Microsoft KB Archive/181798

= XADM: Online Restore May Not Replay Log Files =

Article ID: 181798

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition
 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q181798



SYMPTOMS
When you are restoring a database created during an online backup, the log files may not replay into the database being restored if the circular logging status has been changed from disabled to enabled.



CAUSE
In the following scenario, the log files will not be replayed:


 * 1) Circular logging is enabled.
 * 2) An online backup is made of the information store or directory.
 * 3) Circular logging is disabled.
 * 4) A restore of the information store or directory is made to the server.

Log files created after circular logging is disabled cannot be replayed into a database created when circular logging was enabled. In most cases, there will be a gap in the logfile sequence, and messages cannot be recovered from logs residing on the drive.



WORKAROUND
When circular logging is disabled, you must immediately perform a backup of the information store and directory to be able to restore a database and replay the log files that will begin to be created after circular logging is disabled.

Keywords: kbprb kbusage KB181798

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