[Fixed] SQL Error 945 | Database Cannot Be Opened due to Inaccessible Files

"Cannot open database "[database name]" requested by the login. The login failed. For more information, see SQL Server Error Log. (Microsoft SQL Server, Error: 945)"

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What is SQL Error 945?

SQL Server error 945 occurs when the database is marked as "IsShutdown," or when the attachment and detachment of the MDF file was not completed properly, preventing the recovery process from bringing the database to a consistent state.

It can happen for any of several different reasons:

• Disproportionate storage consumption by memory-optimized tables
• Failed SQL database repair due to missing files
• Use of a corrupted backup
• Abnormal database shutdown
• Malware attack

There are six solutions to try when you encounter the SQL Server error 945.

How to Fix SQL Error 945 in 6 Ways: Database Cannot Be Opened Due to Inaccessible File, Insufficient Memory, or Lack of Disk Space

Based on user experiences, there are effective solutions for the SQL Server error 945 - Database cannot be opened due to inaccessible files. Firstly, you can try restarting your SQL database using the ALTER DATABASE query. This query will assist in setting the SQL Server database to an online state. If that doesn't work, you can attempt the following methods.

Fix 1: Increase the hard drive space

As the error message indicates, a SQL database might fail to open due to insufficient disk space. Deleting unnecessary files on the hard drive or adding a larger one can potentially resolve SQL Server Error 945. If you're concerned about data loss, you can back up your hard drive with free backup software before deletion.

Fix 2: Ensure Auto Increment is Enabled

Since the database needs to be set to Auto Increment, you'll need to check and ensure that this option is enabled. Here's how you can enable it:

< strong > Step 1. Open SQL Server Management Studio and connect to the problematic database.

Step 2: Click View > Object Explorer.

Step 3: Expand the Database folder.

Step 5: Under Select Page, choose Files, locate the Auto Increment setting, and check the Enable Auto Increment option.

Fix 3: Check Account Permissions

Please check the account you're using and make sure it has the proper permissions to perform the operation.

Fix 4: Check the MDF/NDF Files of the Database

If the MDF or NDF file of the database is marked as read-only, you may encounter SQL error 945. Therefore, make sure that the MDF and NDF files are not shown as read-only. To remove the read-only attribute from an MDF or NDF file:

Step 1: Locate your database's .mdf or .ndf file, right-click on it, and choose “Properties” > “Security.” You will see a list of “Groups or Users.”

Step 2. Select the user you want to grant file access to and check the corresponding permissions.

If the permission is not "Full Control," click "Edit" to change it.

Step 4: You should then see a “Group” or “User Name” field. Select the user and check “Full Control.”

Fix 5: Utilize an SQL Database Repair Tool This suggestion involves using a specialized SQL database repair tool to address issues related to your database. These tools typically scan for and fix errors within the database, helping to restore data integrity and normal functioning. When dealing with a damaged or non-functional database, consider employing such software. Make sure to choose a reputable tool that is compatible with the specific type of database you are using.

Check the error logs to find out the reason behind the database corruption. If it is due to continuous I/O errors related to the application programming interface, torn pages, or any other hardware issue, you can resolve it by restoring the database from a backup. If you don't have a backup available, you can use a professional MS SQL repair tool like the MS SQL Recovery Tool to fix your SQL database.

• Repair corrupted SQL database files (MDF/NDF)
• Repair corrupted SQL Server database components - Tables, Triggers, Indexes, Keys, Rules, and Stored Procedures
• Recover deleted/erased records from SQL databases

Let's see how to use it to fix your database:

Step 1: Stop the MS SQL Server service

Press Windows + R, then type services.msc.

Locate and double-click SQL Server (INSTANCENAME).

In the Properties window, click Stop to stop SQL Server, and then click Apply to confirm.

Step 2: Run the SQL Repair Tool. On the main interface, click on “Browse” (two dots) to select the corrupted MDF/NDF file. Then, click on “Repair” to start analyzing your MDF/NDF file.

If you know where the file is located, click Browse to locate the database.

If you do not know the location, click Search to search for the .mdf and .ndf files.

Step 3: Once the scan is complete, all the database objects will be displayed on the left pane. Select the database object that you need to repair and click on 'Export'.

Step 4: Choose how to export your database data: "Export to Database" or "Export as SQL script." If you choose "Export to Database," you will need to provide server information, log in to your account, and select the target database, which can be a new or existing one.

Step 5: You must now restart SQL Server before clicking OK.

Press the "Windows key + R" and type services.msc.

Locate and double-click SQL Server (Instance Name).

In the Properties window, click Start to restart the SQL Server service, and then click OK to confirm.

Step 6: Click on 'OK' to save the repaired file to the SQL database of your choice.

Fix 6: Try the DBCC CHECKDB repair options

If you don't have a backup, you can try to use DBCC CHECKDB with repair options. However, this is not recommended as it may put your SQL database into Suspect mode, causing another SQL Server error 926. (Learn more about SQL database errors.)

Get things done

We delved into one of the most common SQL Server issues, Error 945, which occurs when a database fails to open due to inaccessible files or insufficient memory or disk space. We discussed possible causes and solutions, suggesting manual methods to fix SQL Server Error 945, such as expanding hard disk space, checking account permissions, examining the database files, and attempting to use DBCC CHECKDB.

For a simpler solution, you can try SQL Repair Tool that provides the easiest way to repair corrupted (.mdf and .ndf) files, fix database log files, and restore damaged objects.

For more information: How to Fix SQL Server Error 926

Similar to SQL error 945, SQL error 926 may also occur due to an incorrect connection with SQL Server or while using the RESTORE DATABASE or RESTORE LOG process, displaying the error message, "The database cannot be opened. It is marked RESTORE pending or is in the middle of being restored." You can try the following methods to resolve this issue.

1. Run DBCC CHECKDB: Review the error report and address issues based on provided solutions. 2. Restore from a database backup: If you have a backup available, recover the database using that. 3. Consult the error log: If you're unable to restore the SQL database from a backup, try reaching out to primary support or examine the SQL Server error log for further assistance.