Failed to enable MDB %1 (GUID = %2) because its search index was in an unknown status (%3). Reset the index files by running the command ResetSearchIndex.ps1 in the Exchange Management Shell.

Details
Product: Exchange
Event ID: 112
Source: MSExchange Search Indexer
Version: 8.0
Symbolic Name: SearchIndexUnknownStatus
Message: Failed to enable MDB %1 (GUID = %2) because its search index was in an unknown status (%3). Reset the index files by running the command ResetSearchIndex.ps1 in the Exchange Management Shell.
   
Explanation

This Error event indicates that the Microsoft Exchange Search service did not enable the specified mailbox database because its catalog has an unknown status (mentioned in the event description). The catalog or index files are located in the same directory as the mailbox database. The problem might occur when the index files are corrupted. Because of this error, online mode search may take a long time to return results for users who have mailboxes on the affected mailbox database.

   
User Action

To resolve this error, do one or more of the following:

  • Delete the index files by running the following script from the Exchange Management Shell and let Exchange Search rebuild the index files for the mailbox database. Follow these steps:

    1. Open Exchange Management Shell and locate the script directory under the Exchange server installation root directory (for example: \Program Files\Microsoft\Exchange Server\Scripts).

    2. Type this command: ResetSearchIndex.msh -force <dbname>

      For example:

      [PS] D:\Program Files\Microsoft\Exchange Server\Scripts\ResetSearchIndex.msh -force “Mailbox Database”

      Note   The <dbname> would be the name of the affected mailbox database for which you are resetting the index files. The parameter -force will reset the index files without asking for a confirmation. After several minutes, Exchange Search will re-create the index files for the mailbox database.

  • Get additional help by posting the issue at Newsgroups: Exchange Server and Outlook.

  • If the issue persists, contact Microsoft Product Support Services. For more information, visit the Contact Us page of the Microsoft Help and Support Web site.

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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