| Exchange data fragmentation occurs within the | | | | When you try to perform soft database |
| database. To reduce its effect, Exchange Server | | | | recovery, you get an error message, as below: |
| includes a default defragmentation process (called | | | | “Checking database integrity.Operation |
| online defragmentation) on daily basis as a part of | | | | terminated with error -1206 |
| regular maintenance process. Also, the application | | | | (JET_errDatabaseCorrupted, Non-database file or |
| provides an offline defrafgmentation technique, | | | | corrupted db) after n seconds” |
| which is accomplished by eseutil /d command. | | | | The database is inaccessible . |
| Both of these methods discard the unused space, | | | | Cause |
| but occasionally introduce some database errors | | | | The EDB file is severely corrupted and cannot be |
| that cause database to corrupt. To repair such | | | | mounted. |
| corrupted databases, you need to apply eseutil | | | | Solution |
| repair commands or restore from the last | | | | You can try to implement the following |
| available backup. However, if these measures | | | | suggestions to solve the described issue: |
| don't help, you should repair the corrupted | | | | 1.Restore from the last backup you have. |
| database using an Exchange Recovery tool. | | | | 2.If the soft recovery has failed, you can use |
| For instance, consider the following practical | | | | hard recovery command- eseutil /r. Make sure |
| scenario. You try to defragment the Exchange | | | | you backup the file first. It is the hard command |
| database (*.edb) with eseutil /d command, but the | | | | and usually deletes the corrupted pages that it |
| process fails while it is defragmenting the | | | | cannot understand. |
| database. After this, you observe that the file in | | | | 3.If the above solutions are not valid, you should |
| effect is named as *.edb.edb. You rename it to | | | | use a third-party database repair utility. Such |
| *.edb, but Exchange Server refuses to mount it | | | | software can easily repair a corrupted EDB file |
| further. | | | | without harming the original integrity of the file. |