如何正确分离MSSQL数据库

Question

I am trying to copy a MDF file using PowerShell. 我正在尝试使用PowerShell复制MDF文件。

I take the DB offline and detach it using this SQL (based on Detach local database .mdf, copy, attach the new file ): 我使数据库脱机并使用此SQL分离它（基于Detach本地数据库.mdf，复制并附加新文件）：

USE MASTER;
ALTER DATABASE mydatabase SET OFFLINE WITH ROLLBACK IMMEDIATE;
EXEC sp_detach_db 'mydatabase'

This sometimes gives the following error: 有时会出现以下错误：

Invoke-Sqlcmd : Cannot detach the database'mydatabase' because it is currently in use. Invoke-Sqlcmd：无法分离数据库“ mydatabase”，因为它当前正在使用中。

How to properly detach the database? 如何正确分离数据库？

Answer 1

Solution is to close outstanding connections to the database by setting it to SINGLE_USER mode: 解决方案是通过将数据库设置为SINGLE_USER模式来关闭与数据库的未完成连接：

USE master;  
ALTER DATABASE mydatabase
SET SINGLE_USER
WITH ROLLBACK IMMEDIATE;
GO

As described here: 如此处所述：