SQL Server Error:
If you're trying to run check database integrity with command "DBCC CHECKDB" with
REPAIR_ALLOW_DATA_LOSS, you will receive below error.
DBCC CHECKDB(N'Database Name',REPAIR_ALLOW_DATA_LOSS)
Msg 7919, Level 16, State 3, Line 1
Repair statement not processed. Database needs to be in single user mode.
If the database is in MULTI_USER mode, SQL Server will not allow you to run DBCC CHECKDB command with REPAIR_ALLOW_DATA_LOSS option. However you can run the DBCC CHECKDB command with this option. In order to fix page error and run this command you need to set database in SINGLE_USER mode.
You can below command to set the database into SINGLE_USER mode.
ALTER DATABASE [Database Name] SET SINGLE_USER
Once your database is set into single user mode, you can run checkDB command with REPAIR_ALLOW_DATA_LOSS option.
Note: If you are fixing this issue in production environment make sure to perform this activity in the maintenance window.