SQLBulkCopy In A C# App Causes SQL Server 2005 To Lock Up
May 16, 2007
I have written an app that will allow you to send a query to Teradata, return the results into a Reader and then Bulk Copy that data into SQL Server 2005.
If the query results in a large dataset (ie 20,000,000 rows) is processed then while that data is being bulk copied into SQL Server, using the SQLBulkCopy class, then it prevents users on other computers from logging into SQL Server Management Studio.
Those that are already logged in are shut down also. Everything appears fine to the users but queries do not finish running.
Everything immediatly starts working as normal when either my program finishes or I shut down my program.
Is there any type of property to the SQLBulkCopy class or any other function that will prevent Management Studio from locking up?
Thanks
Robert
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Dec 10, 2006
Hello,
Wondering if anyone can help with a strange exception thrown while using the SqlBulkCopy class. I am using the class to transfer records from a DataTable in memory (approx 11,000 rows) into a SQL Server 2005 table.
Initially, the WriteToServer method was timing out a la KB913177 (http://support.microsoft.com/default.aspx/kb/913177), however I downloaded the hotfix, which eliminated this issue.
Now, I get a new exception thrown, as follows:
System.Data.SqlClient.SqlException: OLE DB provider 'STREAM' for linked server '(null)' returned invalid data for column '[!BulkInsert].Power_Avg'.
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.SqlBulkCopy.WriteToServerInternal()
at System.Data.SqlClient.SqlBulkCopy.WriteRowSourceToServer(Int32 columnCount)
at System.Data.SqlClient.SqlBulkCopy.WriteToServer(DataTable table, DataRowState rowState)
at System.Data.SqlClient.SqlBulkCopy.WriteToServer(DataTable table)
I can't see anything wrong with the data I have. The column "Power_Avg" is of type "float". When forming the DataTable, I cast my data to float expcilitly in C#.
Other things to know:
I am using SQL Server Express (2005)
This same code works fine with SQL Server 2000 (MSDE)
My code makes all modifications inside a single transaction of type "Snapshot" (I have activated SNAPSHOT READ COMMITTED in the database)
I have not activated MARS in the connection
Any ideas / suggestions?
Thanks,
Nick
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Feb 12, 2008
Hi there,
I just wrote an article on how to Lock Down SQL Server 2005 that might interest people here. It has step-by-step instructions and SQL scripts for server and database hardening. A lot of concepts are explained along the way.
As an experiment I also have a world-accessible SQL2005 shell to let people experiment with a hardened database and see if they can do privilege escalation. A lot of the standard tricks have been tried so far and the server has held up without any problems. I wonder if that will last
Anyhow, the article is here: http://duartes.org/gustavo/articles/Lock-Down-SQL-Server-2005.aspx. I appreciate all feedback.
cheers,
Gustavo
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Mar 22, 2007
We have an old VB6 app using a SLQ Server 2005 database.
This database is also used by a web service.
When accessed just by the VB6 or WebService everything runs smoothly.
The problem occur`s when both access the database in parallel.
Our web service seem`s to encounter some very long delay for queries running just fine when is alone.
Now my knowledge of VB6 is very limited (and it will stay that way :) i`ve checked the code for access part and some parts look obscur.
so here is the part where the queries gets executed
Set m_adoRecordSet = New ADODB.Recordset
With m_adoRecordSet
.CursorLocation = iCursorLocation
.CursorType = iCursorType
.LockType = iLockType
Set .ActiveConnection = objConnection
.Open m_strSQL
End With
i looked everywhere in the code and iCursorLocation is mainly always SQLClient. i think only one time is SQLServer.
iCursorType is always SQLForwardOnly and iLockType is always SQLReadOnly.
now the curious part (for me) is that the connection (objConnection) is opened at the beginning of the app and never closed? Is that normal in VB6?
Would the cursor being sometimes on the server be the problem?
If someone could help it would be very appreciated.
If you need more details just tell me.
thanks
mateo
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Mar 28, 2006
When one process has one record locked in Update-Mode then an other process can't update any other records on that table with some queries, other queries that access the same records (but with a different WHERE statement) will execute.
This problem occurs with SQL Server 2005, but it didn't with SQL Server 2000 (or any other database).
The problem:
-Process 1 locks a record in the table, and keeps it in Update-Mode, because the user is editing it. (Using OLEDB Pessimistic Cursor-locking)
-Process 2 wants to update an other record, buts gets a "Lock timeout" when using one query but not with another.
For example this query will work :
UPDATE gwseqnumber SET nextseqnr = 3 WHERE row_id = 110;
But this qeury will give me a "Lock timeout" :
UPDATE gwseqnumber SET nextseqnr = 3 WHERE name = 'REC_2';
But it is the same record!!
The record with name = 'REC_2' has the row_id = 110, both values are unique in the table.
The data:
The table [gwseqnumber] has the following CREATE statement:
CREATE TABLE GWSEQNUMBER
(
NEXTSEQNR INTEGER,
NAME CHAR (20),
ADMINISTRATIONCODE INTEGER,
FINDHIGHESTNUMBER CHAR (1),
CLOSEDYN CHAR (1),
ROW_ID INT IDENTITY(1,1) NOT NULL
);
CREATE INDEX KEY_1 ON GWSEQNUMBER (NEXTSEQNR);
CREATE UNIQUE KEY_2 ON GWSEQNUMBER (ADMINISTRATIONCODE, NAME, IDENTIFIER);
CREATE UNIQUE INDEX KEY_3 ON GWSEQNUMBER (ROW_ID);
Both KEY_2 and KEY_3 are unique, KEY_1 is not.
If I remove the index on the NEXTSEQNR column (the index named KEY_1) then both these queries will work, so it is obviously related to the index.
Altough the index is obsolete and can be removed from this table, it should not result in bogus locking errors.
Even when i removed the index not all the queries will work. (With work i mean not run into a locking error, while the record is not even locked.)
Solutions tried:
- Set the compaitiblity level of the databsae back to 80 (for SQL Server 2000 compatibility).
- I have already tried to disable Page-Locking on all the indexes of this table.
So why does the index lock my updates in SQL Server 2005?
And how do i fix it so my database does not run into these locks?
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May 30, 2006
When doing the service pack 1 install on a client side the machine is locking up on a specific file. The tech who tried it out doesn't remember the exact file name but he thinks it ended with an .msb or .msp
I checked in the C:Program FilesMicrosoft SQL Server90Setup BootstrapLOGFiles directory and none of the files have been updated.
Thoughts?
Shane
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Apr 20, 2006
I am running VS 2005 Professional Edition
Windows XP profession with Service Pack 2
SQL Server 2005 Developer Edition.
WHAT I HAVE DONE:
I have a database running in an instance of SQL Server.
I set this up for merge publication and then set up a SQL Server Mobile Edition Subscription to that publication. After a few oversights I got everything working. The Mobile database replicated just fine. I went back verified all data was there. Can make queries to it.
PROBLEM:
I set up a new dataset to use tables from the SQL Server Mobile database. If I drag one of the tables to the dataset, VS 2005 simply stops responding. It is not using any processor. I click any place on the application and I get the Microsoft Visual Studio Delay Notification saying:
Microsoft Visual Studio is Busy.
Microsoft Visual Studio is waiting for an internal operation to complete. If you regularly encounter this delay during normal usage, please report this problem to Microsoft.
Well... It is more than just a delay. The environment is not using any processor its just sitting here. And I left it running for 2.5 hours... so now this is becoming a big source of pain for me because I need to get that dataset working to finish my business logic. The only option I have is to Kill the process.
Hopefully someone out there can help.
Additional Services running:
IIS (Whatever version comes with Windows XP Pro. I think 5.1)
SQL Server Agent, SQL Server Integration Services, SQL Server Broswer and SQL Server FullTextSearch
UPDATE: I am editing this post with an update.
I noticed that my other tables get added to the dataset just fine. It is when I add one particular table that the entire visual studio simply stops and starts giving the delay notification. I have no idea why this happens... nor do I see any noticeable difference between this table and the rest of them. I went back and made sure that all columns types where directly supported by SQL Mobile Edition and they are.
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Dec 13, 2007
Hi, I'm a Student, and since a few months ago I'm learning JAVA. I'm creating an application to call and compare times. For this I create in Excel a time table which is quite big and it would be a lot of typing work to input one by one the data in each cell in SQL Server, considering that I have to create 8 more tables. I was able to retreive the data from excel usin the JXL API of JAVA but it doesn't give all the funtions to perform math operations as JDBC. That's why I need to move the tables from Excel to SQL.
I found this site http://davidhayden.com/blog/dave/archive/2006/05/31/2976.aspx which gives a code to do so, but I guess that some heathers are missing or maybe I don't know which compiler to use to run that code, I would like you help to identify which compiler use to run that code or if there is some vital piece of code missing.// Connection String to Excel Workbook
string excelConnectionString = @"Provider=Microsoft .Jet.OLEDB.4.0;Data Source=Book1.xls;Extended Properties=""Excel 8.0;HDR=YES;""";
// Create Connection to Excel Workbook
using (OleDbConnection connection = new OleDbConnection(excelConnectionString))
{
OleDbCommand command = new OleDbCommand ("Select ID,Data FROM [Data$]", connection);
connection.Open();
// Create DbDataReader to Data Worksheet
using (DbDataReader dr = command.ExecuteReader())
{
// SQL Server Connection String
string sqlConnectionString = "Data Source=.; Initial Catalog=Test;Integrated Security=True";
// Bulk Copy to SQL Server
using (SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnectionString))
{
bulkCopy.DestinationTableName = "ExcelData";
bulkCopy.WriteToServer(dr);
}
}
}
On the other hand in this forum I that someelse use that link but implements a totally different code which I'm not able to compile also http://forums.asp.net/p/1110412/2057095.aspx#2057095. It seems this code works as I was able to read, but I do not know which language is used.
Dim excelConnectionString As String = "Provider=Microsoft .Jet.OLEDB.4.0;Data Source=Book1.xls;Extended Properties=""Excel 8.0;HDR=YES;"""
' Using
Dim connection As OleDbConnection = New OleDbConnection(excelConnectionString)
Try
Dim command As OleDbCommand = New OleDbCommand("Select ID,Data FROM [Data$]", connection)
connection.Open()
' Using
Dim dr As DbDataReader = command.ExecuteReader
Try
Dim sqlConnectionString As String = WebConfigurationManager.ConnectionStrings("CampaignEnterpriseConnectionString").ConnectionString
' Using
Dim bulkCopy As SqlBulkCopy = New SqlBulkCopy(sqlConnectionString)
Try
bulkCopy.DestinationTableName =
"ExcelData"
bulkCopy.WriteToServer(dr)
Finally
CType(bulkCopy, IDisposable).Dispose()
End Try
Finally
CType(dr, IDisposable).Dispose()
End Try
Finally
CType(connection, IDisposable).Dispose()
End Try
Catch ex As Exception
End Try
The Compilers I have are: Eclipse, Netbeans, MS Visual C++ Express Edition and MS Visual C# Express Edition. In MS Visual C++
Thanks for your help.
Regads,
Robert.
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Feb 2, 2007
I simply made my script task (or any other task) fail
In my package error handler i have a Exec SQL task - for Stored Proc
SP statement is set in following expression (works fine in design time):
"EXEC [dbo].[us_sp_Insert_STG_FEED_EVENT_LOG] @FEED_ID= " + (DT_WSTR,10) @[User::FEED_ID] + ", @FEED_EVENT_LOG_TYPE_ID = 3, @STARTED_ON = '"+(DT_WSTR,30)@[System::StartTime] +"', @ENDED_ON = NULL, @message = 'Package failed. ErrorCode: "+(DT_WSTR,10)@[System::ErrorCode]+" ErrorMsg: "+@[System::ErrorDescription]+"', @FILES_PROCESSED = '" + @[User::t_ProcessedFiles] + "', @PKG_EXECUTION_ID = '" + @[System::ExecutionInstanceGUID] + "'"
From progress:
Error: The Script returned a failure result.
Task SCR REIL Data failed
OnError - Task SQL Insert Error Msg
Error: A deadlock was detected while trying to lock variable "System::ErrorCode, System::ErrorDescription, System::ExecutionInstanceGUID, System::StartTime, User::FEED_ID, User::t_ProcessedFiles" for read access. A lock could not be acquired after 16 attempts and timed out.
Error: The expression ""EXEC [dbo].[us_sp_Insert_STG_FEED_EVENT_LOG] @FEED_ID= " + (DT_WSTR,10) @[User::FEED_ID] + ", @FEED_EVENT_LOG_TYPE_ID = 3, @STARTED_ON = '"+(DT_WSTR,30)@[System::StartTime] +"', @ENDED_ON = NULL, @message = 'Package failed. ErrorCode: "+(DT_WSTR,10)@[System::ErrorCode]+" ErrorMsg: "+@[System::ErrorDescription]+"', @FILES_PROCESSED = '" + @[User::t_ProcessedFiles] + "', @PKG_EXECUTION_ID = '" + @[System::ExecutionInstanceGUID] + "'"" on property "SqlStatementSource" cannot be evaluated. Modify the expression to be valid.
Warning: The Execution method succeeded, but the number of errors raised (4) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors.
And how did I get 4 errors? - I only set my script task result to failure
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Apr 7, 2004
Hi
We are facing an acute situation in our web-application. Technology is ASP.NEt/VB.NET, SQL Server 2000.
Consider a scenario in which User 1 is clicking on a button which calls a SQL stored procedure. This procedure selects Group A of records of Database Page1.
At the same time if User 2 also clicks the same button which calls same SQL stored procedure. This procedure selects Group B of records of Database Page1.
So, its the same Page1 but different sets of records. At this moment, both the calls have shared locked on the Page1 inside the procedure.
Now, in call 1, inside the procedure after selecting Group A of records, the next statement is and update to those records. As soon as update statement executes, SQL Server throws a deadlock exception as follows :
Transaction (Process ID 78) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction
We are able to understand why its happening. Its because, Group A and Group B of records are on the same Page1. But both the users have shared lock on the Page1. So, no one gets the exclusive lock in records for update, even though, the records are different.
How can I resolve this issue? How can I get lock on wanted rows instead of entire page?
Please advice. Thanks a bunch.
Pankaj
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Nov 9, 2007
Hey Folks -
I'm setting up a new production SQL 2005 64-bit server running on a dedicated Windows 2003 R2 Standard system w/8GB of RAM.
I've enabled the "Lock Pages in Memory" option (http://msdn2.microsoft.com/en-us/library/ms190730.aspx) but when I run dbcc memorystatus all of my AWE counters show 0.
According to http://blogs.msdn.com/sqlprogrammability/:
"On 64 bit machines, execute 'dbcc memorystatus'. If the AWE Allocated memory is 0 then lock pages in memory privilege has not been granted to the service account or it has not taken effect. "
Does the "Lock Pages in Memory" option work on W2K3 R2 Standard? Just searching across the web I find different answers. In some places it clearly says that Lock Pages in Memory only works on W2K3 Enterprise systems. In other places it says that it should work on any Windows 2003 64-bit OS.
Does anyone have any ideas? Assuming we cannot "lock pages in memory" due to the Windows 2003 Standard OS, are there any other memory management recommendations out there?
thanks!
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May 22, 2006
Hi,
I have set of 2 DTS packages, one of which calls the other by forming a command-line (dtexec) using a Execute Process task.
From the parent package-> Execute Process Task->
dtsexec /F etc... /<pkg variable> = "servername"
Each of the parent and the called package have a variable: "User::DWServerSQLInstance" which is mapped to the SQL server connection manager server name property using an expression. The outer package has the above variable and so does the inner called package (which gets assigned through the command line from the outerpackage call to inner)
I "sometimes" get the following error:
OnError,I4,TESTDOMAdministrator,ACDWAggregation,{A1F8E43F-15F1-4685-8C18-6866AB31E62B},{77B2F3C7-6756-46EB-8C01-D880598FB4B3},5/22/2006 5:10:28 PM,5/22/2006 5:10:28 PM,-1073659822,0x,The variable "User::DWServerSQLInstance" is already on the read list. A variable may only be added once to either the read lock list or the write lock list.
Help would be appreciated!
I have seen other posts on this but, not able to relate the solution to my scenario.
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May 10, 2006
Hi All,
I have seen a few other people have this error.
Package works fine when run from BIDS, DTExec, dtexecui. When I schedule it, It get these random errors. (See below)
The main culprit is a variable called "RecordsetFileDIR" which is set using an expression. (@[User::_ROOT] + "RecordSets\")
A number of other variables use this as part of their expression and as they all fail, pretty much everything dies.
I have installed SP1 (Not Beta) on server. Package uses config files to set the value of _ROOT.
The error does not always seem to be with this particular variable though. Always a variable that uses an expression but errors are random. Also, It will run 3 out of 10 times without a problem. I am the only person on the server at the time.
Any ideas?
Cheers,
Crispin
Error log:
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073659822,0x,The variable "User::RecordsetFileDIR" is already on the read list. A variable may only be added once to either the read lock list or the write lock list.
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073639420,0x,The expression for variable "rsHeaderFile" failed evaluation. There was an error in the expression.
OnError,,,DF_Header_Header,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,Move All Data,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,Load Open Batches and Process Files,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,DF_Header_Header,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,Move All Data,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,Load Open Batches and Process Files,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,DF_Header_Header,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
OnError,,,Move All Data,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
OnError,,,Load Open Batches and Process Files,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
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May 23, 2007
I am using SQLBULKCOPY to copy Excel spreadsheet into SQL Express Database table. The copying went okay, but the only problem I have is that few records in one of the columns is NULL.
The column contains numeric and alphnumeric fields in the spreadsheet. After copying, the numeric fields got copy with no complication, but all the alphanumeric fields all becam NULL. Can someone help me with this problem?
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Jun 9, 2008
HI,
I have one doubt. Is it possible to transfer data from one SQL Server to other SQL Server over the LAN.( Both the SQL Server database are in different cities)
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May 19, 2005
Hello,
I was curious if anyone knew if using SqlBulkCopy in code required any special permissions on the database side. I wasn't sure if more permissions than writing capabilities were needed.
Thanks.
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Feb 4, 2007
I need to copy large amounts of data between SQL databases, and between SQL and Access. I've been reading a lot of good explanations of SQLBulkCopy, but the only good examples I've found are written in C# and I work in VB. I'm very new to ASP.NET 2.0 (about a month) and came from Classic ASP, not .NET 1.1. I'm still getting my feet wet and I'm afraid it doesn't take much to confuse me. Can someone point me to a good article or tutorial that includes a clear example written in VB?
Diane
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Nov 28, 2007
Hi,
I am trying to use sqlbulkcopy to insert the contents of a data table to a temporary table in the database. The content of data table comes from a csv file. I can add the rows to the data table but it seems they are added as strings and when I try to WriteToServer(datatable) it chokes becuase my table has some int fields. Not sure how to do this.private static TimeSpan DoBulkCopy(string filePath)
{Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
StreamReader sr = new StreamReader(filePath);
prepareTable();string fullFileStr = sr.ReadToEnd();
sr.Close();
sr.Dispose(); string[] lines = fullFileStr.Split('');
DataTable dt=new DataTable() ;string[] sArr =lines[0].Split(',');foreach(string s in sArr)
{dt.Columns.Add(new DataColumn());
}
DataRow row;string finalLine = "";foreach (string line in lines)
{
row = dt.NewRow();finalLine = line.Replace(Convert.ToString('
'), "");row.ItemArray = finalLine.Split(',');
dt.Rows.Add(row);
} SqlConnection cn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["connectionString"].ToString());System.Data.SqlClient.SqlBulkCopy bc = new System.Data.SqlClient.SqlBulkCopy(cn, SqlBulkCopyOptions.TableLock, null);
bc.BatchSize = dt.Rows.Count;
cn.Open();bc.DestinationTableName = "tmpTable";
bc.WriteToServer(dt); // <--------------- it dies here
cn.Close();
bc.Close(); TimeSpan ts = stopWatch.Elapsed;
stopWatch.Stop();return ts;
}private static void prepareTable()
{SqlConnection cn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["connectionString"].ToString());
string sql = @"if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[tmpTable]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)drop table [dbo].[tmpTable]; CREATE TABLE [dbo].[tmpTable] ([Remote] [int],[KFP] [int]) ON [PRIMARY]";SqlCommand cmd = new SqlCommand(sql, cn);
cn.Open();
cmd.ExecuteNonQuery();
cn.Close();
cmd.Dispose();
}
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Feb 29, 2008
Hello.
I have a problem using SqlBulkCopy for updating tables. In fact, I can´t update any table. I use this function for insert big groups of records, but I would like to know how I can configure SqlBulkCopy for update rows. I would like to see if there is a record (primary key exists) then update it.
Is possible?
Greetings.
Tanen.
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Apr 25, 2008
Does SqlBulkCopy have any adverse affects on it's target table indexes? I like the performance gain but am worried about creating unnecessary table scans if the indexes/stats are not updated properly after it completes...
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Sep 6, 2006
I'm using SqlBulkCopy. Does anyone know how I can output what row (its column names) are throwing a duplicate primary key message when I bulkCopy.WriteToServer(datatable1)?Thanks
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Apr 17, 2007
I have a collection of around 16000 records, and have been trying to find the best way to update the information in the DB. I have done alot of reading about both BulkCopy and Batch Update, but haven't come to any clear solutions as to which performs better. I am not doing any inserting, just getting a dataset from the DB, changing the values, them want to update the Db again. Thanks for any help. Mick
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Apr 27, 2007
I'm in the final throws of redesigning a web application, and one of the major improvements is adding in an admin page for the users so they can maintain the data and system structure without the need for us to get involved.
One of the areas I'd held back on was promotion of data from SQL server to SQL server - once .NET 2 framework came in and we moved over to VS2005, I'm now in a position to do this work.
I have tested it and it works perfectly well for small tables, but as soon as I try it on a reasonably large table (860,000 rows) I get the following error in VS's output window:
"A first chance exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll
An exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll but was not handled in user code
Additional information: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding."
The application data is stored on SQL2005 servers, and I am running the application locally. I have tried running the copy from table to table on the same server (different databases) and i get the same result, which leads me to believe that it may be memory related. Running the SQL in SQL Server Management Studio works in just 15 to 20 seconds, but using VS falls over in just under a minute. My connection string has a timeout of 3600.
Here's my C# code:// Execute reader...
using (IDataReader vReader = vCmd.ExecuteReader())
{
// Create SqlBulkCopy...
SqlBulkCopy vBulkData = new SqlBulkCopy(aTargetConn);
// Set destination table name...
vBulkData.DestinationTableName = aTableName;
// Write data...
vBulkData.WriteToServer(vReader);
}
aSourceConn and aTargetConn are the appropriate SqlConnections, and aTableName is the table to be populated with data (previously backed up and emtied of contents).
Any help/advice suggestions gratefully received - if any more info needed please ask.
Thanks
Martin
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May 2, 2007
I am trying to import a CSV file into an SQL Server table with the OleDbDataReader and SqlBulkCopy objects, like this: using (OleDbConnection dconn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\mystuff\;Extended Properties="text;HDR=No;FMT=Delimited""))
{
using (OleDbCommand dcmd = new OleDbCommand("select * from mytable.csv", dconn))
{
try
{
dconn.Open();
using (OleDbDataReader dreader = dcmd.ExecuteReader())
{
try
{
using (SqlConnection dconn2 = new SqlConnection(@"data source=MyDBServer;initial catalog=MyDB;user id=mydbid;password=mydbpwd"))
{
using (SqlBulkCopy bc = new SqlBulkCopy(dconn2))
{
try
{
dconn2.Open();
bc.DestinationTableName = "dbo.mytable";
bc.WriteToServer(dreader);
}
finally
{
dconn2.Close();
}
}
}
}
finally
{
dreader.Close();
}
}
}
finally
{
dconn.Close();
}
}
}
A couple of the columns for the destination table use a bit datatype. The CSV files uses the strings "1" and "0" to represent these.When I run this code, it throws this exception:Unhandled Exception: System.InvalidOperationException: The given value of type String from the data source cannot be converted to type bit of the specified target column. ---> System.FormatException: Failed to convert parameter value from a String to a Boolean. ---> System.FormatException: String was not recognized asa valid Boolean. at System.Boolean.Parse(String value) at System.String.System.IConvertible.ToBoolean(IFormatProvider provider) at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) at System.Data.SqlClient.SqlParameter.CoerceValue(Object value, MetaType destinationType) --- End of inner exception stack trace --- at System.Data.SqlClient.SqlParameter.CoerceValue(Object value, MetaType destinationType) at System.Data.SqlClient.SqlBulkCopy.ConvertValue(Object value, _SqlMetaDatametadata) --- End of inner exception stack trace --- at System.Data.SqlClient.SqlBulkCopy.ConvertValue(Object value, _SqlMetaDatametadata) at System.Data.SqlClient.SqlBulkCopy.WriteToServerInternal() at System.Data.SqlClient.SqlBulkCopy.WriteRowSourceToServer(Int32 columnCount) at System.Data.SqlClient.SqlBulkCopy.WriteToServer(IDataReader reader) at MyClass.Main()It appears not to accept "1" and "0" as valid strings to convert to booleans. The System.Convert.ToBoolean method appears to work the same way. Is there any way to change this behavior? I discovered if you change the "1" to "true" and "0" to "false" in the CSV file it will accept them.
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Jun 15, 2007
I am trying to use SQLBulkCopy to copy from an excel spreadsheet to a table in a SQL database and it is all working fine, but I have to now change the connection to the SQl database to an ODBC connection and it is now erroring.
This is the error I get - keyword not supported 'dsn'
Is it possible to use SQlBulkCopy when using an odbc connection to the SQL database?
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Feb 7, 2008
I have a scenario whereby I'd like to insert multiple rows into a table on a SQL server database as efficiently and easily as possible.
After some research, it looked like .NET 3.0's SqlBulkCopy class would do what I want. I've tried to set something up, but it's not working. It's not even throwing an error. The code executes but it simply hasn't done the insert by the end of it!
My table structure is simple. The name of the table is LPSTUnavailableDate. It has just two columns, one of them an auto-populated ID field:
LPSTUnavailableDateId, INT, PRIMARY KEY, IDENTITY(1,1)
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Jun 5, 2008
I have encountered a very frustrating situation when trying to use SQLBulkCopy. I have two excel files that I am trying to import into two tables in an MSSQL Server 2005 Express DB. One excel file has 5,000 rows, while the other file has 500,000 rows.I was able to import the smaller file successfully using this vb.net code: Protected Sub L26ExcelToSQL() 'Declare Variables
Dim sSQLTable As String = "Local26Members"
Dim sExcelFileName As String = "Full Local 26 List Formatted.xls"
Dim sWorkbook As String = "[Sheet1$]"
'Create connection strings
Dim sExcelConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & _ "Data Source=D:hostingmemberwolsite1l26voterreg" & sExcelFileName & ";" & _ "Extended Properties=""Excel 8.0;HDR=YES"""
Dim sSqlConnectionString As String = ConfigurationManager.ConnectionStrings("SiteSqlServer").ConnectionString.ToString 'Execute a query to erase any previous data from our destination table
Dim sClearSQL = "DELETE FROM " & sSQLTable Dim SqlConn As SqlConnection = New SqlConnection(sSqlConnectionString) Dim SqlCmd As SqlCommand = New SqlCommand(sClearSQL, SqlConn) SqlConn.Open() SqlCmd.ExecuteNonQuery() SqlConn.Close() 'Series of commands to bulk copy data from the excel file into our SQL table
Dim OleDbConn As OleDbConnection = New OleDbConnection(sExcelConnectionString) Dim OleDbCmd As OleDbCommand = New OleDbCommand(("SELECT * FROM " & sWorkbook), OleDbConn) OleDbConn.Open() Dim dr As OleDbDataReader = OleDbCmd.ExecuteReader() Dim bulkCopy As SqlBulkCopy = New SqlBulkCopy(sSqlConnectionString) bulkCopy.DestinationTableName = sSQLTable bulkCopy.WriteToServer(dr) OleDbConn.Close() End Sub
However, when I tried to import the 500,000 row excel file, I got the following error: Server Error in '/L26' Application.
A
transport-level error has occurred when receiving results from the
server. (provider: TCP Provider, error: 0 - The specified network name
is no longer available.)
Description: An
unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the
error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException:
A transport-level error has occurred when receiving results from the
server. (provider: TCP Provider, error: 0 - The specified network name
is no longer available.)
Source Error:
Line 438:Line 439: bulkCopy.DestinationTableName = sSQLTableLine 440: bulkCopy.WriteToServer(dr)Line 441:Line 442: OleDbConn.Close()
Source File: d:hostingmemberwolsite1L26DuesDefault2.aspx.vb Line: 440
Stack Trace:
[SqlException (0x80131904): A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)] System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +925466 System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +800118 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +186 System.Data.SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject stateObj, UInt32 error) +556 System.Data.SqlClient.TdsParserStateObject.ReadSni(DbAsyncResult asyncResult, TdsParserStateObject stateObj) +164 System.Data.SqlClient.TdsParserStateObject.ReadPacket(Int32 bytesExpected) +34 System.Data.SqlClient.TdsParserStateObject.ReadBuffer() +44 System.Data.SqlClient.TdsParserStateObject.ReadByte() +17 System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +79 System.Data.SqlClient.SqlBulkCopy.WriteToServerInternal() +1336 System.Data.SqlClient.SqlBulkCopy.WriteRowSourceToServer(Int32 columnCount) +916 System.Data.SqlClient.SqlBulkCopy.WriteToServer(IDataReader reader) +151 _Default.CSVToSQL() in d:hostingmemberwolsite1L26DuesDefault2.aspx.vb:440 _Default.ButtonTest3_Click(Object sender, EventArgs e) in d:hostingmemberwolsite1L26DuesDefault2.aspx.vb:905 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105 System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1746
Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433 After I received this error message, I tried viewing my database through the MSSQL Control Panel utilized by my hosting provider (WebHost4Life). However, I was unable to connect to the database and received this error: ___________________Microsoft OLE DB Provider for SQL Server error '80040e14' Database 1496 cannot be autostarted during server shutdown or startup. /getDBinfo.asp, line 29
_____________________ Now here is the most frustrating/mysterious part. I figured that maybe the error message were a result of the large size of the second excel file, so just for testing purposes, I created a new table in my MSSQL database. The table just has two fields, both set to varchar(50). I then created a test excel file, that had one row with the word "test" in the first and second column. When I tried using the code above to import the test excel data into the test table, I got the same exact error as I did with the 500,000 row file!Please help, I'm really stumped and I am not sure when I am having so much trouble replicating the success I had the 5,000 row file. Any suggestions are much apprecaited. -Bryan
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Oct 6, 2006
I have created an assembly which I load into SQL 2005. However, if I set my connection string = context connection = true... I will get an error saying something like this feature could not be used in this context... So I changed my function to insert each row.... Now the issue I have is the transfer takes 4X as long.... Before I made the change I was using the bulkcopy by specifying the actual connection string....but I also had to specify the password in the string...and since I wanted to get way from this specification...I attempted the context route. So...is there any other way of using the bulkcopy feature or something like it using the context connection?
Private Shared Function BulkDataTransfer2(ByVal _tblName As String, ByRef _dt As DataTable, ByRef emailLog As String) As Boolean
Dim success As Boolean = False
emailLog = emailLog & System.DateTime.Now.ToString & " - bulk transfer2 - " & _tblName & vbCrLf
Dim insertStr As String = "INSERT INTO " & _tblName & "("
Dim values As String = ") Values("
Dim drow As DataRow = Nothing
Dim dCol As DataColumn = Nothing
'add the column names
For Each dCol In _dt.Columns
insertStr = insertStr & dCol.ColumnName.ToString & ", "
values = values & "@" & dCol.ColumnName.ToString & ", "
Next
'remove the last comma & form the final string
insertStr = insertStr.Substring(0, insertStr.Length - 2)
values = values.Substring(0, values.Length - 2)
insertStr = insertStr & values & ")"
Dim connStr As String = "context connection = true"
Dim conn As New SqlConnection(connStr)
Dim cmd As SqlCommand = Nothing
Using conn
Try
conn.Open()
For Each drow In _dt.Rows
cmd = New SqlCommand(insertStr, conn)
For Each dCol In _dt.Columns
cmd.Parameters.AddWithValue("@" & dCol.ColumnName.ToString, drow.Item(dCol.ColumnName.ToString))
Next
SqlContext.Pipe.ExecuteAndSend(cmd)
Next
success = True
Catch ex As Exception
emailLog = emailLog & System.DateTime.Now.ToString & " " & ex.ToString & vbCrLf
success = False
Finally
Try
conn.Close()
conn.Dispose()
Catch ex As Exception
success = False
End Try
End Try
End Using
Return success
End Function
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Apr 20, 2008
Hi,
Is there a JDBC equivalent of the SqlBulkCopy command?
Simply using batched INSERTs, it takes days to insert 1m rows into SQL Server. However using C# client that uses SqlBulkCopy I can load it in about 1 hour.
Thanks in advance,
G.
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Apr 24, 2007
I have deveoped a replacement for some an old bcp based applications in the .Net Framework that uses the SqlBulkCopy class.
I have run into some difficulties with code page translation:
The original BCP client runs with OEM Codepage 437 , thus the data "ëÄÆòÖ" gets loaded as "d-¦=+". DB is SQL_Latin1_General_CP1_CI_AS, column is varchar.
I have been unable to perform any code page Encoding in .Net that yields the same result.
I want to emulate this behaviour in my database loader but as yet have been able to find a way....
Any Ideas???
Thanks,
Niall
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Nov 19, 2007
I have the following table:
create table tTest
(
x varchar(20) COLLATE SQL_Latin1_General_CP1_CI_AS
)
I need to populate this table using SqlBulkCopy, however some symbols are inserted with mistakes.
Here is an example of the code that I€™m using:
using (SqlBulkCopy copier = new SqlBulkCopy(ci.ConnectionString))
{
copier.DestinationTableName = "tTest";
DataTable tbl = new DataTable();
tbl.Columns.Add(new DataColumn("x"));
tbl.Rows.Add(new object[] { "u00fc" }); //letter ü
copier.WriteToServer(tbl);
}
At the same time DTS and the statement
insert tTest values(N'ü')
works correctly.
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Feb 25, 2004
Hi
The system tables syslocks,syslockinfo give information on locked resources, spid, object_id,lock mode, lock status etc.
How will i get object_name
for example if a table is being locked above sys tables give object id, how can i get the actual table name ( object_name)
Please let me know
Best Regards
THNQdigital
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Oct 3, 2007
I have a Sql Express Database that I want to access from a remote tablet application. When the remote user accesses a record (which is a form + ink), I can't have anyone else accessing that record and drawing ink on the record's form, unitl the first user is done. How do I prevent access to that record in a user friendly way until the remote user is done and has updated his changes to the database?
thanks!
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