Calling Asynchronously
Mar 7, 2008
In my shared hosting environment where I am making large volumes of database calls, I am very anxious to preserve my heavily throttled threads-I presume when I make a database call, that it is going to a separate server and any threads that server may be using are in addition to my " hosting plan ".
My question (s) is, is it therefore a no-brainer to always make calls to:Dim oResult As IAsyncResult = iDBCmd.BeginExecuteReader()
arWaitHandles(0) = oResult.AsyncWaitHandle
iIndex = WaitHandle.WaitAny(arWaitHandles, 60000, False)
i.e. run all calls to the database asynchronously?
Is it really releasing a thread back to my asp.net App while it is waiting? (I.e. Is it worth doing)
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Sep 18, 2007
I'm assuming it's possible to call a web service asynchronously from a SQL CLR function, is this correct or is there a fundamental flaw in calling the asynchronous methods?
I've tried coding a sample and despite creating a new thread, which in turn calls the web service asynchronously and using newthread.join I can never get the webmethodasync_completed sub to be called.
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May 23, 2008
All -
I am using SQL Server 2005 and I have an endpoint that exposes some stored procedures as web-methods in the endpoint.
One particular stored procedure I have exposed takes a long time to execute: about 10 - 15 minutes. While, it is OK, that this stored procedure takes this long, it is not desirable for the HTTP Request that executed this proc to not wait for that long.
What I want to be able to do is to call the stored procedure and have the call return immidetaly but the stored proc continues what its doing. I will call another stored proc at a later time to retrive the result of the first stored proc. The first proc will store its results in a temp table. I am thinking of using SQL Server Service Broker to achieve this.
Is there a better a way to achieve this? And how does SQL Server process the Service Broker requests, i.e., I dont want the query to be executed when the server is busy. Are there any hints that I need to give to Service Broker to be able to do this?
Thanks.
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Jan 10, 2008
I have a lengthy stored procedure that does archiving that I'd just like to start and let it run, quickly returning control back to the ASP.net web page. To accomplish this my research shows that I should be passing the "adAsyncExecute" option but all of the examples I've been able to find don't jive with the way I execute stored procedures. Shown below is the code I'm using. How would I introduce "adAsyncExecute" ? public static int DoStoredProcedure(SqlConnection aConn, string procName, params SqlParameter[] theParams) { int retVal = 0; SqlCommand aComm = new SqlCommand(procName, aConn); aComm.CommandType = CommandType.StoredProcedure; foreach(SqlParameter aParam in theParams) { aComm.Parameters.Add(aParam); } SqlParameter returnValue = aComm.Parameters.Add("@ReturnValue", SqlDbType.Int); returnValue.Direction = ParameterDirection.ReturnValue; try { aConn.Open(); aComm.ExecuteNonQuery(); retVal = (int) returnValue.Value; } catch(Exception ex) { Debug.Fail("Error running SQL Query: " + ex.Message, "DBTools.DoStoredProcedure"); throw; } finally { aConn.Close(); } return retVal; }
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Sep 14, 2007
I'm working with ADO 2.8 en C++ with Visual Studio 2005. I want to perform a "select" in asynchronous mode. I don't really understand the logical of the recordset events. For example, I received a number of MoveComplete event higher than the number of rows in my recordset. It is really not clear for me ...
Does someone knows where I can find a a good example of C++ (or VB) code to manage select statements in asynchronous mode ?
Thanks in advance for your help.
François.
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Apr 30, 2001
Within a stored procedure, is it possible to call multiple other stored procedures asychronously? For example, I'd like to execute both local and remote stored procedures, but don't want/need to wait for the output while the original stored procedure continues to execute each subsequent command.
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Mar 19, 2008
I have a checksum calculation as a persisted, indexed computed column on a temporary table that I used to compare against original records to detect changes.
It seems that the update/ insert statements in my procs get out of sync on larger tables (500,000 rows +) with the checksum calculations. The only thing I can think of is that the column calculations are performed asynchronously in relation to the updates/ inserts. This is a problem for me.
Is my assumption correct? If it is, how can I adjust for this, i.e., force the computations to be performed synchronously or wait for the computations to complete before running comparisons?
-Jeremy
___________________________
Geek At Large
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Feb 22, 2008
Is it possible to execute a child package from a parent package ashnchronously.
I have a SQL Server table containing a list of packages to execute. I want to create a master package that will query this table, and execute each of the packages asynchronously.
I've tried using the Execute Package task and also executing packages programtically from a Script task, but these only seem to work synchronously.
I have also seen suggestions about executing packages asynchronously from T-SQL by starting a job, however, I'd rather not have to dynamically create jobs for each package I want to execute.
Any ideas would be welcome. Or even an answer of "No this is not possible".
Thanks in advance
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Mar 19, 2008
I have a checksum calculation as a persisted, indexed computed column on a temporary table that I used to compare against original records to detect changes.
It seems that the update/ insert statements in my procs get out of sync on larger tables (500,000 rows +) with the checksum calculations. The only thing I can think of is that the column calculations are performed asynchronously in relation to the updates/ inserts. This is a problem for me.
Is my assumption correct? If it is, how can I adjust for this, i.e., force the computations to be performed synchronously or wait for the computations to complete before running comparisons?
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Mar 28, 2007
Question is in the subject.
The reason I'm asking is because I want a workaround to a problem that a guy is having here:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1404349&SiteID=1
-Jamie
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Sep 12, 2007
if service broker is not an option, how can the trigger and sp(s) called by our trigger act asynchronously to the event that fired the trigger in the first place. We are more concerned with the original event being committed than the actions that follow via the trigger.
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May 30, 2015
I have about 30 different reports that I want to pull into a dashboard. I need to make sure that they don't execute in serial to get good performance.
There are two ways I can approach it
1) I can create a stored procedure for each report and then make sync calls for each of the reports from the web site. So, basically this will be controlled from the web end.
2) I can do this from the SQL Server database, if there is someway to execute these stored procedures in parallel.
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Oct 14, 2007
I am calling a stored procedure (say X) and from that stored procedure (i mean X) i want to call another stored procedure (say Y)asynchoronoulsy. Once stored procedure X is completed then i want to return execution to main program. In background, Stored procedure Y will contiue his work. Please let me know how to do that using SQL Server 2000 and ASP.NET 2.
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Oct 25, 2006
Hi all, i have a DTS package that i call from a C# app, i had it working great until i decided to use an activeX script to do the data transformations instead of the row copy. I need to use ActiveX to add a standard name to the last column in the destination table. the problem is the task is executing without errors (from c#) but nothing is happening, its failing silently. If i modify the Data Transformation back to a standard column mapping (with separate DTSTransformations for each column) it works fine, but as soon as i use activeX to handle the transformations it doesn't work. Can anyone tell me what i may be doing wrong. heres the calling code from C# if(f.Name.Substring(13,7).ToLower() == "product")
{
try
{
activity.Log("Starting Product DTS Package...");
DTS.Package2Class package = new DTS.Package2Class();
object pVarPersistStgOfHost = null;
package.LoadFromSQLServer(
"192.168.8.8",
"username",
"thepassword",
Microsoft.SqlServer.DTSPkg80.DTSSQLServerStorageFlags.DTSSQLStgFlag_Default,
null,
null,
null,
(string)ConfigurationSettings.AppSettings["productDTSPackage"],
ref pVarPersistStgOfHost);
package.GlobalVariables.Item(1).Value = f.FullName.ToString();
package.Execute();
package.UnInitialize();
//force release of COM object
System.Runtime.InteropServices.Marshal.ReleaseComObject(package);
package = null;
}
catch(Exception e)
{
activity.Log(string.Format("Failureprocessing {0}",WorkingPath + f.Name) +" - "+ e.Message);
} and the activex i tried to use for the transformations is: '**********************************************************************' Visual Basic Transformation Script'************************************************************************' Copy each source column to the destination columnFunction Main() DTSDestination("Yesmail Id") = DTSSource("product series") DTSDestination("Customer CKM CustId") = DTSSource("product family") DTSDestination("Product SKU") = DTSSource("transaction date") DTSDestination("product model name") = DTSSource("serial number") DTSDestination("serial number") = DTSSource("product model name") DTSDestination("transaction date") = DTSSource("Product SKU") DTSDestination("product family") = DTSSource("Customer CKM CustId") DTSDestination("product series") = DTSSource("Yesmail Id") DTSDestination("fileName") = DTSGlobalVariables("sourceFile").Value <-- this is why im using the activex for this field to get a Global Variable. Main = DTSTransformStat_OKEnd Functionthe weird thing is the PACKAGE runs fine from ENTERPRISE MANAGER with this activex, it just doesn't do it from my Calling app, perhaps i have missed something i need to change in the package constructor? BTW: i do have my assembly signed in C# for the COM wrapper.thanks in advance, mcm
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Jan 6, 2008
Hello,
I have done extensive work with Classic ASP for 9 years now. Working with Stored Proceedures etc
However now am working in c# am adviced by a friend that its best to use the
1. The "Object data source" to call SP
2. Are there any documentations pointers on best practices, how its done ?
I want to use the "on click event" in my class file.
thanks
Ehi
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Jan 9, 2008
Hello,
are there any sample codes that show you how to execute a SP in .net
1. Using a class
2. Calling the class in the onlick_button function ?
thanks
Ehi
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Jan 20, 2004
I'm developing a new Stored Proc that will be taking information in to enter customer and order info. Looking at the current Stored Proc its using alot of If statements and I'm thinking of breaking the sp up into different Stored Procs and calling them all from One main stored proc. I know how to do this but I was wondering how it would effect performance. So should I simply keep all the stuff in one proc or module it out into multiple ones to make it easier to follow and read?
Thanks
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Sep 18, 1998
Does anyone have an example of a Stored Procedure calling
another stored procedure and passing it parms.
What I would like to do is: Have a stored procedure select
data from a table and pass that data to another stored
procedure.
Thanks in advance,
Rodney
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Sep 14, 2007
Hi,
Can I call SP in the Trigger? Googled for this but din gt any satisfactory answer.
Thnkx,
Rahul Jha
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Mar 26, 2008
I'm working in SQL Server 2005. I have an existing SP that does exactly what I need (it's the aspnet_UsersInRoles_IsUserInRole SP). I want to reuse this SP and use it's return value as a field in the SP I'm writing. How do I go about doing this? I could take the logic out of the called SP and wrap it in a function; but, I would really like to reuse the SP aspnet_UsersInRoles_IsUserInRole. Thanks in advance for any assistance.
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Jan 8, 2007
hi,
i'm trying to call a dts package from vb.net.
i got 2 examples which both don't work.
first one gives me a [DBNETLIB][ConnectionOpen(Connect()).]SQL Server does not exist or access denied error.
source code:Dim serverName As String = "SERVERNAME"Dim oPackage As New DTS.Package()Dim oStep As DTS.StepDim pVarPersistStgOfHost As Object = Nothing
oPackage.LoadFromSQLServer(serverName, "USERID", "PASSWORD", DTSSQLServerStorageFlags.DTSSQLStgFlag_Default, _ "DTSPASSWORD", Nothing, Nothing, "DTSPACKAGENAME", pVarPersistStgOfHost)
For Each oStep In oPackage.Steps oStep.ExecuteInMainThread = TrueNext
oPackage.Execute()
Dim err As LongDim source, description, message As StringFor Each oStep In oPackage.StepsIf oStep.ExecutionResult = DTSStepExecResult.DTSStepExecResult_Failure Then oStep.GetExecutionErrorInfo(err, source, description) message = String.Format("ErrorCode: {0}, Source: {1}, Description: {2}", err.ToString(), source, description)Else message = "Success"End IfNext
oPackage.UnInitialize()oPackage = Nothing
second example tries to create a dts package dynamically. this time i get the error that the CustomTask can not be casted, somehting about the QueryInterface.
source code:Dim oPackage As New Package2()Dim oConnection As Connection2Dim oStep As Step2Dim oTask As TaskDim oCustomTask As BulkInsertTask
oConnection = oPackage.Connections.[New]("SQLOLEDB")oStep = oPackage.Steps.[New]()oTask = oPackage.Tasks.[New]("DTSBulkInsertTask")oCustomTask = CType(oTask.CustomTask, BulkInsertTask) <-- error
With oConnection .Catalog = "CATALOG" .DataSource = "SERVERNAME" .ID = 1 .UseTrustedConnection = True .UserID = "USERID" .Password = "PASSWORD"End With
oPackage.Connections.Add(oConnection)oConnection = Nothing
With oStep .Name = "InsertGemal" .ExecuteInMainThread = TrueEnd With
With oCustomTask .Name = "InsertGemal" .DataFile = "D:ImportGemal.dat" .ConnectionID = 1 .DestinationTableName = "Gemal" .FieldTerminator = ";" .RowTerminator = "
"End With
oStep.TaskName = oCustomTask.Name
With oPackage .Steps.Add(oStep) .Tasks.Add(oTask) .FailOnError = TrueEnd With
oPackage.Execute()
oPackage.UnInitialize()oPackage = Nothing
any help highly appreciated!
t.i.a.,ratjetoes.
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Feb 22, 2007
Hello,
I am trying to call a SQL Function in C#, as I want to get the value binded back to the column in a datagrid.
Any answers will be appreciated ...............Urgent.
:)
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Jan 17, 2008
Hello,
I have the class below. And trying to execute it on a button click event.
What am i doing wrong ?
Thanks
Here is the button click event1 protected void Button1_Click(object sender, EventArgs e)
2 {
3 signup_data_entry signup = new signup_data_entry();
4 signup.signup_data_entry();
5
6 }
Here is my class file. please advice
1 public class signup_data_entry
2 {
3 public signup_data_entry()
4 {
5 //SqlConnection con = new SqlConnection("cellulant_ConnectionString");
6 SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["cellulant_ConnectionString"]);
7
8 SqlCommand command = new SqlCommand("Cellulant_Users_registration", con);
9 command.CommandType = CommandType.StoredProcedure;
10
11 con.Open();
12
13 //string IP = new string();
14
15
16 command.Parameters.Add(new SqlParameter("@RegionID", SqlDbType.Int, 0, "RegionID"));
17 command.Parameters.Add(new SqlParameter("@RegionDescription", SqlDbType.NChar, 50, "RegionDescription"));
18
19 command.Parameters[0].Value = 4;
20 command.Parameters[1].Value = "SouthEast";
21
22 int i = command.ExecuteNonQuery();
23
24
25 }
26 }
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Feb 8, 2008
Hi All,
I have problem in calling the SP from ASP.NET application
@DefApp nvarchar(255)= '' ,@DefBusFunction nvarchar(255)= '' ,@DefImpact nvarchar(255) = '',AS Begin declare @sql nvarchar(4000)declare @whereClause nvarchar(4000)DECLARE @return_value intdeclare @sqlWhere nvarchar(4000) select @sql = 'SELECT DefApp, DefBusFunction, DefImpact FROM Def LEFT JOIN ZFunction ON (def.DefApp = ZFunction.App) AND (Def.DefBusFunction = ZFunction.BusFunction)' if @DefImpact <> '' Set @whereClause = ' where DefImpact ' SET @whereClause = @whereClause + ' = ''' + @DefImpact + '''' set @sqlWhere=@sql + @WhereClauseEXEC @sqlWhereEnd
and i am calling this SP from my ASP.net application to fill the SSRS report. I have written code in ASP.NET like:
sqlCmd = new SqlCommand("subbusample", conn);
sqlCmd.CommandType = CommandType.StoredProcedure;sqlCmd.Parameters.Add(new SqlParameter("@DefImpact", SqlDbType.NVarChar, 255, txtValue3.Text.ToString()));
sqlCmd.Parameters.Add(new SqlParameter("@DefBusFunction", SqlDbType.NVarChar, 255, txtValue1.Text.ToString()));
sqlCmd.Parameters.Add(new SqlParameter("@DefApp", SqlDbType.NVarChar, 255, txtValue2.Text.ToString()));
RptViewer.ProcessingMode = Microsoft.Reporting.WebForms.ProcessingMode.Remote;
RptViewer.ServerReport.ReportServerUrl = new System.Uri("http://servername/ReportServer");RptViewer.ShowParameterPrompts = false;
RptViewer.ServerReport.ReportPath = "/folder name/Subbu_Sample";
when i execute it, i am not able to fill the report with data.
Please let me know what i am doing wrong.
Thanks,
SR.
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Aug 18, 2004
I'm new to using DTS packages and I'm running into a problem. Hopefully someone can help me out. I have an ASP.NET page that needs to call a DTS package. Everything seems to be working right up until I call opkg.Execute. The package seems to run but nothing happens. After further investigation I have found what looks like a permissions issue. this is the message I'm getting"
Error Number:
-2147467259 {Integer}
Error Description:
"The Microsoft Jet database engine cannot open the file ''. It is already opened exclusively by another user, or you need permission to view its data." {String}
This is obviously a permissions issue. I'm just not sure who the DTS package is running as and where to set the permissions.
Any ideas????
Thanks
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Aug 31, 2001
How to do this?thanks :-)
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Sep 15, 2000
Does anyone know the command that can be used to call a dts package directly from VB?
regards,
reshma
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Jun 3, 2000
Hello,
What is the syntax of calling stored procedure from vb
Is there any1 can please give me a example of how to call sp with passing parameters, thanks a lot.
Thanks
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May 27, 2004
I have a DTS package created in a databasse and need to call that DTS package from a stored procedure.Is there a way that I can do it?
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Mar 10, 2006
If you have a begin tran in a sp that calls another sp and that called sp fails. can you execute a roll back from the called sp, or should it return and error which will roll back the begin tran in the original sp
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Mar 22, 2002
Hi all,
I want to call dts package from visual basic. The dts package will do a backup of the database.
I am not sure how this can be achieved.
Any help will be great
Thanks
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May 19, 2002
SQL Server Load Balancing -- Any ideas?
There is no inherent mechanism available in SQL Server (replication, log shipping, or clustering) which allows you to load balance you database server.
Clustering is only useful for a failover situation and does not allow active/active balancing.
Is is possible to use merge replication between two identical OLTP servers
and manage transactions via MSMQ? Will this mechanism allow for a load balanced OLTP server?
Will this work? If not, why not?
What will work? Will federated servers work for an entire database??
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Oct 5, 1998
I need a simple example of calling a dll or exe with params
from a stored procedure.
Thanks
Robert Kapciuk
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