Microsoft sql server ошибка 3415

SQL error 3415 occurs while attaching a database to an SQL server. It normally happens due to insufficient permission of the user or SQL server version conflicts.

As a part of our Server Management Services, we help our Customers to fix SQL related errors regularly.

Let us today discuss the possible causes and fixes for this error.

What causes SQL error 3415?

Users often face the SQL error 3415  while attaching a database to the SQL server. A typical error message looks like:

Major reasons for this error are:

1. The user does not have sufficient permission to the MSSQL data folder.
2. The database is in read-only mode.
3. Version conflict of SQL Servers.

Let us now look at each of these reasons and their solutions one by one.
 

How to fix the SQL error 3415?

The most common reason for error 3415 is that the user under which the SQL service runs does not have full access permissions to MSSQL data folder. To fix this error, we need to grant proper permission to the user using the steps below:

1. Go to the MSSQL data folder and right-click on it.
2.Select Properties.
3. Go to the Security tab.
*If the "Log On As" user from your service is a user account, make sure that user account has Full Control for the folder.
*If the "Log On As" user from your service is "Network Service" or "Local System" those accounts should already have access.

The database is in read-only mode

While we attach the database to a higher version of SQL Server than the instance the .mdf was originally attached to, it triggers the error. SQL Server tries to upgrade the database as part of the attachment, but it cannot as the database is in read-only mode.

SQL Server does not detect the read-only filegroup before it starts to upgrade the database. After the upgrade has started, SQL Server writes entries to the transaction log. Earlier versions cannot read the new transaction log entries.

To fix the error, we will need to move the database that contains a read-only filegroup to an instance of the new SQL Server version. A detailed procedure to perform this is available here.

Alternate Solutions

If the error message appears even after having proper permissions and the database is not read-only, it could be related to SQL Server Management Studio. Starting the SQL Server Management Studio in Administrator mode may help to fix the error message.

Another alternate fix for this error is to restore a backup of the database from the old instance to the new instance. Since the conflict with the versions in the two servers is a major reason for this error, performing an upgrade of the earlier version of SQL Server to a higher version of SQL Server would also help to fix it.

Further, retrying after changing the locations of MDF and LDF files may also help to fix the issue. Also, we need to make sure that the account jas the required privileges.

 
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Conclusion

In short, SQL error 3415 occurs while attaching a database to an SQL server. It normally happens due to insufficient permission of the user or SQL server version conflicts. Today, we saw how our Support Engineers fix this error.

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While trying to attach a database in SQL Server, you may receive the error 3415. When the error 3415 in SQL Server occurs, you may receive an error message similar to the below one:

Error 3415, Severity 16

Database Adventureworks is read-only or has read-only files and must be made writable before it can be upgraded.

As you can see, this error has a severity of 16, which means that the user can fix the problem.

When this problem occurs?

To understand the issue, we can try to reproduce the problem. For this, we can detach a database from one server by opening the SSMS and then going to Tasks > Detach.

• Then, we can try to attach the database to a folder that doesn’t have enough permissions.

Alternatively, we can use the T-SQL commands to detach the database (see the below example).

USE [master]
GO
EXEC master.dbo.sp_detach_db @dbname = N’Database_name’
GO

Now, we will try to attach the database. For this, we can use the sp_attach_db stored procedure.

USE [master]
GO
EXEC sp_attach_db @dbname = N’db1′,
@FILENAME1 = N’C:\Program Files\Microsoft SQL Server\MSSQL16.MSSQLSERVER03\MSSQL\DATA\DB1.mdf’,
@FILENAME2 = N’C:\Program Files\Microsoft SQL Server\MSSQL16.MSSQLSERVER03\MSSQL\DATA\DB1_log.ldf’;

Alternatively, we can attach the database using the CREATE DATABASE command (see the below example).

USE [master]
GO
CREATE DATABASE [db1] ON
( FILENAME = N’C:\Program Files\Microsoft SQL Server\MSSQL16.MSSQLSERVER03\MSSQL\DATA\DB1.mdf’ ),
( FILENAME = N’C:\Program Files\Microsoft SQL Server\MSSQL16.MSSQLSERVER03\MSSQL\DATA\DB1_log.ldf’ )
FOR ATTACH
GO

How to Resolve the Error 3415 in SQL Server?

Here are some solutions you can try to resolve the error.

Check Privileges in the SQL Server Service Account

SQL Server runs under the SQL Server Service account. The SQL Server Service is a program that executes SQL Server Database Engine. This service runs under a Windows user account. Sometimes, this account does not have enough permissions to manipulate the SQL Server data and log files.

The data files contain the SQL Server database information, whereas the log files contain the transaction information.

• To check the folder where the data files and log files are installed, right-click the database and select properties.

• Select the Files page and look for the Path. It will show the path of the log and data files.

• To check the account used by the SQL Server, go to the Windows Start menu and select Microsoft SQL Server > SQL Server Configuration Manager.

• In the SQL Server Configuration Manager, go to SQL Server Services and double-click the SQL Server service.

• We can see the Account name. We can change it to another account by using the browse button.

• If we change the account name, we need to restart the service.

• After knowing the account, in the properties, go to the folder with the data files. Right-click the folder and select Properties.

• In Properties, go to the Security tab and select Edit.

• In the Permission for Data window, press the Add button to add the service name account, if it is not included. Once added, assign the permissions to the folder.

Run SSMS as Administrator

Sometimes, the problem occurs if we’re not running the SSMS (SQL Server Management Studio) as an administrator. To solve this, right-click the SSMS icon and select the Run as administrator option.

What to do if the data file is damaged?

When the data file is damaged, you may fail to attach the database. In such a case, you can use a third-party software, such as Stellar Repair for MS SQL to fix the problem. This software can repair the database file in just a few clicks. Then, you would be able to attach the database without error.

Conclusion

In this article, we have explained how to fix the SQL Server error 3415. This error usually occurs when there are not enough permissions in the SQL Server service to access the data file and transaction log folders. The error may also occur if the user is not running the SSMS as an administrator. To fix the problem, you can grant permissions to the folder and run SSMS as administrator. If the database file is corrupt, you can repair the file by using a professional SQL repair tool, such as Stellar Repair for MS SQL.