Note
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Access to this page requires authorization. You can try changing directories.
Applies to: 
SQL Server on Windows
Use the repair operation in the following scenarios:
Repair an instance of SQL Server that becomes corrupted after a successful installation.
Repair an instance of SQL Server if the upgrade operation is canceled or fails after the instance name is mapped to the newly upgraded instance.
If you see the following message in the summary log, you can repair the failed upgrade instance:
SQL Server upgrade failed. To continue, investigate the reason for the failure, correct the problem, and then repair your installation.
If you see the following message in the summary log, you need to uninstall and reinstall SQL Server. You can't repair the SQL Server instance.
SQL Server upgrade failed. To continue, investigate the reason for the failure, correct the problem.
Note
To repair SQL Server Express edition, you need the offline installer. Run the SQL Server Express edition installation and select the Download Media option. Use the downloaded executable to run SQL Server Setup in place of setup.exe.
Repair a SQL Server instance
When you repair an instance of SQL Server:
- All missing or corrupt files are replaced.
- All missing or corrupt registry keys are replaced.
- All missing or invalid configuration values are set to default values.
Before you continue, for SQL Server failover clusters, review the following important information:
Repair must be run on individual cluster nodes.
To repair a failover cluster node after a failed Prepare operation, use Remove node and then perform the Prepare step again. For more information, see Add or remove nodes in a failover cluster instance (Setup).
Repair a failed installation of SQL Server from the Installation Center
Launch the SQL Server Setup program (
setup.exe) from SQL Server installation media.After prerequisites and system verification, the Setup program displays the SQL Server Installation Center page.
Select Maintenance in the left-hand navigation area, and then select Repair to start the repair operation.
Tip
If you use the Start menu to launch the Installation Center, you need to provide the location of the installation media at this time.
Setup support rule and file routines run to ensure that your system has prerequisites installed and that the computer passes Setup validation rules. Select OK or Install to continue.
On the Select Instance page, select the instance to repair, and then select Next to continue.
The repair rules run to validate the operation. To continue, select Next.
The Ready to Repair page indicates that the operation is ready to proceed. To continue, select Repair.
The Repair Progress page shows the status of the repair operation. The Complete page indicates that the operation is finished.
Repair a failed installation of SQL Server using the command prompt
Run the following command at a command prompt. Replace <instancename> with the name of the instance you want to repair.
setup.exe /q /ACTION=Repair /INSTANCENAME=<instancename>