Handling corruption in an Exchange server mailbox database is the worst nightmare for any Exchange administrator. In the event of Exchange database corruption, the Exchange services fail to start and all the business comes to a standstill. In such circumstances, the first step should be to identify the corrupt file. If the pub.edb file is corrupt, all data present in the public folders on the Exchange Server would become inaccessible. These folders are often replicated to other servers in the same site. In this case, you can get all your data back by first rehousing them onto a functional server and then replicating these to the original server after bringing back the server online. If your priv.edb file is corrupt, the information stored in individual mailboxes will be lost. To recover this information, you need to go for Exchange recovery through a reliable tool.
Suppose, while using MS Exchange Server, you may occasionally see a similar error in your Application log:
Information Store (5824) First Storage Group: A bad page link (error -327) has been detected in a B-Tree (ObjectId: 622, PgnoRoot: 611) of database E:\Program Files\Exchsrvr\mdbdata\priv1.edb (703841 => 703830, 703607).”
This issue may crop up due to various hardware problems or an antivirus scan on the Exchange database file directory. The primary reasons responsible for the above error are discussed below:
- Inconsistent logs were committed to the database during Exchange database restoration.
- Faulty hard drive controller of Exchange Server.
- The database log files have been accidentally removed.
To work around the problem, you can try creating a new store, move the corrupt mailbox to this store, and then verify it. If this method fails, you can try running ‘isinteg -fix‘ or performing a hard repair.
Hard Repair Process for Corrupt Exchange Database:
- Execute Eseutil /p command.
- Run defragmentation Eseutil /d utility to create a new physical database structure and transfer all existing mailboxes data to it.
- Run consistency checker Isinteg –fix for the database until it returns no errors.
The best solution is to restore from the most recent backup. If all the above resolutions don’t work out, you should take help of professional Exchange Server recovery software. These software embrace highly safe and dedicated mechanisms to restore corrupt or damaged Exchange Server user mailboxes. They perform a close EDB recovery to extract precious user emails, contacts, appointments, notes, tasks, journals, etc.