Communication Between SQL Server Database And Application.

Jan 15, 2008



Hello.
I have my database and client application. I want my application to know (and to do certain things) when something has happened to a database (for example a row has been inserted). By means of what can it be done??I hope this forum is right place to ask such questions. Thanks for replies!

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Restore Of Database Via Veritas 9.1 Fails With Communication Error

May 24, 2006

We are running SQL 2000 sp4, only one user database (SAP) the database is 63 GB.
The ldf files were trashed so I went to tape to restore.
We are using veritas backup exec 9.1 sp4. Veritas is on the same server. I can restore the master db and the msdb fine. However when we attempt to restore the DEV db it runs for 2 hours and then fails with a communication error from veritas.
When we restore the master the DEV db comes up suspect as there are no files for it to attach to) so we cannot attach to it to restore, so I have deleted it and attempted to restore - same communication error. I have recreated a db named DEV with the mdf etc created to the size needed plus some to be sure, no good same behavior (behavior described below).
The job starts and it creates all the folders for the database (there are 1 MDF, 5 NDF, and 4 LDF files each in its own folder). Then it begins to create teh individual files it gets ~half way through at about an hour-hour and fifteen. During this time there are a large number of writes being performed by SQL (I assume it is creating the structures). Then it switches over to reading from tape a large number of read by beengine for another 45-1.5 hours then the job fails with the error unable to communicate with the device. I ahve noticed that once it starts reading from tape the db is gone from enterprise manager, and the mdf etc. files that were being created are now gone.

Help this has gone on for three days!!!

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Communication Link Failure When Connecting To Remote Database

Jan 28, 2008

Hi,

I have an SSIS package which runs subsequent packages in a batch. When I run the main package through command line or a SQL job and connect to a data warehouse that is on the same machine, it runs without a problem. When I try and connect to a warehouse on a remote machine (ideal configuration), it fails with this error:

Error: SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occurred. Error code: 0x80004005. An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80004005 Description: "Communication link failure". An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80004005 Description: "Communication link failure". An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80004005 Description: "TCP Provider: An existing connection was forcibly closed by the remote host. ".


This seems to happen on random subpackages and isn't always consistent.


My Master.dts.Config file has this connection info:

<Configuration ConfiguredType="Property" Path="Package.Connections[Batch].Properties[ConnectionString]" ValueType="String">
<ConfiguredValue>Data Source=RemoteServerName;Initial Catalog=DataWarehouse;Provider=SQLNCLI.1;Integrated Security=SSPI;</ConfiguredValue>
</Configuration>


Both machines have 64-bit operating system and 64-bit SQL software.

Any help would be great.

Thanks.

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Aug 15, 2006

Hi Guys,

I am using C++ (Ver 6) that connects to a SQL Server 7 DB using ODBC drivers. The apps connects to the database in the start and listens to the users requests and replies with the required data.

The apps is working fine, but once in a while it looses connection and gives "Communication link failure" message.

I just restart the apps and it is able to reconnect and perform as normal without any problems.

I am not able to find the reason as this behaviour as its very much unpredictable!

The error is returned by SQLExecDirect() function.

The question is, since I still have the Connection Handle, is it possible to just reconnect to the database re-using the same handle ? or do I have any other choices ?

Thanks in advance.
Faisal.

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Apr 3, 2008

Hi,
I am having a problem connecting my .net applications from the application server to the database server. When I run the application from my windows xp (sp2) box it works fine. When I try to connect via SQL Management Studio to the database server from the application server I get the same error.
Here is the error:
System.Data.SqlClient.SqlException: An error has occurred while establishing a connection to the server.  When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
 Here is the Environment:
App Server:
Windows Server 2003 Standard Edition
Inside Company's Firewall/ Network
Database Server:
Windows Server 2000 Advanced Edition
SQL Server 2000 SP4
Remote Connections to the Server is checked
Enable Protocols: Named Pipes & TCP/IP
TCP/IP Port: 1402 (I don't know why it isn't the default of 1433)
The db server is sitting out side the Company's firewall (don't ask me why). I can access it fine from inside the firewall on my XP box but not from windows server 2003. There is a web server outside the our network that also connects to the db server with no problem and that is running Windows Server 2003 Web Edition.
I can ping the db server from the app server using the IP address.
I tried using the IP address and the port 1402 in my connection string but that didn't work from any machine (XP and Server).
I imagine the issue is somehow related to the company's firewall but why would it only block Windows Server 2003 and not XP?
What do I tell the network admin to change?
Any help would be appreciated.
Thanks,
Oran
 

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hi

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actually i want to know should i know the settings & properties of my host that support SQL Server, or without know them i can devekop my apploication and after developing localy with just a few tasks upload my ( Sql Server) database?????

i'm worry actually about this, plz say what you know about this.
thanks

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Sep 1, 2004

Okay-- if anyone can solve this they are truly the SQL genius! We are getting this error when we run a VB program that we use to access an SQL database on a server across our network on a workstation. In fact we get this same error when we even run the program on the server where the SQL database is running or on any of our workstations. Here is the error message:

08501:[Micorsoft][odbc sql server driver] communications link failure

Now the odd thing is that many other functions in the workstation application work fine and retrieve data from SQL but certain data requests by the workstation application fail with the above error message and we get this message consistently. Even though it appears that different workstations running the identical Vb application will get this error consistently but in different locations when running the application. We were running SQL 6.5 on an old server, with the workstation application for literally years without any problems. We also decided to upgrade to a new server, installed server 2000 operating system and the latest version of SQl -- moved all the databases pointed the workstations odbc at this new server and get exactly the same error in the same location in the workstation applications. The programmer that wrote the application and designed the database in SQL can't find the problem and a number of other computer "experts" also could not find the error. We did add a new linksys DSL router/firewall but everything kept working after this installation for several weeks so I don't know if this is the problem on the network. THe programmer also noted that he had problems using terminal services on our network to connect to his office computer and decided that there must be some network issues that are causing the ODBC communicaitions to fail and also terminal services to fail-- or of course they may be unrelated. Has anyone ever seen this ODBC communication error in their travels through SQL implementations? Any help will be greatly appreciated. If we can't fix this we will have to abandon a software application that has been used for over five years and just too complex to rewrite.

Jeff Kilpatrick

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Apr 21, 2008



Hi all,

I think I can do this, just want to check

Can I have an sql server database (mdf file) on a server and allow windows applications at different site manipulate the database.

As far as I am concerned the only thing that needs to be configued is the connection string..is this correct.

[i would rather use windows applications rather than asp pages]

If I can, the best way to manipulate the database is to use stored procedures. How would I do the following to create and execute the following proposed procedure:

Insert data into a table
Update another table as a result

Execute the store procedure on a form to execute these two statements

Thanks in advance

Peter

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Dec 5, 2005

 Server Error in '/' Application.


Database 'C:INETPUBDEMO.TRUTHSTONE.COMAPP_DATAASPNETDB.MDF' cannot be upgraded because it is read-only or has read-only files. Make the database or files writeable, and rerun recovery.Cannot open user default database. Login failed.Login failed for user 'NT AUTHORITYNETWORK SERVICE'.
Hi,
Strange one.  I have copied my working web-site to the production server and get this message.
Tried copying new set of database files and reset the server to ensure no applications could be accessing the database files.  Still get the same error.
Works fine on my Visual Studio VWD Express version.
 
Mitch
PS I am not trying to upgrade the database, just use it!
 

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Sep 13, 2006

I have been programming an application with VC++ 2005 and SQL Server 2005. I have converted an old 16-bit database to 32-bit managed code and SQL server and the application seems to be good. Now I want to deploy the application to another server for testing.

I have installed XP SP2, Windows Installer 3.1, Net framework 2.0 and SQL Server 2005 express to the test server. I have transferred the application with WI 3.1 and the program works well in the test server till the first SQL command. I have made a back up of the database and restored it in the test server. In the test server I can log in the database with Server Management studio and I can read the data there correctly. I have enabled both named pipes and TCP/IP for the database in the test server. With Surface Area Configuration I have enabled Local and Remote Connections Using both TCP/IP and named pipes. I only need Windows authentication at this time.

After all this when I come to the first SQL command in the application on the test server I receive the error message:
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 €“ Could not open a connection to SQL Server).

My connection string to the database is:
'connection->ConnectionString = "Persist Security Info=False; Integrated Security =SSPI;"
"Data Source=TESTSERVER; Initial Catalog=TESTDATABASE;";'

When I use "Data Source=DevelopmentServer", the application works well on the development server.

Can't understand what is still wrong. Can you possibly have an answer for me?

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[Microsoft][ODBC SQL Server Driver]Communication Link Failure

Aug 29, 2002

All,
I need a help from you all. I am getting this error if the users are running the application which is connecting from MSAccess97 to SQL Server 2000.
Error: [Microsoft][ODBC SQL Server Driver]Communication link failure
I would appreciate if you send me the resolution for this problem.
Thanks,
Reddy

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My connection string is as below.

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Please help.

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Nov 27, 2007

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These messages started in the last two weeks.


Thanks for any direction that can be thrown my way.

David

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Hi,
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Please help if you can.
 
Thanks,
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May 1, 2008

Hello, we have the hosting account with GoDaddy Server. We have using Visualstudio.net and MSSSQL Server 2005.
For hosting the files for the remote server ( Godaddy ) we are using FTP Cute client to upload the files. For Uploading a database they given a seperate login and we are hosted my data as a Transact SQL File. Up to this its going fine.
       After that I want to retrieve my data from GoDaddy Database server. They are not allow the remote connections directly. But they told to use the File DSN to retrieve the data from thier server ( GoDaddy Server ). I don't Know how to use thier File DSN to connect My ASP.Net 2.0 Application to thier GoDaddy Database Server. 
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Mar 28, 2007

Hi!

I have setup a database mirroring session without witness - ServerA is the principal, ServerB is the mirror,. Each SQL Server instance is hosted on its own machine on sql2005 EE SP2. The mirroring is working correctly. If I submit to server ServerA command:

ALTER DATABASE MYDBNAME SET PARTNER FAILOVER

, ServerB becomes the principal, it means that mirroring works correctly.

My issue is with the SQL Native Client and a front-end ASP application (actually IIS 6.0 site) that needs to make use of this database. I have setup my front-end application to use SQL Native Client and specified the failover server in connection string. Here is the connection string that I am using :

PROVIDER=SQLNCLI.1;Server=ServerA,1433;Failover Partner=ServerB,1433;Database=MYDBNAME;Network=dbmssocn;Integrated Security=SSPI;

Everything works perfectly on my front-end application when ServerA is the principal. If I execute on server ServerA command:

ALTER DATABASE MYDBNAME SET PARTNER FAILOVER

, ServerB becomes the principal, and the failover occurs correctly on the database side. The problem is that my front-end application is not able to query the database on ServerB. The error appears:

Microsoft SQL Native Client error '80004005'

Cannot open database "MYDBNAME" requested by the login. The login failed.

This behavior my appication till I unload IIS 6.0 pool application. After that my front-end application becomes work correctly with ServerB.

When I swap server, I execute on server ServerB command:

ALTER DATABASE MYDBNAME SET PARTNER FAILOVER,

my IIS 6.0 application automaticly turn back to ServerA without any action on my side.

I am using SQL Native Client last version http://download.microsoft.com/download/2/7/c/27c60d49-6dbe-423e-9a9e-1c873f269484/sqlncli.msi (issued in February 2007). Has anyone experienced this issue? I'm thinking that it's a problem in the SQL Native client

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Apr 21, 2008

Hi All,

I am new to MS SQL SERVER 2005.
My web application using SQL Server 2005 as back end database to store all the information.
I am using connection pooling to get connection form db.
But my fron end user( user who logged in into webapplication) lost his identity b'coz for database user is application server.
Now I wanna to track front end user in db.

In oracle I can do it by using CLIENT_IDENTIFIER. But in sql server I don't know how to do it.

in oracle i can do it as below
public void setIdentity(Connection conn, String identity) {
PreparedStatement ps;
try {
ps =
conn.prepareCall("begin dbms_session.set_identifier(?); end;");
ps.setString(1, identity);
ps.execute();
ps.close();
} catch (SQLException e) {
// Handle the exception
}
}
<!--[if !supportLineBreakNewLine]-->
once the transaction is complete, the application should reset the identity as follows:

public void clearIdentity(Connection conn) {
PreparedStatement ps;
try {
ps = conn.prepareCall("begin dbms_session.clear_identifier(); end;");
ps.execute();
ps.close();
} catch (SQLException e) {
// Handle the exception
}
}
<!--[if !supportLineBreakNewLine]-->
Please guide me for same.

Thanx in advance.

Bhadu<!--[endif]-->

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Mar 4, 2008

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connection.Open()
 saying "Communication with the underlying transaction manager has failed", "System.Transactions.TransactionManagerCommunicationException was unhandled by user code". And the web browser displays the following error "Error HRESULT E_FAIL has been returned from a call to a COM component".     When I try to connect the SQL Server 2005 with the same ConnectionString attributes by going to Tools>Connect to Database, it works fine. But, through application connection.Open() giving above errors.     I have set the MSDTC properties (i.e., under Component Services>MyComputer Properties>Security Configuration) as below:-Enabled Network DTC Access, Allow Remote Clients, Allow Remote Administration, Allow Inbound, Allow Outbound, No Authentication required - selected, Enabled XA Transactions...& DTC Logon Account is "NT AUTHORITYNetworkService".Please help.Thanks in advance,Chandra 

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Dec 10, 2005

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Can someone provide with code as I am new to this architecture and framework.
Better send email.
Thanks In Advance,
A New Bie

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Jan 13, 2007

Here is the situation:

I have SQL server express 2005 installed on my pc as instance SQLEXPRESS.

I have created a Visual Basic applicaion with the following as connection to the SQL server express 2005 running on the same PC:
****************************************************************************************************
Dim lconnectionString As String Dim builder As New SqlConnectionStringBuilder Dim cmd As New SqlCommand Dim reader As SqlDataReader Dim parameter As SqlParameter builder("Data Source") = ".SQLEXPRESS" builder("Initial Catalog") = "" builder("AttachDbFilename") = "C:My DocumentsVisual Studio 2005Projectsabcabcabc.mdf" builder("Integrated Security") = True builder("User Instance") = True lconnectionString = builder.ConnectionString Dim sqlConnection1 As New SqlConnection(lconnectionString) cmd.CommandText = "SP_add_collection" cmd.CommandType = CommandType.StoredProcedure cmd.Connection = sqlConnection1 sqlConnection1.Open()
*******************************************************************************************************************

It seems that i can not connect to the abc.mdf in SSMSE while the VB program is running. (ERROR:
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I want to be able to access the abc.mdf database with both SSMSE and VB at the same time. Could anyone help me on this ?

Thanks very much !

apple

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Jan 21, 2008

Hi there

I am new to SQL Server, but the current project that I am working on has the following requirement:-

1) Migrate the application (a servlet based web application on Apache Tomcat) from Solaris to Wintel
2) Migrate the supporting database from SQL Server 2000 to Sql Server 2005
3) Get IIS to communicate with Tomcat for serving servlet/jsp etc to the client

Though I successfully completed item 1 above, am stuck at item 2. Details are below

Actions taken for item 2

A. Installed MS 2005
B. Created new database in MS 2005 (logged in as user 'sa')
C. Generated SQL scripts (such as create table table_A etc) from existing MS 2000
D. Genearted SQL scripts (such as insert into table_A etc) from existing MS 2000
E. Created new schema in MS 2005
F. Ran scripts C & D in the new schema. All tables are records populated.
G. Obtained new JDBC driver and test run to see if connection is working fine, and it worked. Even ran an sql statment


Code Block[select count(*) from sa.table_A]

and got appropriate response.


H. When I made the application to talk to this new database (which is a copy of Production from step C, D above), it's behaving as though it cannot find the record.
I. When I further debugged, I realised that the web application is excuting queries without mentioning the schema. For eg.



Code Block[Select firstName, lastName from table_A]

Or rather it assumes that the user connecting to database is same as the schema name.


J. To further ascertain my point, I ran the query


Code Block[Select firstName, lastName from sa.table_A]

and it worked!



Now the real problem is that I cannot modify the existing code to append a schema name and this approach is rather not recommended best practise.


I tried to match the user name with the schema name, even made this schema as default to the user. But still not finding any luck.

I request all you experts out there to help me out with this problem.

Regards,

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Feb 18, 2006

Hi,

I am using VS2005 C# + sql server 2005 Express edition.

I need to using a database that uses my own defined data types to define its tables columns.

I already have designed a Database projact and create the new UDT as follows:



Create a new Database project in the Visual C# language nodes.


Add a reference to the SQL Server 2005 database that will contain the UDT.


Add a User-Defined Type class.


Write code to implement the UDT.


Select Deploy from the Build menu.

Now I need to ask some quistions:

1- When I try to add a new query to a table that contains my new data type in its columns,if I try to exexute the query the next message appears:

'Execution of user code in the .Net framework is disabled. Enable "clr enabled" configuration option'.

How can I doing that??

2- I need to use that database - which has the new data type - in a traditional ' Visual C# Windows Application' instead of 'Database', but:

when I try to add a new Data Source that contains the tables that have the new data types in its definitions, the next message appears:

'<AyaDatabase.dbo.MyNewUDTTable>

User-defined types(UDTs)are not supported in the Dataset Designer.'

So, how can I resolve that problem??

please help me.

Thanks in advance for any help.

Aya.



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; 08S01

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Dec 19, 2006



I have client machine in one domain, say A domain , on which I have installed .net 2.0 without any problem. I have report server running in other domain (B domain) where I have deployed few models which will be used from domain A to create ad hoc reports by launching Report Builder. I can access other reports in domain B from A

But when I click on Report Builder ..it tries to connect to server in domain B but fails to connect and shows following log in a text pop up

I know, problem is because of cross domain communication but question is then how to fix it ? what changes I need to do for that in firewall, domain etc etc settings?

Here is the error, I have highlighted lines which might give some clue:

------------------------------------------------------------------------------------------

PLATFORM VERSION INFO
Windows : 5.2.3790.65536 (Win32NT)
Common Language Runtime : 2.0.50727.42
System.Deployment.dll : 2.0.50727.42 (RTM.050727-4200)
mscorwks.dll : 2.0.50727.42 (RTM.050727-4200)
dfdll.dll : 2.0.50727.42 (RTM.050727-4200)
dfshim.dll : 2.0.50727.42 (RTM.050727-4200)

SOURCES
Deployment url : http://192.168.1.197/ReportServer/ReportBuilder/ReportBuilder.application

ERROR SUMMARY
Below is a summary of the errors, details of these errors are listed later in the log.
* Activation of http://192.168.1.197/ReportServer/ReportBuilder/ReportBuilder.application resulted in exception. Following failure messages were detected:
+ Downloading http://192.168.1.197/ReportServer/ReportBuilder/ReportBuilder.application did not succeed.
+ The remote server returned an error: (500) Internal Server Error.

COMPONENT STORE TRANSACTION FAILURE SUMMARY
No transaction error was detected.

WARNINGS
There were no warnings during this operation.

OPERATION PROGRESS STATUS
* [12/19/2006 6:49:58 AM] : Activation of http://192.168.1.197/ReportServer/ReportBuilder/ReportBuilder.application has started.

ERROR DETAILS
Following errors were detected during this operation.
* [12/19/2006 6:50:14 AM] System.Deployment.Application.DeploymentDownloadException (Unknown subtype)
- Downloading http://192.168.1.197/ReportServer/ReportBuilder/ReportBuilder.application did not succeed.
- Source: System.Deployment
- Stack trace:
at System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)
at System.Deployment.Application.SystemNetDownloader.DownloadAllFiles()
at System.Deployment.Application.FileDownloader.Download(SubscriptionState subState)
at System.Deployment.Application.DownloadManager.DownloadManifestAsRawFile(Uri& sourceUri, String targetPath, IDownloadNotification notification, DownloadOptions options, ServerInformation& serverInformation)
at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestDirectBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options, ServerInformation& serverInformation)
at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options)
at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(Uri activationUri, Boolean isShortcut)
at System.Deployment.Application.ApplicationActivator.ActivateDeploymentWorker(Object state)
--- Inner Exception ---
System.Net.WebException
- The remote server returned an error: (500) Internal Server Error.
- Source: System
- Stack trace:
at System.Net.HttpWebRequest.GetResponse()
at System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)

COMPONENT STORE TRANSACTION DETAILS
No transaction information is available.

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