%1 (%2) Unable to purge transaction logs because at least one database (%3) is off-line.

Details
Product: Exchange
Event ID: 951
Source: ESE BACKUP
Version: 8.0
Symbolic Name: BACKUP_NOT_TRUNCATE_DB_UNMOUNTED_ID
Message: %1 (%2) Unable to purge transaction logs because at least one database (%3) is off-line.
   
Explanation

This Error event indicates that an error occurred when Exchange Server tried to delete the transaction log files associated with an online backup set. The reason that the transaction log files could not be deleted is because one or more Exchange database files were not online when the online backup operation started. All Exchange databases must be online for an online backup process to be completed successfully.

   
User Action

To resolve this error, use the information provided in the event to identify the database that was offline at the time that the online backup operation started. Use the Exchange Management Console to determine whether the database identified in the message is currently online. If the specified database is not online, bring it online. If the specified database is currently online, the database may have been temporarily offline when the online backup process started.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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