Rename and Move an Exchange Mailbox Database

To rename the default database running the following command:
[PS] C:/>Set-Mailbox "Mailbox Database 12453789" -Name "MailBoxDB-2"


Move the database files:
[PS] C:/> Move-DatabasePath -Name "MailBoxDB-2" -EdbFilePath "D:/MailBoxDB/MailBoxDB-2/MailBoxDB-2.edb" -LogFolderPath "E:/MailBoxDBLogs/MailBoxDB-2"