%1 (%2) %3The database engine lost one or more bad columns of data in one record. It is highly recommended that an application-level integrity check of the database be run to ensure application-level data integrity.

Details
Product: Exchange
Event ID: 502
Source: ESE
Version: 8.0
Symbolic Name: REPAIR_BAD_COLUMN_ID
Message: %1 (%2) %3The database engine lost one or more bad columns of data in one record. It is highly recommended that an application-level integrity check of the database be run to ensure application-level data integrity.
   
Explanation

This Warning event indicates that a database repair operation with eseutil /p has caused some columns in the ESE database to be damaged for a particular record.

Eseutil could not completely repair some data and the data was discarded.

   
User Action

To resolve this warning, run eseutil /d to defragment the database and rebuild the indexes. Then, run isinteg -fix to restore referential integrity.

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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