Set a Database to Single-user Mode
Applies To: SQL Server 2016
This topic describes how to set a user-defined database to single-user mode in SQL Server 2016 by using SQL Server Management Studio or Transact-SQL. Single-user mode specifies that only one user at a time can access the database and is generally used for maintenance actions.
In This Topic
Before you begin:
To set a database to single-user mode, using:
If other users are connected to the database at the time that you set the database to single-user mode, their connections to the database will be closed without warning.
The database remains in single-user mode even if the user that set the option logs off. At that point, a different user, but only one, can connect to the database.
- Before you set the database to SINGLE_USER, verify that the AUTO_UPDATE_STATISTICS_ASYNC option is set to OFF. When this option is set to ON, the background thread that is used to update statistics takes a connection against the database, and you will be unable to access the database in single-user mode. For more information, see ALTER DATABASE SET Options (Transact-SQL).
Requires ALTER permission on the database.
In Object Explorer, connect to an instance of the SQL Server Database Engine, and then expand that instance.
Right-click the database to change, and then click Properties.
In the Database Properties dialog box, click the Options page.
From the Restrict Access option, select Single.
If other users are connected to the database, an Open Connections message will appear. To change the property and close all other connections, click Yes.
You can also set the database to Multiple or Restricted access by using this procedure. For more information about the Restrict Access options, see Database Properties (Options Page).
Connect to the Database Engine.
From the Standard bar, click New Query.
Copy and paste the following example into the query window and click Execute. This example sets the database to
SINGLE_USERmode to obtain exclusive access. The example then sets the state of the AdventureWorks2012 database to
READ_ONLYand returns access to the database to all users.The termination option
WITH ROLLBACK IMMEDIATEis specified in the first
ALTER DATABASEstatement. This will cause all incomplete transactions to be rolled back and any other connections to the AdventureWorks2012 database to be immediately disconnected.
USE master; GO ALTER DATABASE AdventureWorks2012 SET SINGLE_USER WITH ROLLBACK IMMEDIATE; GO ALTER DATABASE AdventureWorks2012 SET READ_ONLY; GO ALTER DATABASE AdventureWorks2012 SET MULTI_USER; GO