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Starting SQL Server in Single-User Mode

Under certain circumstances, 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.
ms188236.note(en-US,SQL.90).gifNote:
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.

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