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Resolve SQL Server Error 5123 Using Simple Methods

Shubham Dixit   
Published: Jun 28, 2023 • Repair • 5 Minutes Reading

SQL Server Error 5123 is a common error that occurs when trying to attach a database file to a SQL Server instance. This error indicates that the user does not have the necessary permissions to access the specified database file. It can be frustrating to encounter this error, especially when you are trying to work on an important project.

However, there are several ways to resolve this error, and in this article, we will discuss the causes and solutions for SQL Server Error 5123.

sql server error 5123

What We Have Discussed in this Post

  1. The causes of the error occurred.
  2. Quick solution to fix the issue.
  3. Manual way to resolve Error 5123.
  4. Error Fixed using an effective tool.

What Are the Causes of SQL Server Error 5123?

The primary cause of this error is a lack of necessary permissions to access the database file. Some of the reasons could be:

  • When the user does not have the appropriate permissions to access the database file.
  • If the database file is already in use by another user, SQL Server will not be able to access it and will throw this error.
  • The user has a corrupted or damaged database file; SQL Server may not be able to access it and will throw Error 5123.

We need to add permission as the owner of the .mdf and .ldf files in order to fix this issue.

Quick Tricks to Resolve the SQL Error 5123

The quick solutions depend on the cause of the error. Here are some common solutions:

  • Ensure that the user has the appropriate permissions to access the database file. To do this, right-click the database file > Properties, and navigate to the Security tab. Ensure that the user has the necessary permissions listed.
  • Close all other connections to the file if any DB is in use by another account before attempting to access it.
  • If the cause of the error is a corrupted database file, you can attempt to repair the file using SQL Server Management Studio or other database management tools. This process involves restoring the file from a backup or running the DBCC CHECKDB command to check for and repair any errors.

Manually Fix Error 5123 Attaching DB

Follow these steps to solve SQL server error 5123 access denied issue.

  1. Right-click on the database file and select “Properties“.
  2. In the “Security” tab, click on “Edit”.
  3. Click on “Add” to add a new user account.
  4. Enter the name of the user account that needs permission to access the database file.
  5. Select the necessary permissions (e.g., “Full Control”) for the user account and click on “OK”.

Moreover, you can perform this for an associated .ldf file and again try to attach it. Also, You can also try “Run as Administrator” rather than granting permission to everyone.

Attaching Database in MS SQL Server Using (SSMS)

Here, you may view every database file that is associated with the SQL instance.

  1. Use SQL Server Management Studio (SSMS) to establish a connection to the SQL Server Database Engine instance. Open the Object Explorer and SSMS.
  2. In the Object Explorer, open the “Databases” folder. Select “Attach” from the context menu of the “Databases” folder.
  3. After selecting the database file, click the “Add” button to attach it.
  4. Verify the database information and file locations again.
  5. Assign the required rights to the database. Click “OK” to attach the database.
  6. It’s over! By following these steps, you may easily attach a database to your SQL Server instance using SQL Server Management Studio. Automated Solution.

Automated Tool for Resolving SQL Server Error 5123

Users can attempt the professional tool if any of the aforementioned fixes for SQL Server issues are ineffective. In addition to helping to fix SQL server issue 5123, SQL database Recovery Software assists in recovering corrupt.mdf and.ndf SQL server database files.

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Without erasing any data, the software restores deleted or corrupted records from database tables. You can easily export recovered NDF database files into a SQL Server database.

1. Download the utility and launch it to resolve the SQL server error 5123 access denied issue.

resolving sql server error 5123

2. Then add MDF or NDF files using the Open option.

adding NDF & MDF files

3. Choose the Advance Scan and Version option and mark Recover Deleted to get the deleted database files.

applying scanning options

4. Preview the recovered data items and files. Now, hit the Export button.

previewing the recovered items

5. in the next window, press the Export button to recover the damaged or corrupted data and fix the issue SQL server error 5123 access denied.

fix sql server error 5123

Also Read: How to Restore Database from MDF and NDF File in SQL Server?


SQL Server Error 5123 can be frustrating to encounter, but it is not insurmountable. By checking permissions, closing other connections, and repairing the database file. Other than this one can use the above-mentioned manual solution to solve the SQL server-based error. You can resolve this error and regain access to your database. If you continue to encounter this error or experience data loss, it may be helpful to seek assistance from a database administrator or IT professional.