Can't restore a database from a backup if MCDB is enabled in Exchange Server 2019
Symptoms
Assume that you enable Metacache Database (MCDB) on Microsoft Exchange Server 2019 Mailbox servers. When you try to restore a mailbox database to a recovery storage group, the database does not mount even though it shows a healthy shutdown state.
Cause
MCDB becomes linked to the primary database when the database is backed up. Because those links expire by the time that the database is restored, we must break those links to make the database mount.
Resolution
To fix this issue, run ESEutil on the database by using the following commands:
Eseutil /r E01 /d "E:\Databases\RDB1" /i
This example shows a log generation prefix of E01 and a recovery database path of E:\Databases\RDB1.
More information
MCDB is a new feature in Exchange Server 2019 that enables solid state drives to cache the most frequently used data from a database. For more information, see MetaCacheDatabase (MCDB) setup.
For detailed steps about how to recover a database, see Restore data using a recovery database
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