Logical corruption in Microsoft Exchange Server database (EDB) file is far more problematic and difficult to identify and repair than the physical damage.
Microsoft Exchange Server does not provide any inbuilt tool to diagnose the logical corruption of EDB database.
Moreover, there are no specific symptoms to identify the logical corruption of database. In case the EDB database is affected by logical corruption, the EDB database becomes inaccessible and you face acute data loss situation.
Let’s consider a real life scenario wherein when you attempt to access the data from the Exchange Server, you come across the following entries in the Application Event log:
Event ID: 42
Description: MSExchangeIS ((###)) The database engine found a bad page.
The aforementioned entries in the Application Event log symbolize logical corruption of Exchange Server database files.
After restoring the database, just in case you replay the wrong transaction log files, logical corruption of Exchange Server database takes place.
As a matter of fact, the “bad page link” or JET_errBadPageLink errors symbolize or indicate the logical corruption of Exchange Server database.
In order to overcome this situation, you need to perform Exchange recovery.
Now let’s see what all you can do to resolve the aforementioned issue. A lot can be done to resolve the aforementioned issue.
First and foremost, try to restore Exchange Server database from the last, valid, and clean backup. However, in case of unavailability of a valid backup or just in case you are unable to restore Exchange Server database from a valid backup, use the exmerge.exe tool to export the data.
If the above-mentioned does not work, then use the “Move Mailbox” feature in Exchange Administrator program for moving users from damaged Exchange Server to another one. Now, recreate priv.edb file on the original Exchange Server and then move users back to the original Exchange Server.
However, if nothing works then use a professional and proficient restore Exchange tool to repair the damaged and corrupt Exchange database.
Exchange Server recovery is a professional, comprehensive, and result-oriented restore Exchange tool that is specifically devised to repair Exchange Server database (EDB) files.