SQL Server 2014 database restore singular phenomenon

Use a library to restore B library

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1. Perform a restore of the B library in use, modify the database name when restoring, and restore an error, prompting the database for use. Delete B library, still hints are being used, feel like zombies

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1. Restart SQL SERVER, because B library has been deleted, click the Restore button on the a library, but in the dialogue to change the target library name to B, the miracle came, B library restore success, a library but permanently into the restore state

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1. With RECOVERY, the database can expand the view data, but there may be Special , it's a good idea to restart SQL Server

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SQL Server 2014 database restore singular phenomenon