从不同数据库备份/还原导致无法获得还原失败的独占访问权限

I have a database A. I have taken a backup of database A called A.bak. I created a new database B. Now, I right click and Restore B from A.bak. In the Restore Dialog, I checked overwrite existing database and change the LogicalFileName from I have a database A. I have taken a backup of d