DOCUMENT:Q181798 02-APR-1999 [exchange] TITLE :XADM: Online Restore May Not Replay Log Files PRODUCT :Microsoft Exchange PROD/VER:WINDOWS:4.0,5.0,5.5 OPER/SYS: KEYWORDS:kbusage ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Exchange Server, versions 4.0, 5.0, 5.5 ------------------------------------------------------------------------------- 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 : kbusage Technology : kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2 Version : WINDOWS:4.0,5.0,5.5 Issue type : kbprb ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.