate utility but it isn't working properly.....
any suggestions....
thanks,
jonathan
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Jan 12, 2004
Hi,
I would like to execute multiple stored procs by calling a single script say A. I want to A to execute on a nightly basis. The multiple stored procs are bulk inserts into separate tables. I want to be notified of the error if one among the many stored procs fail when I call A. But if one fails, I don't want A to fail. The remaining stored procs should execute. Does anyone have a script wriiten for A? I guess A is just not about -
EXEC SP1
EXEC SP2
EXEC SP3
EXEC SP4
EXEC SP5
Thanks
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Apr 24, 2008
I am trying to execute around 3 SSIS packages using Execute package task by having all the 3 in one SSIS package,
I am getting the below error:
Error: Error 0xC001000A while preparing to load the package.
The specified package could not be loaded from the SQL Server database. .
Can I use Execute package task for this purpose??
Thanks!!
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Aug 27, 2007
I am probably missing something simple here but...
I have a CLR Stored Procedure where I am attempting to execute multiple SQL commands. Here is what happens.
Case One
1. Stored Procedure is invoked.
2. Create SQL Connection.
3. Open the connection.
4. Begin Transaction.
5. Create Command from Connection.
6. Set Command objects Transaction property to transaction created above.
7. Set Command Text Property to SQL Query.
8. Execute Query via ExecuteReader and get SQLReader.
9. Read query result set.
10. Close QueryReader.
11. Set Command Text Property to another SQL Query.
12. Execute Query
This is where I get one of two exceptions.
1. An Exception stating that I cannot have parallel transactions.
or
2. An Exception that I have an open SqlReader that must be closed.
Case Two
1. Stored Procedure is invoked.
2. Create SQL Connection.
3. Open the connection.
4. Begin Transaction.
5. Create Command from Connection.
6. Set Command objects Transaction property to transaction created above.
7. Set Command Text Property to SQL INSERT command.
8. Execute Insert command.
9. Set Command Text Property to SQL Query command.
10. Execute Query Command via ExecuteReader.
At this point the stored procedure appears to hang.
Could someone please enlighten me if I have missed something obvious while reading the manual, regarding what you can and cannot do?
Thanks in advance.
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Aug 22, 2007
HI,
We are currently trying to import the Data from one DB to Multiple DBs.And these multiple DBs connection strings must be configurable. This I can do it by reading the connection strings from dtsconfig file and execute it for each DB.Is it possible to execute for all the DBs in parallel(Multithreaded).
Thanks,
Sabari.
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Feb 27, 2007
hi,
i am making a n application which in between deletes the multiple tables from the sql database.
for that i have written the following code:
SqlCommand cmd = new SqlCommand();
cmd.CommandText = "delete from " + dbConstt.DBSchema + ".PicassoSelectivityLog where QTID=" + qtid;
cmd.ExecuteNonQuery();
cmd.CommandText = "delete from " + dbConstt.DBSchema + ".PicassoSelectivityLog where QTID=" + qtid;
cmd.ExecuteNonQuery();
in this way, many more tables are to be deleted.
is there any need to create the new SQLCommand object again and agin for each and every query. can iot be done like the given above or can there be some better method?
thanz in advance..
divya
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Oct 15, 2007
Is there a way to get the Report Manager to allow a single user to
execute more than 1 report at a time? Currently, each user can only
have a single report being executed at a time. It looks like any
other reports are being queued and executed serially.
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Feb 24, 2008
Hi,
I am executing following script which return more than 1 query/row as there are more than 1 log backup :
select @Query = 'RESTORE LOG ' + @dbName + ' FROM DISK=' + '''' +@path+''''+ ' WITH' + ' NORECOVERY, FILE= ' + convert(varchar(10),Position) from #temp where BackupName = 'Log_Backup' and BackupType = 2 and Position> @Diff_Position EXEC(@QUERY)
[Above script restores database with latest Differential backup file and latest log files. ]
Now I want to execute this, but @Query don't work for more than one row returned . Can you please suggest me how to execute such query?
Thanks,
Dipak.
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Apr 24, 2008
I am trying to execute around 3 SSIS packages using Execute package task by having all the 3 in one SSIS package,
I am getting the below error:
Error: Error 0xC001000A while preparing to load the package.
The specified package could not be loaded from the SQL Server database. .
Then I did the following:
1. Right click on MSDB
2. Import package
Inside Import package window:
Package location: SQL Server
Server: servername
authentication: windows authen
Package path: \serverC$folder1SSIS Packagesfolder2
Import package as:
Package name: package.dtsx
Below is the error I am getting:
TITLE: Import Package
------------------------------
Cannot find folder "\serverC$folder1SSIS Packagesfolder2".
Can I use Execute package task for this purpose??
Thanks!!
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Jan 3, 2005
Hi all,
Is there any way so that we can run/ execute multiple jobs or local packeges at once. Can we create any sql script which will execute multiple jobs/packeges at once. please advise
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Jul 20, 2005
Hello!We have a set of individual .SQL scripts which we would like toexecute against a MS SQL Server 2000. Is there any way to have ISQLutility (or any other means) to execute all of them without having toestablish a separate database connection for each script:isql -Ux -Py -Ss -i script1.sqlisql -Ux -Py -Ss -i script2.sqlisql -Ux -Py -Ss -i script3.sql.....isql -Ux -Py -Ss -i scriptN.sqlAll scripts are in the same location, which could be made visible toby the SQL Server itself (so either a client-based or a server-basedinvokation is ok)TIA
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Jan 2, 2008
Happy new year everyone!!!
Ok, now for my not so happy new year problem ... here's the scenario:
I have a simple task of exporting data retrieved by a parameterized stored procedure to a delimited text file ... task done in 30 mins max using dataflow task from OLE DB Source with SQL Command to Text File Destination ... thank you very much SSIS!
But the problem is the OLE DB Source executed the SP MULTIPLE TIMES (3 to be exact)
Actually configuration is:
1. OLE DB Source
2. SQL Command access mode
3. The following command written in the command text box:
SET FMTONLY OFF;
exec sp_SampleSP @param1=?, @param2=?
4. Configured parameter mapping.
The stored procedure logs to a database table everytime it is executed to report how many rows were selected (please don't crucify me with this method, i'm re-using procs from old system). The log shows that during execution of this package the SP was executed on 3 times.
Help anyone? Please ...
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Dec 28, 2007
Hi,
Can we execute multiple instances of the same SSIS package simultaneously??
If yes, how?
If no, what is the work-around to simulate such a functionality?
Thanks in advance.
Regards,
B@ns
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May 13, 2008
Hello all -
Based on advice from this board, I am setting up our newly-converted DTSX packages (sql server 2000 (DTS) to 2005 (SSIS) package conversion) to utilize package configurations to make it easier to run them in multiple environments (dev, testing, production, etc...). This seems to be working just fine, but I now have another question.
We have approximately 12 DTSX packages which need to be executed in a specific sequential order. I was wondering what the best / most widely accepted method is to allow for running them as an automated process. If you double click on each DTSX file individually, the "Execute Package Utility" pops up, and you can run the package. I'd like to know the best way for us to be able to run each package, one after the other (each one waiting until the previous one completes before it begins), until they have all processed. It would be nice if it did not rely on SQL Server being installed on the machine on which it is being run...
thanks for all the fantastic support on this site
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Nov 13, 2007
We have 2 env. : Testing and Production, both are running Windows 2003 Enterprise Server with SQL Server 2005. The difference is Testing is NOT running Windows cluster but Production do so, what is the best way to transfer a database from testing to production?
We have another systems that both testing and production are running on NON-cluster and we use backup/restore to transfer the database, can it apply in this case.
And I found that there are a tools called DTC, which can transfer all DB objects from one DB to another, is it a best way to transfer between non-cluster and cluster env.?
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Jul 20, 2005
Does anyone know of a way to execute sql code from a dynamically builttext field?Before beginning, let me state that I know this db architecture isbuilt solely for frustration and I hope to make it better soon.Unfortunately, there is never a non-crucial time in which we can do anupgrade, so we are stuck for now.Point 1:There are multiple tables: students, courses, cross-referencestudent/courses, teachers, cross-reference teacher/courses, andothers.Point 2:Yearly archiving is done by appending a 2 digit year suffix to thetable and rebuilding the table structure for the current year. Thatis, each of the tables named above has an archive table for 1999,2000, 2001, etc. This leads to many tables and a big mess whenunioning them.Point 3:A history report is run by building a big query that unions each unionof tables (students, courses, etc) by year. This query has grown toobig for a varchar(8000) field. Actually, it's too big for 2 of them.Point 4:I don't want to write code to maintain any more varchar(8000) fieldsfor this query. It should be much more easily handled with atemporary table holding each bit of yearly archive data. I have builtthis and it works fine. I have also figured out how to pull the rowsfrom that table, concatenate them, and insert the resulting lump intoa text field in another table.Point 5:I haven't figured out how to grab the 5 or so records from that tableand execute them on their own. I figured I could grab them, put theminto a text field that's big enough to hold the whole query and thenselect and execute that text field. I've had no luck with that and Ihaven't had any luck finding any references that might help me withthis problem. I keep thinking of nesting execute() calls, but thatdoesn't work.I'm open to questions, potential solutions, hints about different wayto approach the problem, anything.Many thanks in advance,Rick Caborn
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May 12, 2008
Hi
I am newbie in SQL Clustering. I have set up a Windows Server Cluster with 2 nodes and am having the following problem with Physical Disk resource for cluster groups:
My Default Cluster Group (named Cluster Group) has IP Address, Network Name, Physical Disk and MSDTC resources. In addition to that my Default SQL Server instance resources are also in this group. I had this initial set up for Active/Passive mode.
Now I am trying to set up a SQL Cluster in Active/Active mode. For this I have to install another instance of SQL Server in the existing cluster and make a separate cluster group for its resources. I made a new cluster group (SQL Instance Group) with an IP Address and a Network Name resource for this new instance but I dont have any Physical Disk resource to allocate to it. As such while installing the SQL Server Instance I get stuck when I'm asked to select the quorum disk to be used.
Is it possible to configure two quorum disks, one for each group?
What's the concept of dedicated disks resource for each sql instance in a group? Is this same as the quorum disk? If this is not a shared disk how do I configure a dedicated disk resource for my second cluster group (SQL Instance Group)?
Anyone could please help me out with this?
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Jan 30, 2015
I am trying to create a logon trigger. As I am testing this, I discovered that each time I do a connection, I get 19 rows, inserted into my audit table. I ran profiler, and I see it is going through the logon trigger multiple times, for a single connection. So, what am I doing wrong? The code is fairly simplistic, and the profiler doesn't give a clue, as to what is going on. When I look at the output, I see the spid for the first couple of connections are different, then a spid, that is different from those 2 is in the next 17 rows. But, when I do an sp_who2, that spid does not exist.
This issue was noticed on a 2012 version, that I was first testing on, then had the same issue on a 2008 R2. I am currently testing on a 2014 version, that is doing the same thing. Is the logon trigger itself, firing, and causing this?
I also tried using the After Logon option, and got the same issue.
Here is the code:
CREATE TRIGGER LogonAuditTrigger
ON ALL SERVER WITH EXECUTE AS 'sa'
FOR LOGON
AS
BEGIN
DECLARE @Body NVARCHAR(2000),
[code]....
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Feb 29, 2008
How can i delete my old threads from Mythreads.
Any Body
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Jan 24, 2008
Hi,
I have a web application using Stored Procedure (SP). I see that there's a SP taking long time to execute. I try to capture it by Profiler Tool, and find out that with the same SP on the same db with the same parameter. The duration of executing by my web app is far bigger than the duration of executing on SQl server management studio - query window
Please see the image through this url http://kyxao.net/127/ExecutionProblem.png
Any ideas for this issue?
Thanks a lot
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