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: 
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