| In several exchange database operations, like (but | | | | Mailbox Store." |
| not limited to) backup process, the operating | | | | On exploring the application event log, it shows |
| system is called to read database pages that | | | | error -1018. |
| have to be written on disk. During this operation, | | | | Cause |
| the checksum value placed in database page | | | | The root cause of the above behavior is |
| header is compared with that returned by the | | | | corruption of Exchange mailbox store, most likely |
| READ operation. The backup operation fails if | | | | due to hardware issues. These errors cause |
| these values do not match. Such errors indicate | | | | checksum errors in database pages. |
| corruption in database and need backup availability | | | | Solution |
| to restore lost data. But in cases when user finds | | | | To resolve the problem: |
| it unfeasible to restore from backup (because it is | | | | 1. You need to run system hardware diagnostics |
| corrupted or incomplete), a Microsoft Exchange | | | | to find the root cause and then isolate the related |
| Recovery tool can help. | | | | issues. |
| To depict the probable events, let's take a related | | | | 2. User can create a new mailbox store and |
| scenario of an Exchange Server 2003 user. When | | | | move the mailboxes from the corrupted store, to |
| he runs a backup utility to copy the Exchange | | | | correct the database problems. |
| database, the operation halts with an error that | | | | 3. You can also try repairing the corrupted |
| reads: | | | | database using Eseutil/p repair utility. However, |
| "Database was not found and could not be | | | | this command is often unrecommended because |
| backed up. Please make sure database exists and | | | | it deletes the corrupted database pages and can |
| is mounted." | | | | cause important data to delete. |
| The logs also consist of errors such as: | | | | 4. And, for safe database repair, use an Exchange |
| "Store_Name is a corrupt file. This file cannot | | | | Recovery Tool. Designed to run safe scanning |
| verify." | | | | procedures, these Microsoft Exchange Server |
| Or | | | | Recovery software can repair corrupted |
| "Access is denied. Access denied to database | | | | database and extract valuable data. |