Best Practice - Run From .mdf File Or SQLExpress?

Dec 24, 2007



Hi I was just wondering what is more efficient/safer/easier/better to use a database file (.mdf) or SQLExpress. I am writing a program that will heavily rely on the database (its a stock management system)

I was just wondering though which is better, because I could easily create a database file and deploy it with the application it's just the user has access to it that way, also a user not sure what that file is could just delete it and you obviously know the consequences of that.

I also have code that creates and writes to the users SQL Server using .SQLExpress instead of a filename, but my only objection to this method is I dont know enough about security, integrity etc to trust this method also if a user uninstalls the program will it automatically delete the database created?

Well thanks for any help given, it will be greatly appreciated.

Also if you have an alternative route that would be great to

Thanks

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Convert A SQLExpress File Based DB Project To SQLExpress Server DB Project

Jul 1, 2006

Hi All,I've been struggling with this for hours...Could someone please advise me on how to convert my current File based SQL Server Express website to a Server based SQL Express one.Particularly interested in what I need to do in the SQL Express management tool, changes I need to make the projecvt itself and changes needed to get IIS to understand things have been changed.Thanks,Martin.

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Mar 1, 2007



Here is my idea but I am looking for the best practice.

Each record can have 3 possibilites.

I would read and write the data 3 times to different tables and add an identity key on all 3 files then I would reassembe the data back together on the identity key and map the data to a fourth and final table.

Any other ideas?



Thanks,

Larry

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OverWrite SqlExpress .LDF File ???

May 20, 2006

Hi :)
I have a website that uses SqlExpress ...on it i have a database that was working ok ...until i made a few modifications to the database (had a few rows).
I have upload the database (only the .mdf file) to the app_data folder ...but now i get this message :
One or more files do not match the primary file of the database. If you are attempting to attach a database, retry the operation with the correct files.  If this is an existing database, the file may be corrupted and should be restored from a backup.Cannot open database "ArtWork" requested by the login. The login failed.Login failed for user 'NT AUTHORITYNETWORK SERVICE'.Log file 'c:xxxxxxxxxxxxxxxxxxxApp_DataArtWork_log.LDF' does not match the primary file.  It may be from a different database or the log may have been rebuilt previously.
I try to delete the .LDF file but it gives me access denied ...i cheched the permissions for the file and everything is ok
How can i solve this??
Thanks and Cheers

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SQLExpress Database File Auto-creation Error:

Jun 12, 2006

i am using sql2005, the data inserted into the database by using createuserwizrd. after that anyone give me this error
anyone ? any thought? thanks please
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: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) 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. SQLExpress database file auto-creation error:
The connection string specifies a local Sql Server Express instance using a database location within the applications App_Data directory. The provider attempted to automatically create the application services database because the provider determined that the database does not exist. The following configuration requirements are necessary to successfully check for existence of the application services database and automatically create the application services database:

If the applications App_Data directory does not already exist, the web server account must have read and write access to the applications directory. This is necessary because the web server account will automatically create the App_Data directory if it does not already exist.
If the applications App_Data directory already exists, the web server account only requires read and write access to the applications App_Data directory. This is necessary because the web server account will attempt to verify that the Sql Server Express database already exists within the applications App_Data directory. Revoking read access on the App_Data directory from the web server account will prevent the provider from correctly determining if the Sql Server Express database already exists. This will cause an error when the provider attempts to create a duplicate of an already existing database. Write access is required because the web server accounts credentials are used when creating the new database.
Sql Server Express must be installed on the machine.
The process identity for the web server account must have a local user profile. See the readme document for details on how to create a local user profile for both machine and domain accounts.

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SQLExpress Database File Auto-creation Erro...........Im Lost!

Mar 28, 2008

here is my error message wich can also be seen live at www.aspdoug.com/menu  log in with  user: doug  pass: macromedia!
--------------------------------------------------------------------------------------------------------------------------------
Server Error in '/menu' Application.


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: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) 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. SQLExpress database file auto-creation error:
The connection string specifies a local Sql Server Express instance using a database location within the applications App_Data directory. The provider attempted to automatically create the application services database because the provider determined that the database does not exist. The following configuration requirements are necessary to successfully check for existence of the application services database and automatically create the application services database:

If the applications App_Data directory does not already exist, the web server account must have read and write access to the applications directory. This is necessary because the web server account will automatically create the App_Data directory if it does not already exist.
If the applications App_Data directory already exists, the web server account only requires read and write access to the applications App_Data directory. This is necessary because the web server account will attempt to verify that the Sql Server Express database already exists within the applications App_Data directory. Revoking read access on the App_Data directory from the web server account will prevent the provider from correctly determining if the Sql Server Express database already exists. This will cause an error when the provider attempts to create a duplicate of an already existing database. Write access is required because the web server accounts credentials are used when creating the new database.
Sql Server Express must be installed on the machine.
The process identity for the web server account must have a local user profile. See the readme document for details on how to create a local user profile for both machine and domain accounts.
Source Error:



An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace:



[SqlException (0x80131904): 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: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +800131
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +186
System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) +737554
System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) +114
System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) +421
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +181
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +173
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +133
System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) +27
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +47
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
System.Data.SqlClient.SqlConnection.Open() +111
System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) +68

[HttpException (0x80004005): Unable to connect to SQL Server database.]
System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) +124
System.Web.Management.SqlServices.SetupApplicationServices(String server, String user, String password, Boolean trusted, String connectionString, String database, String dbFileName, SqlFeatures features, Boolean install) +86
System.Web.Management.SqlServices.Install(String database, String dbFileName, String connectionString) +25
System.Web.DataAccess.SqlConnectionHelper.CreateMdfFile(String fullFileName, String dataDir, String connectionString) +397



Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433
 
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Below is my web.config file.
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------<?xml version="1.0"?><configuration>
 
 <appSettings/>
<connectionStrings>
<add name="aspdougcomConnectionString" connectionString="Data Source=65.36.214.248;Initial Catalog=aspdougcom;Persist Security Info=True;User ID=*&^%$#@;Password=*&^%$#@"providerName="System.Data.SqlClient" /></connectionStrings>
 
<system.web><!--
Set compilation debug="true" to insert debugging
symbols into the compiled page. Because this
affects performance, set this value to true only
during development.
Visual Basic options:
Set strict="true" to disallow all data type conversions
where data loss can occur.
Set explicit="true" to force declaration of all variables.-->
<compilation debug="false" strict="false" explicit="true"></compilation>
<pages><namespaces>
<clear /><add namespace="System" />
<add namespace="System.Collections" /><add namespace="System.Collections.Generic" />
<add namespace="System.Collections.Specialized" /><add namespace="System.Configuration" />
<add namespace="System.Text" /><add namespace="System.Text.RegularExpressions" />
<add namespace="System.Web" /><add namespace="System.Web.Caching" />
<add namespace="System.Web.SessionState" /><add namespace="System.Web.Security" />
<add namespace="System.Web.Profile" /><add namespace="System.Web.UI" />
<add namespace="System.Web.UI.WebControls" /><add namespace="System.Web.UI.WebControls.WebParts" />
<add namespace="System.Web.UI.HtmlControls" /></namespaces>
</pages>
<!--
The <authentication> section enables configuration
of the security authentication mode used by
ASP.NET to identify an incoming user. -->
<authentication mode="Forms" />
<!--
The <customErrors> section enables configuration
of what to do if/when an unhandled error occurs
during the execution of a request. Specifically,
it enables developers to configure html error pages
to be displayed in place of a error stack trace.
<customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
<error statusCode="403" redirect="NoAccess.htm" />
<error statusCode="404" redirect="FileNotFound.htm" />
</customErrors>-->
 </system.web>
</configuration>
 
-------------------------------------------------------------------------------------------------------------------------
MY host told me that they do not support sqlexpress and to change it MySql 2005 or something. im using hostmysite.com builder plan.

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srv = New Server("MYPCSQLEXPRESS")

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Dim bdi As New BackupDeviceItem(BackupFileName, DeviceType.File)

Dim recoverymod As RecoveryModel

recoverymod = db.DatabaseOptions.RecoveryModel

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rs.Database = "washmaster"

rs.ReplaceDatabase = True

srv.KillAllProcesses("washmaster")

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This works great as long as I used one of the backup files that I created directly on the disk. However, my application has a utility that allows the user to copy the backup files onto another drive, such as a CD or a thumb drive and when I try to restore from the copy of the backup, I get the following exception:

....Cannot open backup device..[filename]...Operating system error 5(Access is denied.)

The reason I get this error is that the "NETWORK SERVICE" account was removed from the file permissions when the file was copied.

How can I copy a backup to another drive and preserve the "NETWORK SERVICE" account? If I can't do that, is it wise to try to add the account back to the file before using it to restore or is there a better way?

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(Terms)
TermID, Term
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and
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1 ------ 3
1------ 2
2------ 4


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Do you run your DB's on redundant haardware w/ a 3rd party
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regards
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Jan 11, 2006

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Nov 2, 2006

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I tried but it didnt work!
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Aug 7, 2007

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Hello All ..
This is the scenario I'm having :
-- I'm a beginner so bear the way I'm putting it ... sorry !

* I have a database with tables
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- Supplier: SupplierID, SupplierCode, SupplierName, CompanyID (fk)

In the Stored Procedures associated (insertCompany, insertPerson, insertSupplier), I want to check the existance of SupplierID .. which should be the 'Output' ...

There could be different ways to do it like:
1) - In the supplier stored procedure I can read the ID (SELECT) and :

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------------------------------------
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3) it could be done (maybe) using Functions in SQL SERVER...

There should be some reasons why I need to go for one of the methods or another method !
I want to know the best practice for this scenario in terms of performance and other issues - consider a similar big scenario ..... !!!

I'll appreciate your help ...
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Jan 16, 2008

Need the following question addressed, as it keeps coming up in our development meetings and has been creating a divide. Pease voice your opinion.

To keep it simple, we have Table1 which identifies several questions that are revised on a regular basis. One of it's columns is called "Revision Status". Within revision Status, we would like to identify the possible status of a question such as:

New Questions;
Revised;
Resubmit;
Inactive;
Active;

...as well as several more.

I'm of the mind to have these in a seperate table identified with a unique ID... call it StatusTable.

Such as:

1 New Questions;
2 Revised;
3 Resubmit;
4 Inactive;
5 Active;

However others feel, just use the "Revision Status" column and simply use the numbers "WITHOUT" a table or description. The developer documentation will tell the developer which number equals the description. ie the following would be found in the Revision Status column.

1
2
3
4
5


My mind says the above is ilogical. I would rather join and say in my statement:

WHERE StatusTable.Status = 'Inactive'

Where the other way would be

Where [Revision Status] = 4


I hope i'm not being thick-headed.

Please advise.

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Jul 20, 2007



I'm looking for advice on the best way to stop stored procedures and CLR assemblies from being

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to another company.



Are there established ways for achieving this level of protection.



Also, I was hoping that encrypting stored procedures would be a 100% reliable way to stop

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SQL Server Best Practice With IIS

Aug 9, 2006

Hi Everyone

We are building a new site using ASP and SQL as the backend.
Any idea where I can find some information about best practices to coonect the 2.
I was thinking about IIS on a DMZ with port 80 only open and the SQL inside the internal network and open port 1443 between them.

Any ideas will be welcomed.

Thank you

Oren Levy

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