Using The Same Connection In Multiple Threads -&&> Native Exception

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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Row Data Can`t Be Set _ Native Exception

Oct 27, 2007



Dear brothers, still have problem with .net compact framework 1.1 (2003) when i try to sync the data between sqlce and sql server 2000 " not from the first time some times from several times of using the syncronization"

is there any services pack for sql ce

what is appropriate cab file(.NET COMPACT FRAMEWORK, SQLCE etc is ARMI,ARM4....) version for windows mobile 5 with intermec CN3 Device

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Merge Replication - Native Exception

Jan 11, 2006

Hi!

Here are the details:

- Merge replication is set up between SQL Server 2000 SP3 <-> SQL CE clients

- It is expected for the system to have 100-150 PDA users

- About 80-90 tables are being replicated. About half of the tables are for documents  that PDA users create. These tables have to be filtered by SUSER_SNAME() to minimize data transfered and not to allow users to see each others documents. For filtering we used join filters (now there is about 30-40 join filters)

- Tables shared by users have GUID primary key, while other tables have identity columns.

System seemed to work fine when number of tables and number of join filters was about half that it is now.

Now, occasionally we get Native exception 0x00000005 on the PDA after calling Synchronize method of the C# Replication object. Data is transfered to the server, but the application hangs.

In the documentation for SQL Server it is mentioned that performance may suffer from too many join filters so this may be the cause of our problem.

If this is source of the problem one solution would be to use simple horizontal filtering on all tables now included in the join filters (and to add username field to all these tables). We could also reduce number of join filters with denormalisation (which we are not inclined to do).

Any other suggestions? Is our assumption about the source of the error corect?

Can anyone give us some recommendations for database metrics (number of constraints, tables, join filters etc) that can (or do) work with sql ce merge replication.

Thanks!

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Native Exception 0xc0000005 When Using SQLCE 3.0/3.1 And .NET CF 2.0?!

Oct 3, 2007

Greetings,



I have written a very basic C# console test app to check the performance and reliability of SQLCE on Windows CE 5.0 (source code below). Running this on different Windows CE 5.0 devices, I always get a 0xc0000005 native exception error when reaching 25592 inserts. It doesn't matter whether the database is empty or not when the test is run, it always fails at that exact number of inserts. Given that I would expect a managed application not to be able to generate native exceptions anyway, and can't really see any reason why it would in this case, I'm at a bit of a loss as to what's going wrong... Any ideas?



Using:
VS2005 w/ SP1
Windows CE 5.0 (on custom SH4 platform and HTC WM5 smartphone)
.NET CF 2.0 w/ SP1 and post SP1 patch
SQLCE 3.0.3600.0





TIA

PS. The same code (with some SQLCE 3.0 specific bits removed - version and result set for checking table existence) works perfectly under .NET CF 1.0 and SQLCE 2.0).





Source code:





using System.Data;
using System.Data.SqlServerCe;





namespace TestDB
{
class Program
{
static void Main(string[] args)
{
SqlCeConnection sqlConnection = new SqlCeConnection();
SqlCeCommand sqlCommand = sqlConnection.CreateCommand();
SqlCeResultSet sqlResult;





string strDatabase = "\TestDB.sdf";
string strTable = "TestTable";





try
{
// Database connection string
sqlConnection.ConnectionString =
"Data Source=" + strDatabase;





// Database file doesn't exist?
if (!System.IO.File.Exists( strDatabase ))
{


Console.WriteLine("Creating database: " + strDatabase);





// Create SQL engine object
SqlCeEngine sqlEngine = new SqlCeEngine(
sqlConnection.ConnectionString);



// Use it to create database


sqlEngine.CreateDatabase();
}





Console.WriteLine("Opening database: " + strDatabase);





// Open database connection
sqlConnection.Open();





// Display SQL version
Console.WriteLine("SQL Version: "
+ sqlConnection.ServerVersion.ToString());





// Check if table exists
sqlCommand.CommandText = "SELECT TABLE_NAME FROM "
+ "INFORMATION_SCHEMA.TABLES WHERE "
+ "TABLE_NAME = '" + strTable + "'";
sqlResult = sqlCommand.ExecuteResultSet(
ResultSetOptions.Insensitive);





// Table doesn't exist?
if (!sqlResult.Read())
{
Console.WriteLine("Creating table: " + strTable);





// Create table
sqlCommand.CommandText = "CREATE TABLE " + strTable
+ "(Sequence integer IDENTITY(1,1) NOT NULL PRIMARY KEY, "
+ "Timestamp datetime DEFAULT GETDATE(),"
+ "Message nvarchar(80))";
sqlCommand.ExecuteNonQuery();
}





string strText;


for (int i = 1; i <= 500000; i++)
{
Console.Write("
Inserted " + i.ToString() + " records ");





strText = "Row Number: " + i.ToString();


sqlCommand.CommandText = "INSERT INTO " + strTable
+ " (Message) VALUES ('" + strText + "')";
sqlCommand.ExecuteNonQuery();
}
}
// SQL error
catch(SqlCeException sqlex)
{
// Display all error messages
Console.WriteLine( "ERROR:" );
foreach (SqlCeError sqlError in sqlex.Errors)
{
Console.WriteLine( sqlError );
}
}
// Other errors
catch(Exception ex)
{
// Display error message
Console.WriteLine( "ERROR:" );
Console.WriteLine( ex.Message );
}
finally
{
// Close connection
if (sqlConnection.State != ConnectionState.Closed)
{
Console.WriteLine("Closing database");


sqlConnection.Close();
}
}


Console.ReadLine();
}
}
}

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Nov 30, 2007

Hi,
I have developed a Smart Device Application using VB.NET 2003 on top of Windows Mobile 2003 platform which is running on Symbol PPT 8846, a model used in our construction sites for gathering data bar-coded on Pipes, trucks...etc. This application uses SQL CE as its back-end database and since its difficult to cover our sites with WI-FI coverage, most of the time the application is running offline. As for that, on a daily basis, synchronization is done in the offices before the system is released into sites. I have been doing several implementations in several projects and till now everything is running fine but until I got a native exception on exporting the data back into the server database. The server database or main database is using Fox Pro and this is what led me to build a Web Service for communication between SQL CE and Fox Pro. Anyways, going back to that mysterious exception, I did some of my intensive debug on what caused it. As a start, I went through the code line by line to check if there was a memory leak from P/Invokes; but I was shocked that the exception was raised from "SQLCEDataAdapter.Fill(Dataset)" function. First thought came to mind was to hard reset and to re-install the application but no luck. Since it was about SQLCE, I moved towards checking the data found in the SQLCE database and tried to de-fragment the data found under the table needed for export. What I mean by de-fragmenting is that I grouped the data under different classes or families and created different tables depending on these classes. Then tried exporting again and Bingo the data was exported except one record...That was so weird!! huh? (The database had 515 records)
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But after this resolution, I really don't know how it could be controlled later on!! and why it happened??
I would be glad if anyone can give me any advise on why such problem popped out and especially on the column-level in SQL CE?? And how to overcome it?

Thanks for your time and effort,

Looking forward to hear from as soon as possible...


Just for Clarification:
.NET CF 1.0 SP3

SQLCE 2.0
were used

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Hi All,

We have written a multithreaded application in which we are maintaining separate Database connections for each thread. these connections are opened and closed at the start and exit of the thread.

We have observed that even if there is only one thread running ( application thread), execution of simple Select queries some times throws Native exception(Error - 0xc0000005 ).

This error comes intermittently. Execution of same query doesn't throw exception.

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There are severeal queries thats affected, but here is one example:
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An Unspecified Error Had Occurred In The Native SQL Server Connection Component.

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Hello All,



I need you help badly. Iam a student and iam working on "Creating a Mobile Application with SQL Server Compact Edition" http://msdn2.microsoft.com/en-us/library/ms171908.aspx . This tutorial works fine until

Create the publication snapshot






In SQL Server Management Studio, in Object Explorer, expand the (local) computer node.


Expand the Local Publications folder, select the publication name, right-click SQLMobile, and then click View Snapshot Agent Status.


In the View Snapshot Agent Status dialog box, click Start.

Make sure that the snapshot job has succeeded before you continue.

When I try to create a snapshot iam getting the following error "An unspecified error had occurred in the native SQL Server connection component." . I have no clue what to do next please help me out.

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Hi,

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It's quite simple to reproduce...

1. open a database

2. open a rowset on table A (whatever, valid of course and with both IOpenRowset and ICommandText), read datas and close rowset

3. power off

4. power on

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6. being stuck ;-)



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Dear all,

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The SQLPutData call fails under the following conditions with sqlstate 08S01

- The database resides on SQL Server 2000
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- The table consists e.g. of one Identity column (key column) and nine image columns
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1: 6781262
2: 119454

3: 269
4: 7611

5: 120054

6: 269

7: 8172

8: 120054

9: 269
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All data blocks including no 7 are inserted. If the first chunk of data block 8 should be written with SQLPutData the function fails and the connection is broken. There are errors such as "broken pipe" or "I/O error" depending on the used network protocol.

If data no 7 consists of 8173 bytes instead of 8172 all works again.
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Hi



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Jan 16, 2008

Greetings everyone, I am attempting to build my first application using Microsofts Sql databases. It is a Windows Mobile application so I am using Sql Server Compact 3.5 with Visual Studio 2008 Beta 2. When I try and insert a new row into one of my tables, the app throws the error message shown in the title of this topic.
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My table has 4 columns (i have since changed my FavoriteAccount datatype from bit to Integer)
http://i85.photobucket.com/albums/k71/Scionwest/table.jpg

Account type will either be "Checking" or "Savings" when a new row is added, the user will select what they want from a combo box.

Next is a snap shot of my startup form.
http://i85.photobucket.com/albums/k71/Scionwest/form.jpg



Where it says "Favorite Account: None" in the top panel, I am using a link label. When a user clicks "None" it will go to a account creation wizard, and set the first account as it's primary/favorite. As more accounts are added the user can select which will be his/her primary/favorite. For now I am just creating a sample account when the label is clicked in an attempt to get something working. Below is the code used.


private void lnkFavoriteAccount_Click(object sender, EventArgs e)

{

FinancesDataSet.BankAccountRow account = this.financesDataSet.BankAccount.NewBankAccountRow();

account.Name = "MyBank Checking Account";

account.AccountType = "Checking";

account.Balance = Convert.ToDecimal("15.03");

account.FavoriteAccount = 1;//datatype is an integer, I have changed it since I took the screenshot.

financesDataSet.BankAccount.Rows.Add(account);
//The next three lines where added while I was trying to get this to work.
//I don't know if I really need them or not, I receive the error regardless if these are here or not.



this.bankAccountTableAdapter1.Update(financesDataSet);

this.financesDataSet.AcceptChanges();

refreshDatabase();

}


the refreshDatabase() code is here:


private void refreshDatabase()

{

this.bankAccountTableAdapter1.Fill(this.financesDataSet.BankAccount);

//Aquire a count of accounts the user has

int numAccounts = financesDataSet.BankAccount.Count;

//Loop through each account and see which one is the primary.

for (int num = 0; num != numAccounts; num++)

{
//Works ok in frmMain_Load, but when my lnkFavoriteAccount_click calls this, it throws the error.

if (this.financesDataSet.BankAccount[num].FavoriteAccount == 1)

{
//Display the primary account on our home page. User can click the link label & be taken to their account register.

this.lnkFavoriteAccount.Text = this.financesDataSet.BankAccount[num].Name.ToString();

this.lnkFavoriteFunds.Text = this.financesDataSet.BankAccount[num].Balance.ToString();

break;

}

}

}


and my form_load code

private void frmMain_Load(object sender, EventArgs e)

{

refreshDatabase();

}


So, when I click on the lnkFavoriteAccount label, and my new row gets added, the app stops at the following line in my DataSet.Designer

[global:ystem.Diagnostics.DebuggerNonUserCodeAttribute()]

public byte FavoriteAccount {

get {

try {

return ((byte)(this[this.tableBankAccount.FavoriteAccountColumn]));

}

catch (global:ystem.InvalidCastException e) {
//Stops at the following line, this error was caused by 'if (this.financesDataSet.BankAccount[num].FavoriteAccount == 1)'

throw new global:ystem.Data.StrongTypingException("The value for column 'FavoriteAccount' in table 'BankAccount' is DBNull.", e);

}

}

set {

this[this.tableBankAccount.FavoriteAccountColumn] = value;

}

}


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if (this.financesDataSet.BankAccount[num].FavoriteAccount == 1)

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When I look, the data has been added into the database, it's just when I try to retreive it now, it bails on me. Am I retreiving the information wrong?

Thanks for any help you guys can offer.

Johnathon

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Hi,

I got an strange problem with one of my packages.

When running the package in VisualStudio it runs properly, but if I let this package run as part of an SQL-Server Agent job, I got the message "The script threw an exception: Exception of type 'System.OutOfMemoryException' was thrown." on my log and the package ends up with an error.

Both times it is exactly the same package on the same server, so I don't know how the debug or even if there is anything I need to debug?

Regards,

Jan

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SQL NATIVE CLIENT - OLE DB Connection On 64 Bit Client

Apr 23, 2008

I have tried this on several different operating systems (VISTA and XP ) and several versions of SQL NATIVE CLIENT including 2005.90.3042.0

I have a 64 bit "SQL NATIVE CLIENT" connection that fails. The exact same connection and code succeeds on 32 bit.
My customer and I prepend "oledb:" to the connection string and it starts working.

FAILS on 64 bit:
Provider=SQLNCLI.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=Wrigley_Test;Data Source=MONGO;Use Procedure for Prepare=1;Auto Translate=True;Packet Size=4096;Workstation ID=RIPTIDE;Use Encryption for Data=False;Tag with column collation when possible=False;MARS Connection=False;DataTypeCompatibility=0;Trust Server Certificate=False

WORKS
oledb:Provider=SQLNCLI.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=Wrigley_Test;Data Source=MONGO;Use Procedure for Prepare=1;Auto Translate=True;Packet Size=4096;Workstation ID=RIPTIDE;Use Encryption for Data=False;Tag with column collation when possible=False;MARS Connection=False;DataTypeCompatibility=0;Trust Server Certificate=False

I debugged my code to the point that I know it is happening when I call CreateAccessor for my SQL statement.


m_hr=m_pIAccessor->CreateAccessor(DBACCESSOR_ROWDATA, GetCols(), (m_pDBBinds+IsBookmarked()), 0, &m_hAccessor, NULL);

Error:

Microsoft SQL Native Client: Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done.

Does anyone have any suggestions?

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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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