We have a production database with a SQL Server 2012 Mirroring scheme with three machines: Principal, Mirror, Witness.
The mirroring was configured with a certificate that had only one year of expiry date. Now, the certificate is expired and the mirroring has failed. The Principal and Mirror machines are both with the database status Disconnected and the Mirror is also with "In Recovery" status.
They basically suggest that I have to create new certificates and alter the Endpoint. My issue is how to safely resume the mirroring since the machines are disconnected for over a week. If I use
ALTER DATABASE [mirrored_database_name] SET PARTNER RESUME, the Mirror machine will need A LOT of time to sync ALL information that was change in a week.
Will the Principal database be unavailable at this syncing or be with a bad performance? Or should I create a new mirroring session from the scratch? (i.e.: creating a new Full backup and Transaction Log backup for the Mirror machine)