SQL SERVER-Exclusive access could not be obtained because the database is in use. (Microsoft.SqlServer.SmoExtended)

Q:先在一个实例中恢复一个数据A，然后又想在恢复一次，取别名为A2，这是报异常SQL SERVER-Exclusive access could not be obtained because the database is in use. (Microsoft.SqlServer.SmoExtended)

A：先将A offline，然后恢复A2，完成后在bring online。