Starting SQL Server in Single-User Mode

For some actions you may have to start an instance of Microsoft SQL Server in single-user mode by using the startup option ** -m**.

For example, you may want to change server configuration options or recover a damaged master database or other system database. Both actions require starting an instance of SQL Server in single-user mode.

When you start an instance of SQL Server in single-user mode, note the following:

• Only one user can connect to the server.
• The CHECKPOINT process is not executed. By default, it is executed automatically at startup.

Note: 
Stop the SQL Server Agent service before connecting to an instance of SQL Server in single-user mode; otherwise, the SQL Server Agent service uses the connection, thereby blocking it. 

See Also

• Starting SQL Server in Single-User Mode

Other Languages

This article is also available in the following languages: 

Japonês (ja-JP)

• SQL Server をシングルユーザーモードで起動する方法 (ja-JP)

Brazilian Portuguese (pt-BR)

• Iniciando o SQL Server em Single-User Mode (pt-BR)