Here is a quick simple command you can run to view what Public Folder Database your Mailbox Databases are pointing to in Exchange 2010.

Get-MailboxDatabase  | Sort-Object PublicFolderDatabase |  Ft Name, PublicFolderDatabase


This will give you an output like below

Name                                              PublicFolderDatabase
—-                                                        ——————–
DB1                                                    01-PF
DB2                                                   01-PF
DB3                                                   02-PF
DB4                                                   02-PF
DB5                                                   03-PF